Journals >Chinese Journal of Lasers
Contents
1999
Volume: 26 Issue 7
18 Article(s)
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Research Article
The Generation of Multi-wavelength Ultra-short Optical Pulses by Utilizing a Fiber Ring Laser-pumped Supercontinuum in an Optical Fiber
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Utilizing an optical ring laser as the optical source, and a dispersion shifted fiber as the nonlinear material, a supercontinuum optical spectrum over 40 nm width was successfully generated. The WDM signals with a wavelength separation of 3.2 nm from the 12 wavelength channels each transmitting 30～40 ps pulses at a reUtilizing an optical ring laser as the optical source, and a dispersion shifted fiber as the nonlinear material, a supercontinuum optical spectrum over 40 nm width was successfully generated. The WDM signals with a wavelength separation of 3.2 nm from the 12 wavelength channels each transmitting 30～40 ps pulses at a repetition rate of 2.5 GHz are generated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 594 (1999)
Study of the Measurement of Crystal Extinction Ratio by the Use of a Single 1/4 Wave Plate
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The relation of the crystal extinction ratio and stress-induced birefringence phase diffrence are analyzed in details. The method making use of a single 1/4 wave plate for measuring crystal extinction ratio is reported. The cumputational formula and testing results are given. The uncertainty is analyzed and it shows thThe relation of the crystal extinction ratio and stress-induced birefringence phase diffrence are analyzed in details. The method making use of a single 1/4 wave plate for measuring crystal extinction ratio is reported. The cumputational formula and testing results are given. The uncertainty is analyzed and it shows that the measuring uncertainty of this method is less than that of the method usually used..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 599 (1999)
Ultrasensitive Detection for Vibronic Spectroscopy of Rare Earth Ions——Study on Coordination of Terbium with Aminoacid in Low Concentration Solutions
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A time-resovled ultrasensitive detection technique of probing cooperative vibronic spectra of rare earth ions is described. Coordination of terbium ion with arginine in low concentration solutions is studied and the coordination number variation of water molecules with pH value in these solutions is determined quantitaA time-resovled ultrasensitive detection technique of probing cooperative vibronic spectra of rare earth ions is described. Coordination of terbium ion with arginine in low concentration solutions is studied and the coordination number variation of water molecules with pH value in these solutions is determined quantitatively with this technique. It is concluded that arginine can coordinate with terbium ion when pH>1, with the pH value of the solutions increasing, the coordination number of arginine increases..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 603 (1999)
Holography and Information Processing
Face Recognition by the Use of an Optical Parallel Single-channel Hit-miss Transform Processor
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new algorithm in which the defined hit-miss transform is reformulated by a grayscale erosion of the image with a grayscale structural element of three levels is developed. A necessary condition is defined to choose the correct intermediate grayscale level in the structural element. Then a single-channel incoherent opA new algorithm in which the defined hit-miss transform is reformulated by a grayscale erosion of the image with a grayscale structural element of three levels is developed. A necessary condition is defined to choose the correct intermediate grayscale level in the structural element. Then a single-channel incoherent optical correlator with only an image and a structural element is developed to execute the hit-miss transform in parallel by one step thresholding. Experimental results for the face recognition are demonstrated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 627 (1999)
Performance Analysis of DP-DSPI Ⅰ: Error and Control
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The performance of double-pulsed digital speckle pattern interferometry based on a Nd∶YAG laser system and spatial phase-shift algorithm is analyzed in detail, which involves the sampling error, digitization error, phase-shift error and the error caused by random speckle noise. The computer simulations are also used toThe performance of double-pulsed digital speckle pattern interferometry based on a Nd∶YAG laser system and spatial phase-shift algorithm is analyzed in detail, which involves the sampling error, digitization error, phase-shift error and the error caused by random speckle noise. The computer simulations are also used to give an entire statistical estimation of errors and simulation results show good agreement with a theoretical analysis..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 633 (1999)
