Femtosecond three-pulse photon echo and transient grating studies of the yellow band of GaN

Author

Van Dao, Lap ; Lowe, Martin ; Hannaford, Peter

Author_Institution

Sch. of Biophys. Sci. & Electr. Eng., Swinburne Univ. of Technol., Melbourne, Vic., Australia

fYear

2002

fDate

11-13 Dec. 2002

Firstpage

289

Lastpage

292

Abstract

Using femtosecond three-pulse two-colour photon echo measurements we study the optical nonlinearity induced by pump and probe in the short time scale (< 500 fs) where the free induction decay and photon echo are the main contribution to observed signal and in a long time scale (up to 20 ps) in the trace of the population grating. The variation of the pump and probe wavelength and use of spectrally resolved measurements allows us to study the origin of the yellow band and the phase and energy relaxation properties of this band. The results suggest that the light emission in the yellow band is the recombination between shallow donors and deep acceptors and the carriers trapping time is very short.

Keywords

III-V semiconductors; electron traps; gallium compounds; high-speed optical techniques; impurity states; nonlinear optics; photon echo; visible spectra; 20 ps; GaN; carriers trapping; deep acceptors; energy relaxation properties; femtosecond three-pulse photon echo; femtosecond three-pulse two-colour photon echo measurements; free induction decay; light emission; optical nonlinearity; phase properties; population grating; probe wavelength; pump wavelength; shallow donors; spectrally resolved measurements; transient grating studies; yellow band; Energy measurement; Energy resolution; Gallium nitride; Gratings; Optical pumping; Phase measurement; Probes; Signal resolution; Time measurement; Ultrafast optics;

fLanguage

English

Publisher

ieee

Conference_Titel

Optoelectronic and Microelectronic Materials and Devices, 2002 Conference on

ISSN

1097-2137

Print_ISBN

0-7803-7571-8

Type

conf

DOI

10.1109/COMMAD.2002.1237248

Filename

1237248