2 µm ultra-low relative intensity noise and frequency noise of single frequency fiber laser for next-generation gravitational wave detectors

Qian Zhang; Yubin Hou; Weihua Song; Xi Wang; Zhigang Peng; Xu Chen; Carl Blair; Ju Li; Chunnong Zhao; Pu Wang

doi:10.1117/12.2579001

5 March 2021 2 μm ultra-low relative intensity noise and frequency noise of single frequency fiber laser for next-generation gravitational wave detectors

Qian Zhang, Yubin Hou, Weihua Song, Xi Wang, Zhigang Peng, Xu Chen, Carl Blair, Ju Li, Chunnong Zhao, Pu Wang

Author Affiliations +

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116650D (2021) https://doi.org/10.1117/12.2579001
Event: SPIE LASE, 2021, Online Only

Abstract

We demonstrated an ultra-low noise polarization-maintaining (PM) single frequency fiber laser (SFFL) at 2 μm. By suppressing the pump relative intensity noise (RIN) using a feedback loop control, the RIN and frequency noise of the SFFL are simultaneously reduced, and the reduction is about 3 - 15 dB and 3 - 8.4 dB, respectively. After two stage Tm³⁺-doped PM fiber amplifier, the output power reached about 5 W. Meanwhile, the frequency noise almost has no increases, which is still below 100 Hz/√Hz after 13 Hz. And the frequency-tunable range is approximately 2 GHz with frequency response of 46 MHz/V.

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Qian Zhang, Yubin Hou, Weihua Song, Xi Wang, Zhigang Peng, Xu Chen, Carl Blair, Ju Li, Chunnong Zhao, and Pu Wang "2 μm ultra-low relative intensity noise and frequency noise of single frequency fiber laser for next-generation gravitational wave detectors", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116650D (5 March 2021); https://doi.org/10.1117/12.2579001

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