Improvement of Output Characteristics of a Large-Mode-Area Er-Doped Fiber Amplifier Pulse Pumped by a Cascaded Raman Fiber Laser With a Low Repetition Frequency

被引：1
|
作者：
Nomura J. [1 ]
Ohata N. [1 ]
机构：
[1] Mitsubishi Electric Corporation, Information Technology R&d Center, Kanagawa, Kamakura
来源：
IEEE Photonics Journal | 2023年 / 15卷 / 05期
基金：
日本科学技术振兴机构;
关键词：
Doped fiber amplifiers; Er-doped fibers; high power amplifiers; lidar; pulsed lasers; pump lasers;
D O I：
10.1109/JPHOT.2023.3317907
中图分类号：
学科分类号：
摘要：
We improve the output of a MOPA system that emits single-frequency high-energy optical pulses using a large mode area Er-doped fiber amplifier pumped by a cascaded Raman fiber laser with a low 150 Hz repetition frequency. It is found that the unwanted light generated in the cascaded Raman fiber laser at the same time as the pump light saps the gain of the amplifier and degrades its output characteristics. By combining the removal of unwanted light with a pulse pump technique, the pulse energy is improved from less than 1.0 mJ to 1.2 mJ with at the same time a SNR of 30 dB compared to 19 dB before the improvement. The percentage of power in the signal also improves from 61.0% to over 90.7%. © 2009-2012 IEEE.
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