Terahertz emission from coherent phonons in lithium ternary chalcopyrite crystals illuminated by 1560 nm femtosecond laser pulses

K. Takeya; Y. Takemoto; I. Kawayama; H. Murakami; T. Matsukawa; M. Yoshimura; Y. Mori; M. Tonouchi

doi:10.1209/0295-5075/91/20004

All issues

Volume 91 / No 2 (July 2010)

EPL, 91 2 (2010) 20004

Abstract

Issue		EPL Volume 91, Number 2, July 2010


Article Number		20004
Number of page(s)		4
Section		General
DOI		https://doi.org/10.1209/0295-5075/91/20004
Published online		04 August 2010

EPL, 91 (2010) 20004

Terahertz emission from coherent phonons in lithium ternary chalcopyrite crystals illuminated by 1560 nm femtosecond laser pulses

K. Takeya¹^a, Y. Takemoto¹, I. Kawayama¹, H. Murakami¹, T. Matsukawa², M. Yoshimura², Y. Mori² and M. Tonouchi¹

¹ Institute of Laser Engineering, Osaka University - 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
² Graduate School of Engineering, Osaka University - 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

^a takeya-k@ile.osaka-u.ac.jp

Received: 14 June 2010
Accepted: 13 July 2010

Abstract

We have investigated terahertz (THz) emission from lithium ternary chalcopyrite crystals LiInSe₂, LiGaSe₂, LiInS₂, and LiGaS₂ that were illuminated by 1560 nm femtosecond pump laser pulses. Monocyclic THz emission caused by nonlinear optical effects was initially observed in all the illuminated crystals. Narrow-band THz emission from the coherent phonons were observed in LiInSe₂ (2.87 THz) and LiGaSe₂ (2.60 and 3.45 THz). These phonon modes were most likely caused by impulsive stimulated Raman scattering.

PACS: 07.57.Pt – Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques / 42.70.Mp – Nonlinear optical crystals / 63.20.K- – Phonon interactions

© EPLA, 2010

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