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报道了利用脉宽可调的光子晶体光纤飞秒激光放大器抽运矩形波导结构的GaP晶体太赫兹(THz)发射器产生频率可调谐的超快THz脉冲,非线性晶体中光整流过程产生的THz辐射频率随抽运光脉冲宽度而变化.GaP波导THz发射器可通过波导的儿何尺寸来控制色散,以达到增加有效作用长度和提高输出功率的目的.不同横截而尺寸的波导型发射器的THz辐射峰值频率随相位匹配条件的改变而改变,加以脉宽调节技术,可以在大频谱范围获得频谱精细可调的THz脉冲.实验中在1 mm×0.7 mm的波导型THz发射器中获得了频率可调谐的THz脉冲.提出实现THz辐射频率大范围调谐的GaP波导型阵列发射器的实施方案.
Reported the use of pulse width adjustable photonic crystal fiber femtosecond laser amplifier pumping rectangular waveguide structure of GaP crystal terahertz (THz) transmitter to generate frequency tunable ultra-fast THz pulse nonlinear optical rectification process generated THz The radiation frequency varies with the pulse width of the pumping light.GaP waveguide The THz emitter can be controlled by the waveguide size to achieve the purpose of increasing the effective length and increasing the output power.Transmitter with different cross-sectional dimensions The peak frequency of THz radiation changes with the change of phase matching condition and the pulse width modulation technique can be used to obtain the finely tunable THz pulse in the large spectrum.The experimental results are obtained in a 1 mm × 0.7 mm waveguide type THz emitter A tunable THz pulse is proposed An embodiment of a GaP waveguide type array transmitter for tuning a wide range of THz radiation frequencies is proposed.