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Contents
2003
Volume: 30 Issue 1
22 Article(s)
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Research Article
Experimental Study on Metastable-neon Atom Lithography
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The atomic lithography experiments were carried out by use of a metastable neon atomic beam. Metallic meshes were used as masks, and the carbon films produced from the organic molecules of diffusion pump oil, which were adsorbed on the surface of wafers and exposed to the high energy metastable neon atomic beams. The mThe atomic lithography experiments were carried out by use of a metastable neon atomic beam. Metallic meshes were used as masks, and the carbon films produced from the organic molecules of diffusion pump oil, which were adsorbed on the surface of wafers and exposed to the high energy metastable neon atomic beams. The microstructures on the silicon wafers with the resolution of microns were obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 22 (2003)
Linearly Torsion Sensor of Fiber Grating with Temperature-independent
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel combination type sensing structure of the torsion beam has been designed, in which the fiber grating with a determinate length is bonded to the interface between the solid beam and air core beam with a determinate angle along the direction of the axes of the torsion beam. Using the difference of the strain distA novel combination type sensing structure of the torsion beam has been designed, in which the fiber grating with a determinate length is bonded to the interface between the solid beam and air core beam with a determinate angle along the direction of the axes of the torsion beam. Using the difference of the strain distribution at the two sides of the interface between the real core beam and air core beam, through measuring the reflective wavelength difference of two sides of the interface, the torsional sensing of the fiber grating with the temperature independent has been realized. Theoretical analyses and experimental results indicate that this sensor can automatically remove the temperature cross sensitivity in torsional sensing, the wavelength shift difference of the fiber grating in the sides of the interface is linear to the torsional angel, the torque and torsional stress with the determinate arm of force, and this relationship is not dominated by the temperature change. In the range of the torsional angle and torque sensitivities are 0.092 nm/degree, 2.076 nm/Nm, respectively..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 83 (2003)
Beam Transmission
Analysis of the Propagation of Light in Fiber Media
[in Chinese], and [in Chinese]
In this paper, it is analyzed the propagation of a Gaussian beam in fiber media with ray tracing under the paraxial approximation. Using different refractive index distributions, the phenomena of plasma waveguide and the application of a ring shaped beam in the manipulation of particles are discussed, separately.In this paper, it is analyzed the propagation of a Gaussian beam in fiber media with ray tracing under the paraxial approximation. Using different refractive index distributions, the phenomena of plasma waveguide and the application of a ring shaped beam in the manipulation of particles are discussed, separately..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 29 (2003)
Biomedical Photonics and Laser Medicine
Study of Fluorescent Spectrum of Blood Induced by Lights of Different Wavelengths
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The blood taken from a healthy human vein is irradiated by different wavelength lights at 502 nm, 530 nm and 632.8 nm. The fluorescent spectra are tested by the grating spectrograph. The result indicates that the fluorescent intensity of the blood induced by the light at 530 nm is the strongest. The fluorescence of theThe blood taken from a healthy human vein is irradiated by different wavelength lights at 502 nm, 530 nm and 632.8 nm. The fluorescent spectra are tested by the grating spectrograph. The result indicates that the fluorescent intensity of the blood induced by the light at 530 nm is the strongest. The fluorescence of the blood induced by the light at 502 nm is very weak. The emitting spectrum of the blood induced by the light of 632.8 nm appears in both side of 632.8 nm. This result shows that the processes of interaction between laser and blood may be different when wavelengths of the exciting lights are different. So the biological effects of the lights on the blood may be different..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 93 (2003)
Laser Physics
Influence of Mixture Component and Peaking Capacitor on the Performance of an UV Preionized Pulsed HF Laser
[in Chinese], [in Chinese], and [in Chinese]
The influence of the peaking capacitor and the pressure of mixture gas on the performance of UV preionized pulsed HF laser is investigated. There exist an optimum mixing ratio (SF 6/C 2H 6=20∶1) and an optimum capacitor ratio (C p/C s=0.3). In addition, the laser pulse width decreases as the gas pressure increases. UThe influence of the peaking capacitor and the pressure of mixture gas on the performance of UV preionized pulsed HF laser is investigated. There exist an optimum mixing ratio (SF 6/C 2H 6=20∶1) and an optimum capacitor ratio (C p/C s=0.3). In addition, the laser pulse width decreases as the gas pressure increases. Under the optimum mixing ratio the maximum attainable output energy and the optimal pressure increase with increase of the charging voltage. The laser gives laser output energy up to 400 mJ with a maximum electric efficiency about 2.2% and the specific energy 31.7 J/l·atm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 1 (2003)
Study on Characteristics of Tunable Fiber Laser Employing AOTF
[in Chinese], and [in Chinese]
