THz emission from coherently controlled photocurrents in GaAs
- 20 December 1999
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 75 (25), 3959-3961
- https://doi.org/10.1063/1.125531
Abstract
We report broadband terahertz radiation from ballisticphotocurrentsgenerated via quantum interference of one- and two-photon absorption in low-temperature-grown and semi-insulating GaAs at 295 K. For 90 fs, 1550 and 775 nm optical pulses, we obtain phase-controllable near-single cycle 4 THz radiation. Higher frequency THz emission should be achievable with shorter pulses. At a 250 kHz repetition rate and average powers of 10 mW (1550 nm) and 400 μ W (775 nm), we measure 3 nW of THz power, limited mainly by phase walkoff of the optical beams within the 1.5- μ m-thick sample and collection efficiency.Keywords
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