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A ring-cavity synchronously-pumped optical parametric oscillator (OPO) is investigated based on periodically poled KTi: OPO4 (PPKTP). The wavelength of the signal wave covers from 1 000 to 1 500 nm, the output power is 32.3 mW, and idler wave spectrum range from 1 800 to 2 500 nm is detected. By inserting a BBO or BIBO crystal respectively, a stable and adjustable range from 450 to 650 nm light is obtained. Three to six wavelengths can be output simultaneously. © 2013 Chinese Optics Letters.
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