A new style tunable fiber laser in which an acoustooptic tunable filter (AOTF) and an erbium doped fiber combine to form a Fabry Perot resonator is presented and theoretically investigated in this article. It has wide tunable range and can be conveniently and rapidly tuned by changing the acoustic frequency. Under neglA new style tunable fiber laser in which an acoustooptic tunable filter (AOTF) and an erbium doped fiber combine to form a Fabry Perot resonator is presented and theoretically investigated in this article. It has wide tunable range and can be conveniently and rapidly tuned by changing the acoustic frequency. Under neglecting excited state absorption (ESA) and amplification of spontaneous emission (ASE), the linewidth, tunable characteristic, pump threshold and slope efficiency of the laser have been calculated. At the center wavelength of 1550 nm, an output peak with a FWHM of 0.26 nm is obtained; the tuned peak gap is about 8.95 nm when the acoustic frequency is changed 1 MHz. Theoretically, the tunable range is confined only by erbium doped fiber gain and filter bandwidth. The calculational results indicate the pump threshold and slope efficiency of this laser are 0.795 mW and 15.15%, respectively..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 5 (2003)
Study on Optimal Operating Condition of Gain-switched Semiconductor Laser Diode
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The optimal operating condition of gain switched semiconductor laser with different modulation rate is studied in this paper. The theoretical results point that the optimal operating condition is quite different for the variation of modulation rate. In the condition of low modulation rate, small bias current should be The optimal operating condition of gain switched semiconductor laser with different modulation rate is studied in this paper. The theoretical results point that the optimal operating condition is quite different for the variation of modulation rate. In the condition of low modulation rate, small bias current should be applied to avoid the tailing of output pulse. In the condition of high modulation rate, large bias current should be applied in order to improve the extinction ratio of the pulse. The theoretical results agree well with the experimental results..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 12 (2003)
Static Character Analysis and Experiment of Gain-clamped SOA
[in Chinese], [in Chinese], and [in Chinese]
Time domain GC SOA model is used to analysis the static character of GC SOA. It is proved that the 3dB saturation output power of GC SOA is higher than the conventional SOA, and its gain is much more stable than the conventional SOA before saturation. The external feedback GC SOA is set up, and the experiments on it shTime domain GC SOA model is used to analysis the static character of GC SOA. It is proved that the 3dB saturation output power of GC SOA is higher than the conventional SOA, and its gain is much more stable than the conventional SOA before saturation. The external feedback GC SOA is set up, and the experiments on it show the special characters of GC SOA..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 17 (2003)
Matrix Analysis of Eigen Mode-fields of the Circular Plano-concave Resonator with a Gaussian-reflectivity Mirror
[in Chinese], [in Chinese], and [in Chinese]
By means of the Collins Formula in pole coordinates, diffraction integral equation of the circular plano concave resonator is transformed to matrix equation, and eigen mode fields of the circular plano concave resonator with a Gaussian reflectivity mirror is calculated. It is shown that the circular plano concave resonBy means of the Collins Formula in pole coordinates, diffraction integral equation of the circular plano concave resonator is transformed to matrix equation, and eigen mode fields of the circular plano concave resonator with a Gaussian reflectivity mirror is calculated. It is shown that the circular plano concave resonator with a Gaussian reflectivity mirror has a good choosing capability for transverse modes..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 25 (2003)
Materials and Thin Films
Optimal Design of Narrow-band Filter with Genetic Arithmetic
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A narrow band filter design method based on genetic arithmetic is provided in this paper. Theoretical analysis model is built up. A 50GHz filter is optimized according to the programme. Compared with the films system obtained by needle design, it has less bandpass loss, ripple coefficient and higher rectangle degree.A narrow band filter design method based on genetic arithmetic is provided in this paper. Theoretical analysis model is built up. A 50GHz filter is optimized according to the programme. Compared with the films system obtained by needle design, it has less bandpass loss, ripple coefficient and higher rectangle degree..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 57 (2003)
Measurement and Metrology
Study on Spectropolarimeter
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The paper reports a method and a spectropolarimeter for determining the polarization state of an emitted or reflected light in terms of its Stokes parameters. The polarization remote data of different objects on the terrestrical surface were obtaineded from the plane, which will play an important role in developing polThe paper reports a method and a spectropolarimeter for determining the polarization state of an emitted or reflected light in terms of its Stokes parameters. The polarization remote data of different objects on the terrestrical surface were obtaineded from the plane, which will play an important role in developing polarization remote sensing..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 60 (2003)
Characterization of the Output of 15 TW/35 fs Intense Laser System by Using the Method of SPIDER
