Contents
1999
Volume: 19 Issue 8
29 Article(s)
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Fiber Optics and Optical Communications
Simple FWM Evaluation and Novel Nonlinear Effect Simulation Method for WDM Optical Fiber Transmission Systems
[in Chinese], and [in Chinese]
In wavelength-division multiplexing (WDM) optical fiber communication systems, the signal quality after transmission can be severely impaired by self-phase modulation (SPM), cross-phase modulation (XPM) and four wave mixing (FWM) effects. A simple formula to estimate FWM effect is derived. Furthermore, during the nonliIn wavelength-division multiplexing (WDM) optical fiber communication systems, the signal quality after transmission can be severely impaired by self-phase modulation (SPM), cross-phase modulation (XPM) and four wave mixing (FWM) effects. A simple formula to estimate FWM effect is derived. Furthermore, during the nonlinearity simulation in WDM systems by single-channel method, a step-size formula is proposed to optimize between computing accuracy and speed. An alternative simulation method for GVD, SPM, XPM and FWM based on multiple-channel coupled-wave equations is also developed, resulting in significant decrease in computation workload..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1034 (1999)
Optimum Length Matching of Gradient-Index-Rod Lenses in Wavelength-Division Mulit/Demultiplexers
[in Chinese], and [in Chinese]
There are N+1 gradient-index-rod lenses (GRINs) in a 1×N wavelength division multi/demultiplexer, forming a 1-to-N collimating system. Excess coupling losses arise due to the varying separations between the GRINs. The lengths of the GRINs need to be properly chosen to achieve a lowest average coupling loss. NumeriThere are N+1 gradient-index-rod lenses (GRINs) in a 1×N wavelength division multi/demultiplexer, forming a 1-to-N collimating system. Excess coupling losses arise due to the varying separations between the GRINs. The lengths of the GRINs need to be properly chosen to achieve a lowest average coupling loss. Numerical results show that the input GRIN is ΔZ0 longer than quarter pitch with ΔZ0=20～50 μm, depending on N. There is an upper limit for ΔZ0. The lengths of N output GRINs are differently shorter (ΔZi<0) or longer (>0) than quarter pitch. ΔZi increases from negative to positive starting from the near end to the far end GRINs, also depending upon N. The optimized matching GRINs assure the lowest coupling loss at N≤8, especially negligible at N≤6..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1041 (1999)
An Improved WKB Method and Correction of Phase Shift
[in Chinese]
In accordance with the multilayer approach for analyzing graded-index waveguide, the WKB method is improved by correction of the phase shift term. Formulas for the improved WKB method and for calculation of phase shift are derived. Numerical results for typical refractive-index profiles (exponential, Gaussian, erfc, trIn accordance with the multilayer approach for analyzing graded-index waveguide, the WKB method is improved by correction of the phase shift term. Formulas for the improved WKB method and for calculation of phase shift are derived. Numerical results for typical refractive-index profiles (exponential, Gaussian, erfc, truncated linear) demonstrate that the present method is highly accurate up to near cut-off region..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1045 (1999)
Holography
A New Method of Local Thermal Fixing by CO2 Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A real-time and in-situ recording-fixing method after heating with CO2 laser beams is suggested to thermally fix a small local hologram in a bulk of Fe:LiNbO3 photorefractive crystal. With an insulator mantling the crystal, when two cw CO2 laser beams heat it to form a 200℃volume with the shape of Gauss beam, CO2 laserA real-time and in-situ recording-fixing method after heating with CO2 laser beams is suggested to thermally fix a small local hologram in a bulk of Fe:LiNbO3 photorefractive crystal. With an insulator mantling the crystal, when two cw CO2 laser beams heat it to form a 200℃volume with the shape of Gauss beam, CO2 laser beams are blocked and Ar+ laser beams are used to record a photorefrative hologram, finally fixed a hologram in crystal before the temperature descended to 100℃. A heat transfer model and numeric solution are given. On the basis of simulation, a series of experimental result are obtained. Both experiment and theory analysis show that this scheme can fix a better hologram in real time and in situ, the temperature distribution is uniform..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1065 (1999)
Study of the Holographic Storage Properties of In:Fe:LiNbO3 Crystal
