2~5μm中红外飞秒光学参量振荡器研究进展(特邀)

Research progress of 2-5μm mid-IR femtosecond optical parametric oscillator(Invited)

自1994年首次利用克尔透镜锁模钛宝石激光器泵浦RTA光学参量振荡器实现中红外飞秒激光输出以来,在这20多年的时间内,随着高功率近红外泵浦源与各种优质非线性晶体的不断涌现,中红外飞秒光学参量振荡器在平均功率、脉冲宽度、调谐范围等方面都取得了长足的发展,为基础科学研究、生物医疗以及国防安全等领域提供了多样化的应用工具。文中将2~5μm中红外飞秒光学参量振荡器分为波长可调谐输出型与宽光谱输出型两类,分别重点就这两类中红外飞秒光学参量振荡器的国内外研究进展进行综述,最后对进一步发展趋势进行了展望。高功率、高光束质量中红外飞秒光学参量振荡器和大能量中红外飞秒光学参量振荡器是其中两个重要的发展方向。

Since the first use of Kerr lens mode-locked Ti: sapphire laser pumped RTA optical parametric oscillator to achieve mid-infrared femtosecond laser in 1994, with the continuous emergence of high-power nearinfrared pump sources and various high-quality nonlinear crystals, the mid-infrared femtosecond optical parametric oscillator had made considerable progress in terms of average power, pulse width, and tuning range in the past two decades, providing diverse application tools for basic scientific research, biomedicine, and national defense security. Mid-infrared femtosecond optical parametric oscillators were divided into two types in this paper: wavelength tunable output type and broadband-spectrum output type. The research progress of these two types of 2-5 μm mid-infrared femtosecond optical parametric oscillators at home and abroad were reviewed respectively. Finally, the further development trend was discussed. In view of the outlook, high-power, high-beam quality mid-infrared femtosecond optical parametric oscillators and high-energy mid-infrared femtosecond optical parametric oscillators are two important development directions.