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首页> 外文期刊>Applied optics >Unstable resonator optical parametric oscillator based on quasi-phase-matched RbTiOAsO_(4)
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Unstable resonator optical parametric oscillator based on quasi-phase-matched RbTiOAsO_(4)

机译：基于准相位匹配的RbTiOAsO_（4）的不稳定谐振器光学参量振荡器

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摘要

We demonstrate improved signal and idler-beam quality of a 3-mm-aperture quasi-phase-matched Rb-TiOAsO_(4) optical parametric oscillator through use of a confocal unstable resonator as compared with a plane-parallel resonator. Both oscillators were singly resonant, and the periodically poled RbTiOAsO_(4) crystal generated a signal at 1.56 μm and an idler at 3.33 μm when pumped at 1.064 μm. We compared the beam quality produced by the 1.2-magnification confocal unstable resonator with the beam quality produced by the plane-parallel resonator by measuring the signal and the idler beam M~(2) value. We also investigated the effect of pump-beam intensity distribution by comparing the result of a Gaussian and a top-hat intensity profile pump beam. We generated a signal beam of M~(2)≈7 and an idler beam of M~(2)≈2.5 through use of an unstable resonator and a Gaussian intensity profile pump beam. This corresponds to an increase of a factor of approximately 2 in beam quality for the signal and a factor of 3 for the idler, compared with the beam quality of the plane-parallel resonator optical parametric oscillator.
机译：我们证明了与平面平行谐振器相比，通过使用共聚焦不稳定谐振器，可以改善3mm孔径准相位匹配的Rb-TiOAsO_（4）光学参数振荡器的信号和惰束质量。两个振荡器都是单谐振的，当以1.064μm泵浦时，周期性极化的RbTiOAsO_（4）晶体产生1.56μm的信号和3.33μm的惰轮。通过测量信号和空转光束的M〜（2）值，我们将1.2倍共焦不稳定谐振器产生的光束质量与平面平行谐振器产生的光束质量进行了比较。我们还通过比较高斯强度和顶帽强度分布泵浦光束的结果，研究了泵浦光束强度分布的影响。通过使用不稳定的谐振器和高斯强度分布泵浦光束，我们生成了M〜（2）≈7的信号光束和M〜（2）≈2.5的惰轮光束。与平面平行谐振器光学参量振荡器的光束质量相比，这对应于信号光束质量的约2倍和惰轮因子3的增高。

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