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The In:Fe:LiNbO3 crystal has been grown by doping In2O3 and Fe2O3 into LiNbO3. The measurement results show that, the In:Fe:LiNbO3 crystal has high light scattering resistance, high response speed and long storage conservative time. The mechanism of this crystal behaving holographic storage properties is discussed. TheThe In:Fe:LiNbO3 crystal has been grown by doping In2O3 and Fe2O3 into LiNbO3. The measurement results show that, the In:Fe:LiNbO3 crystal has high light scattering resistance, high response speed and long storage conservative time. The mechanism of this crystal behaving holographic storage properties is discussed. The maximum value of the diffraction efficiency measured is 73%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1070 (1999)
A Neural Network-Based Approach for Invariant Recognition of 2-D Objects
[in Chinese], [in Chinese], and [in Chinese]
A neural network-based approach is proposed for invariant recognition of two-dimensional objects. The industrial tools to be recognized have one degree of freedom, the dynamic range of their shapes leads the feature vector not uniquely defined even for a single object. The Fourier descriptors of objects boundary are taA neural network-based approach is proposed for invariant recognition of two-dimensional objects. The industrial tools to be recognized have one degree of freedom, the dynamic range of their shapes leads the feature vector not uniquely defined even for a single object. The Fourier descriptors of objects boundary are taken as the features being invariant to translation, rotation and scale changes. A multilayer feedforward neural net with two hidden layer classifiers is utilized. The experimental studies involving four sorts of mechanical tools are carried out. The performance is compared to a nearest neighbor rule. It is shown that the approach is robust to not only noisy but also varying feature vector, and the neural network can recognize some untrained objects..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1074 (1999)
Instrumentation, Measurement and Metrology
The Measurement of Spatial Coherence of KrF Excimer Laser
[in Chinese], [in Chinese], and [in Chinese]
A kind of reversal shear interferometer has been designed to measure the temporal change of spatial coherence of KrF excimer laser with an unstable resonator. By this method, we can get the spatial coherence degree from a single measurement. At different shear distance, using slit and photodetector. The stepwise increaA kind of reversal shear interferometer has been designed to measure the temporal change of spatial coherence of KrF excimer laser with an unstable resonator. By this method, we can get the spatial coherence degree from a single measurement. At different shear distance, using slit and photodetector. The stepwise increase of the spatial coherence degree at intervals equal to the transit time of the resonator was observed. Moreover, the ray matrix has been used to analyze the propagation of partial coherent light and the coherence widths of successive passes are calculated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1094 (1999)
Copying Technique for Making 2D Master Rainbow Holograms Using Non-Coherent Light
[in Chinese], and [in Chinese]
A technique of making 2D rainbow master holograms for embossing using non-coherent light source is described.In master hologram recording process, an uv-lamp is used as the light source, and no optical elements and anti-vibration devices are required. The color encoding is realized by fringe replication from the “rainbA technique of making 2D rainbow master holograms for embossing using non-coherent light source is described.In master hologram recording process, an uv-lamp is used as the light source, and no optical elements and anti-vibration devices are required. The color encoding is realized by fringe replication from the “rainbow plates”, in which the slit images are recorded.The “rainbow plates” can be used for many times, so the recording process of master holograms is very simple. The technique has the advantages of low investment, high production efficiency and good hologram quality. Therefore it is valuable for hologram mass production..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1101 (1999)
Study of Laser Conditioning of Optical Coatings with Small Laser Spot Scanning
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Laser conditioning is a new technology to enhance laser damage threshold of the optical coatings. The method of the small laser spot scanning and raising of energy step by step is applied to condiation several various multi-layer reflective coatings. It is found experimentally that the damage thresholds of the reflectiLaser conditioning is a new technology to enhance laser damage threshold of the optical coatings. The method of the small laser spot scanning and raising of energy step by step is applied to condiation several various multi-layer reflective coatings. It is found experimentally that the damage thresholds of the reflection coatings, except of HfO2/MgF2 multi-layer coating, such as zero-probability damage threshold F0%, minimum damage energy density FDmin, maximum not damage energy density FNDmax and 50% probability damage threshold F50% are all enhanced. It means that laser conditioning technology not only can eliminate the impurities and defects in the coating, but also can improve the whole properties of the coating..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1105 (1999)
