Investigation of second- and third-harmonic generation in few-layer gallium selenide by multiphoton microscopy

Lasse Karvonen, Antti Säynätjoki, Soroush Mehravar, Raul D. Rodriguez, Susanne Hartmann, Dietrich R.T. Zahn, Seppo Honkanen, Robert A. Norwood, N. Peyghambarian, Khanh Kieu, Harri Lipsanen, Juha Riikonen

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Gallium selenide (GaSe) is a layered semiconductor and a well-known nonlinear optical crystal. The discovery of graphene has created a new vast research field focusing on two-dimensional materials. We report on the nonlinear optical properties of few-layer GaSe using multiphoton microscopy. Both second- and third-harmonic generation from few-layer GaSe flakes were observed. Unexpectedly, even the peak at the wavelength of 390 nm, corresponding to the fourth-harmonic generation or the sum frequency generation from third-harmonic generation and pump light, was detected during the spectral measurements in thin GaSe flakes.

Original languageEnglish
Article number10334
JournalScientific Reports
Publication statusPublished - 19 May 2015
Externally publishedYes


ASJC Scopus subject areas

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