Abstract
Optical Parametric Oscillators (OPOs) are convenient sources for generating tunable coherent radiation in various spectral domains from the visible to the mid infrared. The development of continuous-wave (CW), singly resonant optical parametric oscillators (SROPOs) relies on the availability of high quality nonlinear materials such as periodically poled crystals. Many applications such as high resolution spectroscopy or the development of quantum information processing techniques using rare-earth ions embedded in solid-state matrices or color centers in diamond would greatly benefit from the development of such single-frequency sources in the visible range. The simplest solution to this issue would be the direct pumping of a SROPO with a widely available 532 nm laser. Then, unfortunately, the non-resonant idler wave lies in the mid infrared (above 4 μm), where common efficient materials such as periodically poled LiNb03 (PPLN) significantly absorb. Recently, periodically poled near stoichiometric LiTa03 (PPSLT) has been shown to exhibit a high nonlinearity, less absorption above 4 μm and a higher damage threshold than PPLN. In a previous work1, we successfully used this crystal to build a SROPO emitting 1.2 W 70-μs-long pulses in the red and pumped in the green. The goal of the work reported here is to investigate the possible operation of such a green-pumped red SROPO in the cw regime and to analyze its spectral purity, tunability, and stability for applications where ultra-high spectral purity is mandatory.
© 2007 IEEE
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