Research of Attenuated Phase-Shifting Mask and Its Encoding Making Method
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Attenuated phase shifting mask (PSM) and that with optical proximity correction are adopted to improve resolution of photolithography based on some calculation results. And a new method of making attenuated PSM by encoding is proposed, and the theoretical calculation results are accordant to that of the conventional atAttenuated phase shifting mask (PSM) and that with optical proximity correction are adopted to improve resolution of photolithography based on some calculation results. And a new method of making attenuated PSM by encoding is proposed, and the theoretical calculation results are accordant to that of the conventional attenuated mask..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1110 (1999)
Development of Soft X-Ray Spectrograph for Ultrashort Pulse Laser Produced Plasma Diagnosis
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel soft X-ray spectrograph comprised of a toroidal mirror image optics, a high-density transmission grating and a soft X-ray CCD camera has been developed. The detecting range is in the wavelength region from 0.5 nm to 15 nm with a resolution of about 0.05 nm. The spectrograph has no astigmatism. A point object isA novel soft X-ray spectrograph comprised of a toroidal mirror image optics, a high-density transmission grating and a soft X-ray CCD camera has been developed. The detecting range is in the wavelength region from 0.5 nm to 15 nm with a resolution of about 0.05 nm. The spectrograph has no astigmatism. A point object is imaged to a point. Owing to its high efficiency, even an X-ray spectrum of low-energy laser produced plasma can be measured. It is especially suitable for experiments of ultrashort femtosecond pulse laser produced plasmas..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1114 (1999)
Image Property of Polarized Confocal Scanning Microscopy
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The influence of vertical resolution and signal-noise-ratio (SNR) of confocal scanning microscopy (CSM) on three-dimention (3D) imaging ability is analyzed. The criterion for vertical resolution of CSM is given. A polarized CSM is designed to improve the SNR so as to obtain the microstructure of weak scattering object The influence of vertical resolution and signal-noise-ratio (SNR) of confocal scanning microscopy (CSM) on three-dimention (3D) imaging ability is analyzed. The criterion for vertical resolution of CSM is given. A polarized CSM is designed to improve the SNR so as to obtain the microstructure of weak scattering object or strong surface reflection object or polarized object..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1118 (1999)
Lasers and Laser Optics
Propagation of Two Laser Pulses in Three-Level Ladder System
[in Chinese], and [in Chinese]
Based on the coupled matrix-density equations and Maxwell equations and considered the transverse effect of the laser pulses, resonant propagation of two laser pulses in three-level ladder system was presented under the cylindrical symmetry. The evolutions of pulses propagating in thick absorbers were studied. The sponBased on the coupled matrix-density equations and Maxwell equations and considered the transverse effect of the laser pulses, resonant propagation of two laser pulses in three-level ladder system was presented under the cylindrical symmetry. The evolutions of pulses propagating in thick absorbers were studied. The spontaneous relaxation of upper levels is considered in numerical solutions. The calculation results show the evolution of pulse energy and the distribution of ionization particle..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1009 (1999)
Ionization Rates of Atoms in an Intense Optical Field
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The ionization rates of atom and atomic ions in an intense optical field are summarized systematically with the quasi-static approximation, on the basis of tunneling ionization theory in the static electric field. The error in the formula (13a) of reference [10] was modified. The ionization rates and threshold intensitThe ionization rates of atom and atomic ions in an intense optical field are summarized systematically with the quasi-static approximation, on the basis of tunneling ionization theory in the static electric field. The error in the formula (13a) of reference [10] was modified. The ionization rates and threshold intensities of Xe atom and ions in both intense circularly polarized and linearly polarized field are computed and compared..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1014 (1999)
