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首页> 外文期刊>Optical fiber technology >Compact THz time-domain spectroscopy based on pre-chirped pulses from mode-locked Yb-doped fiber laser
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Compact THz time-domain spectroscopy based on pre-chirped pulses from mode-locked Yb-doped fiber laser

机译：基于锁模掺Yb光纤激光器的预chi脉冲的紧凑THz时域光谱

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摘要

We report on a compact terahertz (THz) time-domain spectroscopy (TDS) system based on fiber-integrated logspiral low-temperature-grown InGaAs photo-conductive antenna (PCA) modules pumped by pre-chirped pulses from a 1.03-mu m mode-locked Yb-doped fiber laser. A mode-locked Yb-doped fiber laser based on a birefringent spectral filter was produced with 240 mW average output power and 2.68-ps pulse duration. The output pulse had high chirp because the mode-locked fiber laser was implemented in the normal dispersion region. Therefore, the 733-fs output pulse was pre-chirped using two parallel diffraction gratings to facilitate its use as an optical pump source with THz radiation. After propagating in the single-mode fiber, the pulse-width of the pre-chirped pulse was compressed to 331 fs and injected into fiber-integrated PCA modules to generate a THz wave. We successfully obtained a THz emission bandwidth of over 2.5 THz for 120 mm in free space using the compact THz measurement setup. THz radiation was achieved by easily aligning two fiber integrated PCA modules. Absorption lines for water vapor were observed at room temperature. We also observed absorption lines from a 30% a-lactose sample. We confirmed that the fiber-integrated PCA modules and mode-locked Yb-doped fiber laser have potential applications in compact and portable THz-TDS systems.
机译：我们报告了一个紧凑的太赫兹（THz）时域光谱（TDS）系统，该系统基于光纤集成的对数螺旋低温生长的InGaAs光导天线（PCA）模块，该模块由1.03微米模式的预chi脉冲泵浦锁定掺b光纤激光器。产生了基于双折射光谱滤波器的锁模掺Yb光纤激光器，其平均输出功率为240 mW，脉冲持续时间为2.68 ps。由于锁模光纤激光器是在正常色散区域实现的，因此输出脉冲具有较高的chi声。因此，使用两个平行衍射光栅对733-fs输出脉冲进行了预线性调频，以利于将其用作具有THz辐射的光泵浦源。在单模光纤中传播后，预-脉冲的脉冲宽度被压缩至331 fs，并注入集成光纤的PCA模块中以产生THz波。使用紧凑的THz测量设置，我们成功地在120 mm的自由空间中获得了超过2.5 THz的THz发射带宽。通过轻松对准两个光纤集成的PCA模块可以实现THz辐射。在室温下观察到水蒸气的吸收线。我们还观察到了30％α-乳糖样品的吸收谱线。我们确认，集成光纤的PCA模块和锁模掺Yb光纤激光器在紧凑和便携式THz-TDS系统中具有潜在的应用。

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