Fig. 1. Experimental setup of tunable optical parametric oscillator

Fig. 2. (a) Output spectra and power of signal light; (b) output power under different cavity lengths (inserts are spectra under different cavity lengths)

Fig. 3. Power stability of signal light. (a) 144 mW; (b) 92 mW

Fig. 4. Spectrum and central wavelength stability of signal light. (a)(b) 144 mW; (c)(d) 92 mW

Fig. 5. Schematic of OPOs output stability with proportional-integral controller

Fig. 6. (a) Experimental setup of wavelength stabilization; (b) experimental setup of power stabilization

Fig. 7. Output power stability results of different stabilizing methods. (a) Power stabilization; (b) wavelength stabilization

Fig. 8. Wavelength stability results of different stabilizing methods with power of 144 mW. (a)(b) Power stabilization; (c)(d) wavelength stabilization (insert is initial spectra before stabilization)