kHz、mJ量级的可调谐MgO∶PPLN中红外光参量振荡器

Abstract

Objective Nanosecond midinfrared lasers with central wavelengths of 3 -5 µm are used in various applications, such as environmental monitoring, LIDAR , and electrooptical countermeasures, owing to the high atmospheric transmission at this band.Thus, developing highenergy midinfrared laser sources with high pulse repetition frequencies is crucial for practical applications because such lasers exhibit superior jamming effects and can effectively target an opponent's antijamming mechanism. An optical parametric oscillator (OPO) is suitable for efficiently realizing a tunable, highpulserepetitionfrequency laser owing to its compactness, wide tuning range, and high conversion efficiency. The output characteristics of an OPO are primarily determined by the optical properties of the constituent nonlinear crystals. Among the various nonlinear crystals used in OPOs, periodically poled magnesiumoxidedoped lithium niobate (MgO∶PPLN) has attracted considerable attention because of its large effective nonlinear coefficient, high damage threshold, and flexible phase matching ability. However, to date, a pulse energy of the order of hundred