Performance Analysis of DP-DSPIⅠⅠ: Visibility and Optimization
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In order to obtain the high-quality speckle correlation fringe pattern from double-pulse digital speckle pattern interferometry, the factors which might affect the visibility of correlation fringes are analyzed, and the visibility optimization of correlation-fringe pattern is presented.In order to obtain the high-quality speckle correlation fringe pattern from double-pulse digital speckle pattern interferometry, the factors which might affect the visibility of correlation fringes are analyzed, and the visibility optimization of correlation-fringe pattern is presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 640 (1999)
A Wave-front Reconstruction Technique
[in Chinese], and [in Chinese]
The major methods of wave-front reconstruction are fringe tracing and phase-shifting. The defaults exist in the two methods. The fringe tracing method acquires the prior distribution characteristics of the field to reconstruct the whole wave-front. The phase shifting method needs more than three interferograms on the sThe major methods of wave-front reconstruction are fringe tracing and phase-shifting. The defaults exist in the two methods. The fringe tracing method acquires the prior distribution characteristics of the field to reconstruct the whole wave-front. The phase shifting method needs more than three interferograms on the same view angle. In this paper, a phase unwrapping method is applied to reconstruct the wave-front basing on one interferogram. The method used in coherence measurement is based on Furrier transform. The reconstruction result is compared to the result acquired with the fringe tracing method..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 645 (1999)
The Gray Scale Fidelity of Images Retrieved from Holograms in Photorefractive Crystals
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, a new quantity, normalized nonlinear error (NNE) is proposed for the first time to our knowledge for the estimation of the gray scale fidelity of images retrieved from volume holograms stored in photorefractive Fe∶LiNbO3 crystals. Based on this, the dependence of gray scale fidelity on recording object-rIn this paper, a new quantity, normalized nonlinear error (NNE) is proposed for the first time to our knowledge for the estimation of the gray scale fidelity of images retrieved from volume holograms stored in photorefractive Fe∶LiNbO3 crystals. Based on this, the dependence of gray scale fidelity on recording object-reference beam ratios is experimentally investigated, and the results agree well with theoretical predictions. The dynamic evolution of the normalized nonlinear error during hologram recording is also studied. The results show that a satisfactory gray scale fidelity can be obtained as long as the recording beam ratio is carefully chosen, even if the recording time is short, hence the diffraction efficiency is quite low..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 649 (1999)
Laser Manufacturing
Experimental Study of Early Apoptotic Phase of the Mice Thymocytes Induced by He-Ne Laser Irradiation in Vitro
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The apoptosis of the mice thymocytes was induced with low power helium-neon laser irradiation in vitro. Flow cytomytry analysis of the mice thymocytes was detected by staining cells with a combination of Annexin V-FITC and propium iodide (PI) or rhodamine 123 (Rh123) and PI to show the early event of the apoptosis. TheThe apoptosis of the mice thymocytes was induced with low power helium-neon laser irradiation in vitro. Flow cytomytry analysis of the mice thymocytes was detected by staining cells with a combination of Annexin V-FITC and propium iodide (PI) or rhodamine 123 (Rh123) and PI to show the early event of the apoptosis. The cellular morphology of the staining cells was observed by the transmission electron microscope. The early phase apoptosis of the thymocytes increased obviously after 60 min He-Ne laser (light dose 47.694～51.822 J/cm2) irradiation. With the laser irradiation time prolonged and the light dose increased, the increase of the percentage of the early phase apoptosis of the thymocytes was observed. It shows that the thymocytes after the He-Ne laser irradiation show loss of asymmetry of the phospholipids on the plasma membrane, leading to exposure of phosphatidylserine on the outer surface, that is expressed with the Annexin V positive. The mitochondrial function of the thymocytes is lost, therefore mitochondrial transmembrane potential is markedly decreased. The Rh123 retention is decreased in the mitochondria, and fluorescence intensity is significantly decreased..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 661 (1999)
