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A Laser-Diode End-Pumped Nd：YVO4 Slab Laser at 1342 nm

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Chinese Physics Letters 2009年第1期26卷 100-101页

作者：闫莹张恒利刘洋邢冀川 School of Information Science and Technology Beijing Institute of Technology Beijing 100081

A laser-diode end-pumped Nd：YVO4 slab laser with a fiat-concave stable cavity at 1342nm is demonstrated. Under the pumping power of 92 W, a cw laser of output 17.8 W is obtained with the slope efficiency of 25.6%.

关键词： OUTPUT unstable resonator slope efficiency Output Diode Laser Continuous wave lasers

Laser Diode Pumped 1.54μm Er：Yb：Phosphate Glass Continuous Wave Compact Laser

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Chinese Physics Letters 2003年第10期20卷 1739-1740页

作者：商美茹张光寅孟凡臻宋峰张潮波丁欣 PhotonicsCenter NankaiUniversityTianjin300071

We report a cw Er3+:Yb3+ co-doped phosphate glass laser pumped by a laser diode. The maximum output power of 78.3 mW and a slope efficiency of 15.25% were achieved. The laser spectral region was from 1532 nm to 1535 nm, with the peak laser wavelength at 1534 nm. The laser modes and time stability were also measured. The thermal effect had little influence on the output in our experiment.

关键词： Laser Newton meter laser pumping Effect of heat glass lasers time stability slope efficiency Output Laser diode pumps maximum power output Compact laser modes Continuous wave

Effects of 946-nm thermal shift and broadening on Nd^(3+):YAG laser performance

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Chinese Physics B 2015年第12期24卷 342-345页

作者： Seyed Ebrahim Pourmand Ghasem Rezaei Department of Optics and Laser Engineering Estahban Branch Islamic Azad University Department of Physics College of Sciences Yasouj University

Spectroscopic properties of flashlamp pumped Nd^3＋：YAG laser are studied as a function of temperature in a range from-30℃ to 60℃. The spectral width and shift of quasi three-level 946.0-nm inter-Stark emission within the respective intermanifold transitions of ^4F3/2→^4I9/2are investigated. The 946.0-nm line shifts toward the shorter wavelength and broadens. In addition, the threshold power and slope efficiency of the 946.0-nm laser line are quantified with *** lower the temperature, the lower the threshold power is and the higher the slope efficiency of the 946.0-nm laser line is,thus the higher the laser output is. This phenomenon is attributed to the ion-phonon interaction and the thermal population in the ground state.

关键词： 946-nm Nd:YAG laser thermal broadening thermal shift flashlamp pump slope efficiency threshold power

PM567-Doped solid dye lasers based on PMMA

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Chinese Physics B 2007年第12期16卷 3681-3684页

作者：李晓晖樊荣伟夏元钦刘维陈德应 National Key Laboratory of Tunable Lasers Institute of Optical-Electronics Harbin Institute of Technology Harbin 150001 China

Polymers are a kind of attractive hosts for laser dyes due to their high transparency in both pumping and lasing ranges and superior optical homogeneity. In this paper solid dye samples based on polymethyl methacrylate （PMMA） doped with different concentrations of 1, 3, 5, 7, 8 -pentamethyl-2, 6-diethylpyrromethene-BF2 （PM567） are prepared. The absorption, fluorescence and lasing spectra of the samples are obtained. Wide absorption and fluorescence bands are obtained and a red shift of the maxima of the lasing emission spectra is observed. With the second-harmonic generation of Q-switched Nd：YAC laser （532 nm, -20 ns） pumping the samples longitudinally, the slope efficiencies of the samples are obtained. There is an optimal dye concentration for the highest slope efficiency when the pumping energy is lower than some typical value （-250 mJ）, and the highest slope efficiency 35.6% is obtained in the sample with a dye concentration of 2 × 10^-4 mol/L. Pumping the samples at a rate of 10Hz with a pulse energy as high as 200 mJ （the fluence is 0.2 J/cm^2）, the output energy drops to one-half of its initial value after approximate 15500 pulses and the normalized photostability is 5.17CJ/mol. A kind of solid dye laser which could have some applications is built.

关键词： solid dye laser PMMA slope efficiency photostability

Temperature Distribution in Ridge Structure InGaN Laser Diodes and Its Influence on Device Characteristics

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Journal of Semiconductors 2006年第3期27卷 499-505页

作者：李德尧黄永箴张书明种明叶晓军朱建军赵德刚陈良惠杨辉梁骏吾中国科学院半导体研究所集成光电子学国家重点联合实验室北京100083 中国科学院半导体研究所纳米光电子学实验室北京100083

Time-dependent thermal simulation of ridge-geometry InGaN laser diodes is carried out with a two-dimensional model. A high temperature in the waveguide layer and a large temperature step between the regions under and outside the ridge are generated due to the poor thermal conductivity of the sapphire substrate and the large threshold current and voltage. The temperature step is thought to have a strong influence on the characteristics of the laser diodes. Time-resolved measurements of light-current curves,spectra, and the far-field pattern of the InGaN laser diodes under pulsed operation are performed. The results show that the thermal lensing effect improves the confinement of the higher order modes and leads to a lower threshold current and a higher slope efficiency of the device while the high temperature in the active layer results in a drastic decrease in the slope efficiency.

关键词： InGaN laser diodes ridge waveguide thermal simulation threshold current slope efficiency