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Three-octave terahertz pulses from optical rectification of 20 fs, 1 μm, 78 MHz pulses in GaP

: Xu, J.; Globisch, B.; Hofer, C.; Lilienfein, N.; Butler, T.; Karpowicz, N.; Pupeza, I.

Fulltext ()

Journal of Physics. B, Atomic, molecular and optical physics 51 (2018), No.15, Art. 154002, 5 pp.
ISSN: 0022-3700
ISSN: 0953-4075
ISSN: 1361-6455
Journal Article, Electronic Publication
Fraunhofer HHI ()

We demonstrate optical rectification of 1 μm pulses with a duration of 20 fs, a repetition-rate of 78 MHz and an average power of 5.5 W, in a 2 mm thick GaP crystal. The spectrum of the resulting far-infrared pulses is centered at 1.5 THz and extends to 5 THz at −50 dB intensity. In the absence of resonant absorption of GaP in this range, the spectrum has a well-behaved shape, facilitating spectroscopic applications. In the context of the recent rapid evolution of high-power Yb-based femtosecond laser systems, these results show a viable route towards sources of THz pulses combining broad bandwidth, high average power and a smooth spectral shape.