Laser Physics
Investigation of the Fidelity of Phase Conjugation of Single-cell with One Focus and Single-cell with Two Focuses
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper reports on the fidelity of Stimulated Brillouin Scattering of single-cell with one focus (SCOF) and single-cell with two focuses (SCTF). The results showed that in the case of SCOF the fidelity of SBS decreased slightly with the pump energy increasing, but for the SCTF, the fidelity is sensitive to the lengtThis paper reports on the fidelity of Stimulated Brillouin Scattering of single-cell with one focus (SCOF) and single-cell with two focuses (SCTF). The results showed that in the case of SCOF the fidelity of SBS decreased slightly with the pump energy increasing, but for the SCTF, the fidelity is sensitive to the length of the two focuses. When the length is short, the fedility is almost unchanged, however, when the length is long, the fidelity increased and the biggest enhencement is up to 13%. An explanation to this phenomenon is given. The experimental results support this interpretation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 513 (1999)
Buffer Gas Pressure Effects on Copper Vapor Laser Output Characteristics
[in Chinese], [in Chinese], and [in Chinese]
An experiment which deals with pressure effects on the output characteristics of a small radial copper vapor laser is described. When the buffer gas pressure is increased from 2.0 kPa to 10.0 kPa, the plasma tube resistance increases. At the optimal pressure about 2.7 kPa, the output power has a maximum. Moreover, follAn experiment which deals with pressure effects on the output characteristics of a small radial copper vapor laser is described. When the buffer gas pressure is increased from 2.0 kPa to 10.0 kPa, the plasma tube resistance increases. At the optimal pressure about 2.7 kPa, the output power has a maximum. Moreover, following the increasing of the gas pressure, the pulse duration time first decreases and later increases, and the critical pressure is 4.7 kPa. The intensity profile of the laser output shows a lower axial intensity and a higher intensity on the tube wall at the higher pressure..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 577 (1999)
An All-fiber Compound Ring Laser and Its Use as a Rotation Sensor
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By the theory of syntonic mode-selecting in the compound ring in which a narrow-band taped fiber filter is embedded and by the uncoupling effect on the bidirectionally operating syntonic mode in the ring of the self-provided saturable absorption under the near threshold operation, a bidirectional, simultaneous, single-By the theory of syntonic mode-selecting in the compound ring in which a narrow-band taped fiber filter is embedded and by the uncoupling effect on the bidirectionally operating syntonic mode in the ring of the self-provided saturable absorption under the near threshold operation, a bidirectional, simultaneous, single-mode operating compact Er-doped fiber ring laser with the same frequency is realized, the measurement of rotation sensing of the all fiber ring laser is performed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 581 (1999)
A New Method for the Numerical Simulation of Erbium Doped Fiber Amplifiers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, a new method is proposed for the numerical simulation of erbium-doped fiber amplifiers (EDFA′s), which are modeled as homogeneously broadened two-level systems. The basic point of the method is to first solve out the population inversion along the erbium-doped fiber, then calculate other amplifier properIn this paper, a new method is proposed for the numerical simulation of erbium-doped fiber amplifiers (EDFA′s), which are modeled as homogeneously broadened two-level systems. The basic point of the method is to first solve out the population inversion along the erbium-doped fiber, then calculate other amplifier properties. This approach is highly efficient and accurate for the simulation of various complex-structure EDFA′s with arbitrary setup of modeling parameters. Fiber background loss or excited state absorption can also be considered. Based on the accurate measurement of fiber parameters, a comparison between the experimental and simulated results shows reasonable agreement..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 585 (1999)
