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A terahertz time-domain spectroscopy system based on a femtosecond Yb:KGW laser, a narrow-gap semiconductor surface emitter, and a photoconductive detector made from an Si-doped GaBiAs epitaxial layer is demonstrated. The spectral bandwidth of the system is larger than 4 THz, and its dynamical range exceeds 60 dB.
Inspec keywords: gallium compounds; epitaxial layers; solid lasers; submillimetre wave spectroscopy; ytterbium; potassium compounds; high-speed optical techniques; photoconducting devices
Other keywords:
Subjects: Photoelectric devices; Solid lasers; Laser beam modulation, pulsing and switching; mode locking and tuning; Lasing action in other solids; Ultrafast optical techniques; Laser beam modulation, pulsing and switching; mode locking and tuning