Digital Analysis of Laser Induced Thermal Process in Optical Coatings
[in Chinese], [in Chinese], and [in Chinese]
The thermal process is an important process of interaction between laser and optical coating. The “alternate recessive algorithm” was applied to solve the equation of the heat transfers in multilayer optical coating. The two-dimension thermal field in coatings was obtained. Some examples to calculate the temperature fiThe thermal process is an important process of interaction between laser and optical coating. The “alternate recessive algorithm” was applied to solve the equation of the heat transfers in multilayer optical coating. The two-dimension thermal field in coatings was obtained. Some examples to calculate the temperature field in typical optical coatings were shown..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1019 (1999)
Numerical Simulation of the Multi-Segment Amplifier
[in Chinese], and [in Chinese]
Considering the transformation from stored energy of electric capacitors to that of the laser medium, and introducing the temporal factor and three-dimensional spatial amplified spontaneous emission (ASE), numerical calculations have been performed to simulate the characteristics of the multi-segment amplifier (MSA), iConsidering the transformation from stored energy of electric capacitors to that of the laser medium, and introducing the temporal factor and three-dimensional spatial amplified spontaneous emission (ASE), numerical calculations have been performed to simulate the characteristics of the multi-segment amplifier (MSA), including temporal changes in the pumping balance between central and side flashlamp arrays, stored energy, gain coefficient and gain distribution of the MSA. The present numerical codes have been verified with the experimental data of LLNL, demonstrating the ability of the predicted performance for the MSA..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1024 (1999)
Numerical Analysis of Dynamic Characteristic of Dual-Wavelength Femtosecond Lasers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Numerical method is used to study dynamic characteristics of dual-wavelength femtosecond lasers and finite difference is used to solve cross mode-locking equations. The results show that two trains of mode-locking pulses interact in two-beam laser cavity and under specific condition, i.e., group velocity dispersion, seNumerical method is used to study dynamic characteristics of dual-wavelength femtosecond lasers and finite difference is used to solve cross mode-locking equations. The results show that two trains of mode-locking pulses interact in two-beam laser cavity and under specific condition, i.e., group velocity dispersion, self-phase modulation, cross coupling, gain amplification and loss are balanced, laser can be cross mode-locked, so cross mode-locking femtosecond pulses can be generated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1030 (1999)
Optical System of an Imaging CO2 Laser Radar
[in Chinese]
According to the charecteristics of the backscattered light from the rough surfaces of the target far away and the random phase matching rule, the method of coherent optical head coefficients designing is discussed. An optical system is developed that is an optical head of a coherent imaging CO2 laser radar with chirp According to the charecteristics of the backscattered light from the rough surfaces of the target far away and the random phase matching rule, the method of coherent optical head coefficients designing is discussed. An optical system is developed that is an optical head of a coherent imaging CO2 laser radar with chirp pulse compression. In the experimental laser radar only one continuous wave single mode CO2 laser is used, and the signals from a building of 7.8 km away are obtained with acceptable SNR while the lase output is about 5 W..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1079 (1999)
Strained InGaAs/AlGaAs Double Quantum Well Laser with GRIN-SCH
[in Chinese], [in Chinese], and [in Chinese]
Strained InGaAs/AlGaAs double quantum well lasers with two pairs of graded index (GRIN) heterostructure have been fabricated by MOCVD method. Its wavelength ranges from 970 to 982 nm, threshold current density is 140 A/cm2 at room temperature CW operation. 520 mW/facet and 1.49 W/facet for CW output optical power has bStrained InGaAs/AlGaAs double quantum well lasers with two pairs of graded index (GRIN) heterostructure have been fabricated by MOCVD method. Its wavelength ranges from 970 to 982 nm, threshold current density is 140 A/cm2 at room temperature CW operation. 520 mW/facet and 1.49 W/facet for CW output optical power has been obtained under 0.9 A and 2.0 A operation, respectively. The maximum CW output optical power can come up to 2.4 W/facet..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1084 (1999)
