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首页> 外文期刊>Optics Letters >High-performance fiber-laser-based terahertz spectrometer
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High-performance fiber-laser-based terahertz spectrometer

机译:高性能基于光纤激光的太赫兹光谱仪

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摘要

We have developed a rapid scanning terahertz (THz) spectrometer based on a synchronized two-fiber-laser system. When the system is set to the asynchronous optical sampling mode, THz spectra extending to 3 THz can be acquired within 1 (mu)s at a signal-to-noise ratio of the electric field of better than 20. Signal averaging results in a dynamic range of more than 60 dB, and frequency components of more than 4 THz can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of 2.5 kHz is demonstrated, making the system versatile for different spectroscopic applications. Finally, we compare the THz emission spectra of a photoconductive switch that is pumped at 780 nm and a nonlinear DAST crystal excited at 1550 nm. We find that the spectral range of the spectrometer is significantly enhanced at higher frequencies, while the dynamic range remains constant.
机译:我们已经开发了一种基于同步双光纤激光系统的快速扫描太赫兹(THz)光谱仪。当系统设置为异步光学采样模式时,可以在1微秒内以大于20的电场信噪比获取扩展到3 THz的THz光谱。信号平均产生动态范围超过60 dB,并且可以检测到超过4 THz的频率分量。当将激光器设置为相同的重复频率时,将演示以2.5 kHz的频率进行电子控制的光学采样,从而使该系统可用于不同的光谱应用。最后,我们比较了在780 nm泵浦的光导开关和在1550 nm激发的非线性DAST晶体的THz发射光谱。我们发现,光谱仪的光谱范围在更高的频率下显着增强,而动态范围保持恒定。

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