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 language | English |
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Pages (from-to) | 4911-4914 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 45 |
Issue number | 17 |
DOIs | |
Publication status | Published - 1 Sept 2020 |