The emergence of new, efficient, nonlinear crystals and the development of passively mode-locked, solid state lasers, such as the Kerr-lens mode-locked Ti:sapphire laser, has rekindled interest in optical parametric oscillators (OPOs) while opening up new regions of the spectrum to high repetition rate, high average power femtosecond pulses. With synchronous pumping techniques it is now possible to generate pulses as short as 40 fs for (nominally) 1 $LS $lambda $LS 4 $mu@m, at repetition rates of 10$+8$/ Hz, and with average powers measured in 100s of mW. Tuning can be achieved in critically or non-critically phase- matched KTP or LBO via crystal angle, temperature or pump wavelength tuning each of which has its merits in terms of tuning range, ease of use, noise properties, etc.
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机译：新的，高效，非线性晶体和被动模式锁定，固态激光器的发展，例如克尔镜头模式锁定的Ti：蓝宝石激光，在开放新的时，在光学参数振荡器（OPOS）中重新推出了兴趣频谱区域高重复率，高平均功率飞秒脉冲。通过同步泵浦技术，现在可以以10美元+ 8美元/ Hz的重复率和测量的平均力量来生成短至40 fs的脉冲（名义上）1 $ ls $ ls $ 4 $ mu @ m。在100多人的兆瓦。调谐可以通过晶体角度，温度或泵波长调谐，每个晶角，温度或泵波长调谐可以在调谐范围，易用性，噪声属性等方面具有其优点。
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