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Improvements in long-term output energy performance of Nd:glass regenerative amplifiers

High Power Laser Science and Engineering 2017年第4期5卷 1-7页

作者： Peng Zhang Youen Jiang Jiangfeng Wang Wei Fan Xuechun Li Jianqiang Zhu National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Optical damages, which severely degrade the output energy performance of Nd:glass regenerative amplifiers, are discussed in detail in this paper. By a series of experiments, it has been confirmed that these damages result from laser-induced contamination. Based on this work, several improvements are made to boost output energy performance of the regenerative amplifier. The output energy of the regenerative amplifier after improvements declines 4% after 1000 h of operation, much less than it used to, 60% after 560 h of operation.

关键词： diode-pumped solid-state laser and application high-power laser high-power laser related laser components laser amplifiers laser induced damage preamplifiers

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Temperature Dependence of Sensitivity of Avalanche Photodiode Based Optical Receiver

Temperature Dependence of Sensitivity of Avalanche Photodiod...

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2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Ales Prokes Institute of Radio Electronics Brno University of Technology Brno Czech Republic

In the paper, the temperature dependence of the sensitivity of an avalanche-photodiode-based receiver applied in the free space optical communication link is discussed. Communication systems of this type are exposed to a wide range of operating temperatures, which markedly affect many photodiode and preamplifier parameters. The paper describes receiver sensitivity calculation, taking into consideration the temperature dependence of avalanche photodiode gain, excess noise factor, dark current and thermal noise of preamplifier resistances. Presented calculation is demonstrated on the connection of a small-area silicon APD operating in the wavelength range from 820 to 1150 nm with a transimpedance preamplifier using a bipolar junction transistor.

关键词： Temperature dependence Avalanche photodiodes Optical receivers preamplifiers Optical noise Optical fiber communication Temperature distribution Temperature sensors Dark current Thermal factors

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