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By means of the method of SPIDER (Spectral Phase Interferometry for Direct Electrical Reconstruction) , the characteristics of the output of a 15 TW/35 fs table top Ti∶sapphire ultrashort ultraintense laser system have been measured, which include the phase and the time depended intensity of the pulse. The results showBy means of the method of SPIDER (Spectral Phase Interferometry for Direct Electrical Reconstruction) , the characteristics of the output of a 15 TW/35 fs table top Ti∶sapphire ultrashort ultraintense laser system have been measured, which include the phase and the time depended intensity of the pulse. The results show that the output pulse of this system has good relative phase distribution )the phase difference between every two spectrums<2π), and the duration of the output pulse is 33fs. Consequently, the system has reached the aim of the design..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 65 (2003)
Study of Photoelasticity of Optical Material by Using Laser Heterodyne Interferometer
[in Chinese]
In this paper a new method of measuring some parameters of photoelasticity is presented, and the heterodyne interferometry has successfully been applied to the field of photoelasticity of selected optical materials. A device which brings atmosphere to bear on the optical materials has been developed to measure the chanIn this paper a new method of measuring some parameters of photoelasticity is presented, and the heterodyne interferometry has successfully been applied to the field of photoelasticity of selected optical materials. A device which brings atmosphere to bear on the optical materials has been developed to measure the change of refractive index at different pressures, and the relationship between the given pressure and the corresponding change of refractive index has been obtained through a series of experiments. Also, a careful analysis is given to the results of the experiments. The simple device and the easy method can make the last measuring precision of change of refractive index reach 8.4×10 -8 with small stress applied..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 68 (2003)
Study of Sensing and Measurement for Vertically Mechanical Quantities Using Single Fiber Grating
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the characteristic of the fiber grating wavelength absolute encoding, the vertical sensing measurements of the stress, displacement have been realized by means of the improving the structure design of the free end of the cantilever beam. The theoretical analyses and the experimental results indicate that the mBased on the characteristic of the fiber grating wavelength absolute encoding, the vertical sensing measurements of the stress, displacement have been realized by means of the improving the structure design of the free end of the cantilever beam. The theoretical analyses and the experimental results indicate that the magnitudes and the vertical directions of the mechanical quantities, such as stress, displacement and etc. can be sensed and measured through monitoring the value and direction of the wavelength shift of the fiber grating that is bonded to the near fixed end of the cantilever beam. In the vertical directions, the experimental sensitivities of the stress are 1 87 nm/N and 3 40 nm/N, the experimental sensitivities of the displacement are 0 23 nm/mm and 0 41 nm/mm, respectively..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 71 (2003)
Reflex Optical Fiber Sensor and Compensation Technique for Temperature Measurement under Offshore Oil Well
[in Chinese], [in Chinese], and [in Chinese]
A novel fiber optic sensor used for temperature measurement under the offshore oil well was proposed based on the displacement of the optical absorption edge occurring in semiconductors under the influence of temperature variation as a result of temperature induced energy shifting of conduction band extrema. The structA novel fiber optic sensor used for temperature measurement under the offshore oil well was proposed based on the displacement of the optical absorption edge occurring in semiconductors under the influence of temperature variation as a result of temperature induced energy shifting of conduction band extrema. The structure of the sensor and the measurement principle were described. The common path reference measurement and node type error compensation technologies were developed. And the detailed theoretical analysis indicated that the proposed sensor system could effectively improve measurement errors caused by the light fluctuation, difference and variation of the detector responsiveness and the circuit magnification times, the transmission loss, and so on. It approved that this sensor system could be applied under the long term formidable conditions with fairly good measurement stability. The temperature measurement range is from -20℃ to 175℃..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 75 (2003)
Laser Light Scattering Study on the Dynamic Behavior of Nematic E7 Liquid Crystal
[in Chinese], and [in Chinese]
The dynamic behavior of nematic E7 liquid crystal is investigated by the technique of dynamic laser light scattering. The results show that the two relaxation modes, splay and twist modes, can be observed at the same time in feasible range of scattering angles in different temperatures. The viscoelastic parameters can The dynamic behavior of nematic E7 liquid crystal is investigated by the technique of dynamic laser light scattering. The results show that the two relaxation modes, splay and twist modes, can be observed at the same time in feasible range of scattering angles in different temperatures. The viscoelastic parameters can also be given from the measurement..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 79 (2003)
Optical Communication
Optical Matrix Switch Based on Polarization
[in Chinese], [in Chinese], and [in Chinese]
