Widely tunable sub-kHz linewidth Tm3+-doped single-frequency fiber laser

摘要

Based on a fiber Fabry-Perot tunable filter and a 3.0 m long unpumped gain fiber for forming dynamic grating, an in-band pumped tunable Tm3+-doped single-frequency fiber laser covering a wavelength tuning range from 1857.01 to 2020.17 nm and a tuning interval of <0.43 nm is demonstrated experimentally. Additionally, the laser linewidths of <500 Hz and the relative intensity noises of < -145 dB Hz(-1) at frequencies over 1 MHz are obtained. To date, it is the broadest wavelength tuning range that has been reported in the 2 mu m region, which is highly competitive in atmospheric detection.

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