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Enhancement of CW THz Wave Power Under Noncollinear Phase-Matching Conditions in Difference Frequency Generation

机译：非共线相位匹配条件下差频产生中CW THz波功率的增强

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摘要

We investigated methods for improvement of continuous-wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that an output power of 4 nW was obtained with a 20 mm long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was dominant for longer GaP crystals at high frequencies (above 2.5 THz). The THz wave power dependence on beam spot size (1.2 mm-300 mum) of near-IR lasers at 1.62 THz was studied, and an improvement of THz wave power being seen with a 500 mum beam spot size, while the beam divergence effect was dominant for beam spot sizes below 500 mum.
机译：我们研究了在非共线相位匹配差分频率产生（DFG）中通过激光二极管（LD）抽运来改善连续波（CW）太赫兹（THz）输出功率的方法。研究了GaP晶体中输入激光的相互作用长度和光斑尺寸（近红外）的影响。研究了太赫兹波功率对各种尺寸的GaP晶体的依赖性，观察到在20毫米长的GaP晶体在1.5 THz时可获得4 nW的输出功率。同样，太赫兹波吸收系数在高频（高于2.5太赫兹）下对于较长的GaP晶体也很重要。研究了在1.62 THz时THz波功率对近红外激光束斑尺寸（1.2 mm-300 mum）的依赖性，并且在500 mum束斑尺寸下可以看到THz波功率的提高，而光束发散效应为小于500毫米的束斑尺寸占主导地位。

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