Stimulated Brillioun Scattering Phase-Conjugate Resonator and Internal Optical Parametric Oscillator
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Making use of optical phase conjugation effect and Q-switch effect in stimulated Brillioun scattering (SBS), a Nd:YAG laser with phase-conjugate resonator is developed. By this way, the reflecting mirror and Q-switch in traditional lasers are not used. The laser output is 100 mJ, and the pulse width is 13 ns. The correMaking use of optical phase conjugation effect and Q-switch effect in stimulated Brillioun scattering (SBS), a Nd:YAG laser with phase-conjugate resonator is developed. By this way, the reflecting mirror and Q-switch in traditional lasers are not used. The laser output is 100 mJ, and the pulse width is 13 ns. The corresponding total converse efficiency of the laser is 0.47%. In addition, a KTP optical parametric oscillator was inserted into the phase-conjugate resonator, the optical parameter oscillator (OPO) output wavelength of 1.57μm and the output energy of 15mJ can been obtained. The result indicates that the OPO in SBS phase conjugation resonator is feasible..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1089 (1999)
Materials
Measurement of Principal Refractive Indices and Thermal Refractive Indix Coefficients of Improved KTP Crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The principal refractive indices and the thermal refractive index coefficients of 0.075 mol fraction Nb:KTiOPO4 crystal have been measured by the autocollimation method at wavelengths of 0.5398, 0.6328, 1.0795 and 1.3414 μm. The sellmeier′s equations were obtained and used to calculate the type II optimum phase matchinThe principal refractive indices and the thermal refractive index coefficients of 0.075 mol fraction Nb:KTiOPO4 crystal have been measured by the autocollimation method at wavelengths of 0.5398, 0.6328, 1.0795 and 1.3414 μm. The sellmeier′s equations were obtained and used to calculate the type II optimum phase matching angle, the calculated results agree well with the experimental results..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1134 (1999)
Nonlinear Optical Characteristic of Photoluminescence from Porous Silicon
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The photoluminescence (PL) spectra and photoluminescence excitation (PLE) spectra under near infrared (800 nm) excitation from porous silicon (PS) prepared by electrochemical anodization method are measured. The results show that PS has efficient infrared-upconversion luminescence, and the peak intensity increased obviThe photoluminescence (PL) spectra and photoluminescence excitation (PLE) spectra under near infrared (800 nm) excitation from porous silicon (PS) prepared by electrochemical anodization method are measured. The results show that PS has efficient infrared-upconversion luminescence, and the peak intensity increased obviously as the reserved time prolonged. This nonlinear optical response enhancement effect is related to the excited local binded exciton interacted by space quantum confined effect. The multipeak in PL spectra show that there are many kinds of different luminescence centers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1138 (1999)
Optical Devices
Study and Fabrication of MMI GaAs Optical Power Splitter
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A 1×4 multimode interference (MMI) optical power splitter is designed by means of guided-model propagation analysis. Considering the possible factors which would influence the properties of the device in the procedure of designing and fabricating, the influence of the parameters was analyzed, such as the width, thA 1×4 multimode interference (MMI) optical power splitter is designed by means of guided-model propagation analysis. Considering the possible factors which would influence the properties of the device in the procedure of designing and fabricating, the influence of the parameters was analyzed, such as the width, the length and the index of waveguide, on the performance of the device. Then the MMI optical power splitter is fabricated and measured. The measuring results show that the fuction of the fabricated device can be realized. In accordance with the problems occured during the experiment and measurement, opinions and methods are presented to improve the performance of the device..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1023 (1999)
An Optical Isolator Using a New Type Prism
[in Chinese], and [in Chinese]
