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We report a low noise continuous-wave(CW) single-frequency 1.5-μm laser source obtained by a singly resonant optical parametric oscillator(SRO) based on periodically poled lithium niobate(PPLN).The SRO was pumped by a CW single-frequency Nd:YVO_4 laser at 1.06μm.The 1.02 W of CW single-frequency signal laser at 1.5μm was obtained at pump power of 6 W.At the output power of around 0.75 W,the power stability was better than±1.5% and no mode-hopping was observed in 30 min and frequency stability was better than 8.5 MHz in 1 min.The signal wavelength could be tuned from 1.57 to 1.59μm by varying the PPLN temperature.The 1.5-μm laser exhibits low noise characteristics,the intensity noise of the laser reaches the shot noise limit(SNL) at an analysis frequency of 4 MHz and the phase noise is less than 1 dB above the SNL at analysis frequencies above 10 MHz.
We report a low noise continuous-wave (CW) single-frequency 1.5-μm laser source obtained by a singly resonant optical parametric oscillator (SRO) based on periodically poled lithium niobate (PPLN). The SRO was pumped by a CW single-frequency Nd: YVO_4 laser at 1.06 μm. 1.02 W of CW single-frequency signal laser at 1.5 μm was obtained at pump power of 6 W.At the output power of around 0.75 W, the power stability was better than ± 1.5% and no mode-hopping was observed in 30 min and frequency stability was better than 8.5 MHz in 1 min. The signal wavelength could be tuned from 1.57 to 1.59 μm by varying the PPLN temperature. The 1.5-μm laser exhibits low noise characteristics, the intensity noise of the laser reaches the shot noise limit (SNL) at an analysis frequency of 4 MHz and the phase noise is less than 1 dB above the SNL at analysis frequencies above 10 MHz.