A novel method to fabricate optical matrix switch based on polarization is presented, by controlling polarization states of signal beams to obtain non blocking cross connect. The detailed implementation of the node switches and the switching network are given. A 4×4 optical matrix switch fabricated with this methoA novel method to fabricate optical matrix switch based on polarization is presented, by controlling polarization states of signal beams to obtain non blocking cross connect. The detailed implementation of the node switches and the switching network are given. A 4×4 optical matrix switch fabricated with this method is tested, and the experiment result demonstrates that it characterizes by low insertion loss, low cross talk, medium switching speed (ms), performance stability and technology maturity, which is quite suitable for small sized optical matrix switch..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 33 (2003)
100 Mb/s Polymer Optical Fiber Communication Link System
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A 100 Mb/s link for polymer optical fiber communication is reported, and multimedia information has been successfully transmitted on this link. The experimental results indicate that the transmission speed can reach to 100 Mb/s 100 m.A 100 Mb/s link for polymer optical fiber communication is reported, and multimedia information has been successfully transmitted on this link. The experimental results indicate that the transmission speed can reach to 100 Mb/s 100 m..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 38 (2003)
Experimental Research on Optical Code Division Multiplex Access System Based on Spectral Slicing
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical code division multiplex access (OCDMA) transmission system experiment based on spectral splicing is demonstrated. Different users are distinguished by the different free spectral range (FSR) of the tunable Fabry Perot cavity of the encoder/decoders. The influence of the multiple access interference (MAI) on theOptical code division multiplex access (OCDMA) transmission system experiment based on spectral splicing is demonstrated. Different users are distinguished by the different free spectral range (FSR) of the tunable Fabry Perot cavity of the encoder/decoders. The influence of the multiple access interference (MAI) on the system performance is analyzed. The performance of the transmitter, the optical channel and the encoder/decoder is discussed. The BER measurement is also realized. The test results show that the bit error rate is better than 10 -9 after transmission of 11 km simple mode fiber with the access rate of 155 Mb/s and the MAI value 30 times higher than received optical power. This system is a possible solution for the future all optical access system for its lower cost and simple structure..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 41 (2003)
Study of the Statistical Characteristics of Second-order Polarization Mode Dispersion by Jones Transfer Matrix Method
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Statistical characteristics of second order polarization mode dispersion (2 nd PMD) are investigated by Jones Transfer Matrix method. The model in which the value of PMD varies with step size in simulation is corrected. Using this corrected model, the frequency correlation function of PMD vector and the probability disStatistical characteristics of second order polarization mode dispersion (2 nd PMD) are investigated by Jones Transfer Matrix method. The model in which the value of PMD varies with step size in simulation is corrected. Using this corrected model, the frequency correlation function of PMD vector and the probability distribution of 2 nd PMD are obtained when the value of PMD is 25 ps; the results show good agreements with the theoretical prediction. It is necessary to higher order compensation in these conditions by analyzing the pulse broadening of an 8 ps width Gauss pulse briefly..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 45 (2003)
Study of the Arithmetic of Poincare Sphere Method to Measure Polarization Mode Dispersion
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The method of Poincare Sphere to measure the polarization mode dispersion (PMD) has been studied in the paper. Based on the statistical character of the output states, a simple and practical arithmetic to calculate the differential group delay (DGD) with the output states of polarization was put forward. With this aritThe method of Poincare Sphere to measure the polarization mode dispersion (PMD) has been studied in the paper. Based on the statistical character of the output states, a simple and practical arithmetic to calculate the differential group delay (DGD) with the output states of polarization was put forward. With this arithmetic, the PMD of a 11 km long single mode fiber and a 1.64 m long polarization maintain fiber have been calculated, and the feasibility of the arithmetic is confirmed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 49 (2003)
Polarization Insensitive Gain Medium for InGaAsP Optical Amplifiers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
It is fabricated that polarization insensitive gain medium for InGaAsP optical amplifiers. The active layer is a structure with alternating tensile and compressive strain quantum wells. The waveguide is made a taper with angled facets. In the experiment it is found that the structure can suppress the lasing and decreasIt is fabricated that polarization insensitive gain medium for InGaAsP optical amplifiers. The active layer is a structure with alternating tensile and compressive strain quantum wells. The waveguide is made a taper with angled facets. In the experiment it is found that the structure can suppress the lasing and decrease the polarization sensitivity. The imbalance between TE and TM gains is less than 0.5 dB at bias current 125 mA, and 0.1 dB at 100 mA. FWHM is 40 nm within large current..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 30, Issue 1, 53 (2003)
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