Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier

doi:10.1088/1674-1056/23/4/044214

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 44214-044214.doi: 10.1088/1674-1056/23/4/044214

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier

刘明^{a b}, 张海涛^a, 巩马理^a, 赵跃进^b, 程文雍^a, 孟阔^a, 郑超^a, 陈倚竹^a

a State Key Laboratory of Tribology (SKLT11B05), Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China;
b Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

收稿日期:2013-02-03 修回日期:2013-10-10 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA8042032) and the National Natural Science Foundation of China (Grant Nos. 61077034 and 61301190).

Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier

Liu Ming (刘明)^{a b}, Zhang Hai-Tao (张海涛)^a, Gong Ma-Li (巩马理)^a, Zhao Yue-Jin (赵跃进)^b, Cheng Wen-Yong (程文雍)^a, Meng Kuo (孟阔)^a, Zheng Chao (郑超)^a, Chen Yi-Zhu (陈倚竹)^a

a State Key Laboratory of Tribology (SKLT11B05), Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China;
b Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

Received:2013-02-03 Revised:2013-10-10 Online:2014-04-15 Published:2014-04-15
Contact: Zhang Hai-Tao E-mail:zhanghaitao@mail.tsinghua.edu.cn
About author:42.55.Wd; 42.60.Da; 42.55.Ah
Supported by:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2011AA8042032) and the National Natural Science Foundation of China (Grant Nos. 61077034 and 61301190).

摘要/Abstract

摘要： A theoretical analysis of noise in a high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of a high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage in which the pulse energy receives more attention than the pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio (SNR) analysis. Then, an experiment that shows that the output SNR actually drops off in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion.

关键词: pulsed fiber amplifier, signal-to-noise ratio, cascaded amplifier, master oscillator power amplifier

Abstract: A theoretical analysis of noise in a high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of a high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage in which the pulse energy receives more attention than the pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio (SNR) analysis. Then, an experiment that shows that the output SNR actually drops off in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion.

Key words: pulsed fiber amplifier, signal-to-noise ratio, cascaded amplifier, master oscillator power amplifier

中图分类号: (Fiber lasers)

42.55.Wd

42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.55.Ah (General laser theory)

刘明, 张海涛, 巩马理, 赵跃进, 程文雍, 孟阔, 郑超, 陈倚竹. Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier[J]. 中国物理B, 2014, 23(4): 44214-044214.

Liu Ming (刘明), Zhang Hai-Tao (张海涛), Gong Ma-Li (巩马理), Zhao Yue-Jin (赵跃进), Cheng Wen-Yong (程文雍), Meng Kuo (孟阔), Zheng Chao (郑超), Chen Yi-Zhu (陈倚竹). Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier[J]. Chin. Phys. B, 2014, 23(4): 44214-044214.

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Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier

Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier

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