5 W ultra-low-noise 2 µm single-frequency fiber laser for next-generation gravitational wave detectors

Qian Zhang, Yubin Hou, Xi Wang, Weihua Song, Xu Chen, Wu Bin, Ju Li, Chunnong Zhao, Pu Wang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We demonstrated an ultra-low-noise polarization-maintaining (PM) single-frequency fiber laser at 2 µm. Both relative intensity noise (RIN) and frequency noise were improved by suppressing the pump source RIN using feedback control. After a two-stage Tm3+-doped PM fiber amplifier, the output power reached about 5 W, and the amplifier did not introduce any observable extra frequency noise. The frequency noise was less than 100 Hz/Hz above 13 Hz, which is comparable to the frequency noise of a typical seed laser of the Advanced LIGO high-power laser. The central wavelength was measured to be 1990.25 nm, with a polarization extinction ratio above 24 dB.

Original languageEnglish
Pages (from-to)4911-4914
Number of pages4
JournalOptics Letters
Volume45
Issue number17
DOIs
Publication statusPublished - 1 Sep 2020

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