Widely tunable second harmonic amplification by noncollinear phase matching in bulk birefringent materials
Widely tunable second harmonic amplification by noncollinear phase matching in bulk birefringent materials
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DOI：
10.1117/12.2584661
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发表时间：
2021-03
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影响因子：
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通讯作者：
Devin J Dean;Noah Flemens;Dylan Heberle;J. Moses
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作者：
Devin J Dean;Noah Flemens;Dylan Heberle;J. Moses
二次谐波放大——光学参量放大和二次谐波生成的混合——是实现超高效参量放大的途径。由于需要两个参量波混合过程同时进行相位匹配，因此它在体介质中的共线几何结构中的频率覆盖范围有限。在这里，我们表明，在设计用于适应由固态激光器产生的高能皮秒脉冲的应用中，非共线双折射相位匹配可以在 ZnGeP2、CdSiP2、LiNbO3、β-BaB2O4 和 KD2PO4 材料中提供近红外和中红外二次谐波放大的宽频率可调性。我们讨论了实际限制，包括接受角、相位匹配带宽、空间走离和寄生过程。
Second harmonic amplification - a hybridization of optical parametric amplification and second harmonic generation - is a route to ultra-efficient parametric amplification. Requiring the simultaneous phase matching of two parametric wave-mixing processes, it has limited frequency coverage in the collinear geometry in bulk media. Here we show that noncollinear birefringent phase matching can provide wide frequency tunability of second harmonic amplification across the near- and mid-infrared in the materials ZnGeP2, CdSiP2, LiNbO3, β - BaB2O4, and KD2PO4 in applications designed for accommodating high-energy picosecond pulses generated by solid state lasers. We discuss practical limitations including acceptance angle, phase-matching bandwidth, spatial walk off, and parasitic processes.