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基于特殊子环腔单纵模窄线宽掺铥光纤激光器

Single Longitudinal Mode Narrow Linewidth Thulium-Doped Fiber Laser with Special Subring Cavity

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摘要

提出并实验验证了一种稳定的单纵模窄线宽环形腔掺铥光纤激光器,通过使用特殊的子环腔和自制的光纤布拉格光栅,实现了稳定的单纵模激射和窄线宽输出。子环腔由3个互相连接的光耦合器组成,用来抑制密集的多纵模和跳模。采用自制的光纤布拉格光栅,作为窄线宽波长滤波器,最终实现了稳定的单纵模激射。实验结果表明,该激光器在室温下可获得中心波长为1940.6 nm,光信噪比为60 dB的稳定信号输出。其频率噪声采用基于3×3光耦合器的自零差技术进行测量。当测量时间为0.05 s时,由频率噪声计算的线宽大约为8 kHz。

Abstract

This paper proposes and experimentally tests a stable single longitudinal mode (SLM) narrow linewidth thulium-doped fiber laser by utilizing a special subring cavity and homemade fiber Bragg grating (FBG). The subring cavity comprising three interconnected optical couplers is employed for suppressing the dense multiple longitudinal and hopping modes. The narrow bandwidth wavelength filter, which is composed of the homemade FBG, achieves stable SLM operation. The experimental result shows that the laser can obtain a stable 1940.6 nm output with an optical signal-to-noise ratio (OSNR) of 60 dB at room temperature. Its frequency noise is measured using a 3×3 optical-fiber coupler with self-homodyne technology. The linewidth, which is calculated from frequency noise, is approximately 8 kHz when measurement time is 0.05 s.

Newport宣传-MKS新实验室计划
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DOI:10.3788/CJL201946.0901001

所属栏目:激光器件与激光物理

基金项目:国家自然科学基金、山东省高等学校科技计划项目;

收稿日期:2019-03-22

修改稿日期:2019-04-22

网络出版日期:2019-09-01

作者单位    点击查看

王雪:北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044
延凤平:北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044
韩文国:北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044

联系人作者:延凤平(fpyan@bjtu.edu.cn)

备注:国家自然科学基金、山东省高等学校科技计划项目;

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引用该论文

Xue Wang,Fengping Yan,Wenguo Han. Single Longitudinal Mode Narrow Linewidth Thulium-Doped Fiber Laser with Special Subring Cavity[J]. Chinese Journal of Lasers, 2019, 46(9): 0901001

王雪,延凤平,韩文国. 基于特殊子环腔单纵模窄线宽掺铥光纤激光器[J]. 中国激光, 2019, 46(9): 0901001

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