52W kHz-linewidth low-noise linearly-polarized all-fiber single-frequency MOPA laser

摘要

An all-fiber Yb-doped kHz-linewidth low-noise linearly polarized single-frequency masteroscillator power-amplifier (MOPA) laser with a stable CW output power of >52W is demonstrated. By suppressing the intensity noise of the DBR phosphate fiber oscillator, the linewidth of MOPA laser is not noticeably broadened, and an ultra-narrow linewidth of <3 kHz is obtained. Furthermore, the low-noise behavior of MOPA lasers is investigated. A measured relative intensity noise of < -130 dB Hz(-1) at frequencies of over 2 MHz, a phase noise above 1 kHz of <5 mu rad/Hz1/2, and a signal-to-noise ratio of >63 dB are achieved.