Near-infrared laser pumped intersubband THz laser gain in InGaAs-AlAsSb-InP quantum wells

Ansheng Liu, Cun-Zheng Ning

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Abstract

We investigate the possibility of using InGaAs-AlAsSb-InP coupled quantum wells to generate THz radiation by means of intersubband optical pumping. We show that large conduction band offsets of these quantum wells make it possible to use conventional near-infrared diode lasers around 1.55 μm as pump sources. Taking into account the pump-probe coherent interaction and the optical nonlinearity for the pump field, we calculate the THz gain of the quantum well structure. We show that resonant Raman scattering enhances the THz gain at low and moderate optical pumping levels. When the pump intensity is strong, the THz gain is reduced by pump-induced population redistribution and pump-probe coherent interactions.

Original languageEnglish (US)
Pages (from-to)1984-1986
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number15
Publication statusPublished - Apr 10 2000
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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