The performance of a polarization-independent isolator using a new type polarizing splitting prism are analysed in theory and studied by experiment. Theoretical and experimental results indicate that the isolation is nearly two times greater than before, and the insertion loss just increases a little. Experiment shows The performance of a polarization-independent isolator using a new type polarizing splitting prism are analysed in theory and studied by experiment. Theoretical and experimental results indicate that the isolation is nearly two times greater than before, and the insertion loss just increases a little. Experiment shows that the insertion loss and the isolation from fiber to fiber of the isolator are -0.82 dB and -48.1 dB, respectively..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1130 (1999)
Quantum Optics
Two-Photon Decay of Two-Atom Dressed State in a Microcavity
[in Chinese], [in Chinese], and [in Chinese]
The problem of atomic decay in the microcavity is discussed. Suppose that there are two atoms in the microcavity, the decay in the interaction between cavity wall and the dressed atom caused by strong couple of the two atoms and cavity field is discussed in specific initial condition. It is pointed out that the decay iThe problem of atomic decay in the microcavity is discussed. Suppose that there are two atoms in the microcavity, the decay in the interaction between cavity wall and the dressed atom caused by strong couple of the two atoms and cavity field is discussed in specific initial condition. It is pointed out that the decay in that case is stronger when there are more photons in the microcavity..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1052 (1999)
Rapid Communications
Digital Measurements and Fabrication of Low loss Optical Organic Polymer Waveguides
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The techniques of fabricating low loss optical organic polymer waveguides are demonstrated. A new methodCCD camera photographing methodis applied to detect the propagation loss in the waveguide. The samples with propagation losses less than 0.5 dB/cm at 632.8 nm are fabricated experimently.The techniques of fabricating low loss optical organic polymer waveguides are demonstrated. A new methodCCD camera photographing methodis applied to detect the propagation loss in the waveguide. The samples with propagation losses less than 0.5 dB/cm at 632.8 nm are fabricated experimently..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1142 (1999)
Spectroscopic Characteristics of Cr3+ Doped Glass-Ceramics
[in Chinese], [in Chinese], and [in Chinese]
Transparent glass-ceramics doped by Cr3+ was prepared by the process of phase separation and the raw materials of analytical reagents in the system of B2O3-Al2O3-SiO2. The absorption and emission spectra of glass and glass-ceramics were measured respectively. The spectroscopic characteristics were studied.Transparent glass-ceramics doped by Cr3+ was prepared by the process of phase separation and the raw materials of analytical reagents in the system of B2O3-Al2O3-SiO2. The absorption and emission spectra of glass and glass-ceramics were measured respectively. The spectroscopic characteristics were studied..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1146 (1999)
Soft X-Ray Images of Hydrated Biological Samples in a Vacuum
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A simple and practicable method was adopted to image the biological samples, plant leaf epidermal cells after being fixed, using soft X-rays in a vacuum environment. The micrographs of their cells were acquired in the experiment. Compared with the image method in air, this method has some advantages such as exposure tiA simple and practicable method was adopted to image the biological samples, plant leaf epidermal cells after being fixed, using soft X-rays in a vacuum environment. The micrographs of their cells were acquired in the experiment. Compared with the image method in air, this method has some advantages such as exposure time decreasing and operation safe..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1150 (1999)
Vision, Color, and Visual Optics
Design and Study on Color Sensitive Function
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
According to the chromatic′s theory, color sensitive functions of object, light source and human eyes are defined in the widely used CIE1976L*a*b* color space and color difference［1］. Mathematics formulae are deduced. The three kinds of color sensitive functions are studied systematically and comprehensively in the whoAccording to the chromatic′s theory, color sensitive functions of object, light source and human eyes are defined in the widely used CIE1976L*a*b* color space and color difference［1］. Mathematics formulae are deduced. The three kinds of color sensitive functions are studied systematically and comprehensively in the whole color space. The general law of color sensitive functions are concluded. Mathematics models of the three kinds of color sensitive function can be used in some fields such as computer color matching, making light source and simulation of human eyes of colorimeter..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 8, 1057 (1999)
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