THz emission from coherently controlled photocurrents in GaAs

被引：63

作者：

Coté, D

Fraser, JM

DeCamp, M

Bucksbaum, PH

van Driel, HM

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 25期

关键词：

D O I：

10.1063/1.125531

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report broadband terahertz radiation from ballistic photocurrents generated 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 mu W (775 nm), we measure 3 nW of THz power, limited mainly by phase walkoff of the optical beams within the 1.5-mu m-thick sample and collection efficiency. (C) 1999 American Institute of Physics. [S0003-6951(99)01751-9].

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页码：3959 / 3961

页数：3

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