1.5 μm Band Single Frequency Fiber Laser

In terms of high-power continuous single-frequency laser output, in 2016, the MOPA structure can be used to amplify the single-frequency fiber laser seed source. Doped double-clad fiber, a 1560 nm continuous single-frequency laser output with a power of 207 W and a slope efficiency of 50.5% was obtained. This is the highest power of the single-frequency laser based on the MOPA structure in the 1.5 μm band that has been reported so far. The experimental schematic diagram and power curve diagram are shown in Figure 4 and Figure 5, respectively.

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Schematic diagram of high power single frequency Er3+/Yb3+ co-doped fiber amplifier

Output power curve of high power EYDFA pumped at 940 nm

In terms of single-frequency laser noise suppression, the MOPA structure composed of two-stage fiber amplifiers can be used to amplify the single-frequency fiber laser seed source that has been suppressed by intensity noise, and a low-noise 1550 with a power of 23 W and a linewidth of less than 1.7 kHz can be achieved. nm continuous single-frequency laser output, its relative intensity noise in the 0.1-50 MHz frequency band is as low as -150 dB/Hz@0.5 mW, which is close to the limit of quantum noise.