Evaluation of the Beam Quality of a High Average Power Pulse TEA CO2 Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The far field beam profiles up to 33m of a high average power high repetition rate TEA CO2 laser were measured and the beam quality parameters such as M2 factor, waist width and divergence angles were also evaluated.The far field beam profiles up to 33m of a high average power high repetition rate TEA CO2 laser were measured and the beam quality parameters such as M2 factor, waist width and divergence angles were also evaluated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 589 (1999)
Lasing without Inversion in an Open V-type Three-level System
[in Chinese], [in Chinese], and [in Chinese]
A Theory of noninversion lasing in an open V-type three-level system is presented. The steady-state analysis shows that under certain conditions, noninversion lasing can be realized without an additional pump which is required by noninversion lasing in a general closed V-type three-level system. The dependence of the gA Theory of noninversion lasing in an open V-type three-level system is presented. The steady-state analysis shows that under certain conditions, noninversion lasing can be realized without an additional pump which is required by noninversion lasing in a general closed V-type three-level system. The dependence of the gain behavior of the system on Rabi frequency of the driving field and other parameters is also illustrated and analyzed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 608 (1999)
Stability and Formation Mechanism of Neutral Oxygen-rich Mixed Clusters Al5O3,Al7O4,Al9O7
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Evolution of photoionization mass spectra of aluminum-oxygen mixed clusters, with the concentration of oxygen, has been investigated. Direct evidence has been revealed which supports the fusion mechanism for the formation of oxygen-rich species Al5O3, Al7O4, and Al9O7.Evolution of photoionization mass spectra of aluminum-oxygen mixed clusters, with the concentration of oxygen, has been investigated. Direct evidence has been revealed which supports the fusion mechanism for the formation of oxygen-rich species Al5O3, Al7O4, and Al9O7..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 619 (1999)
The Influence of Medium Parameters on the Transmitted Intensity and Shape of Ultrashort Laser Pulses
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The most biological tissues are a kind of turbid media. After transmitting through the turbid media, the laser pulse energy will be attenuated and the pulse shape will be changed by scattering and absorption. Besides, the ultrashort laser pulse will be widened by the diffusive scattering. The various medium parameters The most biological tissues are a kind of turbid media. After transmitting through the turbid media, the laser pulse energy will be attenuated and the pulse shape will be changed by scattering and absorption. Besides, the ultrashort laser pulse will be widened by the diffusive scattering. The various medium parameters have different influence on the transmission of the laser pulse. Based on the diffusion approximation theory, this paper researched quantitatively the influence of the thickness d, the absorption coefficient μa, the scattering coefficient μs, and the anisotropy coefficient g on the ultrashort laser pulse transmission througt turbid media..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 622 (1999)
Materials and Thin Films
Effects of Divalent Ions in Subphase on Optical Properties of Hemicyanine Langmuir-Blodgett multilayers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The surface pressure-area isotherms of a new type of two legged inert amiphiphilic molecule 1. 10-bistearyl-4.6.13.15-tetraene-8-nitrogen-6(abbreviated as NC) monolayers at the air-water interface in the subphase containing divalent ions (Cd2+,Ba2+,Co2+) and the effects of divalent ions in the subphase on the UV-visiblThe surface pressure-area isotherms of a new type of two legged inert amiphiphilic molecule 1. 10-bistearyl-4.6.13.15-tetraene-8-nitrogen-6(abbreviated as NC) monolayers at the air-water interface in the subphase containing divalent ions (Cd2+,Ba2+,Co2+) and the effects of divalent ions in the subphase on the UV-visible absorption spectroscopy, steady-state fluorescence spectroscopy and optical nonlinear properties of Y-type hemicyanine/NC interleaving Langmuir-Blodgett multilayers were investigated. The π-A isotherms of NC molecules are strongly dependent on the divalent ions in the subphase. It was found that the peak positions of absorption and steady state fluorescence spectra of the alternating multilayers and the optical second harmonic intensity varied with the divalent ions in the subphase. The 2ω resonance effect of β was responsible for the observed χ(2) enhancement..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 26, Issue 7, 656 (1999)
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