We report an efficient, high-power, cw, laser source based on a diode-pumped Nd:YAG laser and a periodically poled lithium niobate (PPLN) frequency converter. This device integrates two separate frequency-conversion steps in a single crystal, taking advantage of the ability to fabricate PPLN with nearly arbitrary grating periods and phase-matching temperatures. This device uses a single PPLN crystal that has two grating regions in series. The first region quasi-phase matches a standard optical parametric oscillator process (), and the second region quasi-phase matches a sum-frequency process whereby the pump and the signal light make red light (). Using a four-mirror ring cavity, we were able to convert 21% of the pump to output, yielding of red output with of input.
© 1998 Optical Society of AmericaFull Article | PDF Article
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