Abstract
A 1120nm linearly polarized all-fiber single-frequency amplifier based on Yb-doped fiber (YDF) is reported. A maximum output power of 30W is achieved by 976nm clad-pumping and 1018nm core-pumping, with corresponding slope efficiencies of 51.9% and 70.0%, respectively. With the 976nm clad-pumping configuration, a signal to amplified spontaneous emission (ASE) ratio of more than 45dB is realized at maximum output power. The polarization extinction ratio of the amplifier is measured to be more than 21dB in the whole power scaling process. In addition, the intensity noise of the amplifier at maximum output power is also characterized to be around -130d B c/H z at frequencies above 2kHz and is comparable to that of the seed laser. Moreover, the deterioration of frequency noise and linewidth of the amplified laser is negligible. To the best of our knowledge, this is the highest output power of a single-frequency all-fiber amplifier that exploits the fundamental transition of YDF at 1120nm, even without any external intervention for suppressing ASE in the short wavelength range.
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