Ultrafast two-photon nonlinearities in CdSe near 1.5 μm studied by interferometric autocorrelation

Author

Schucan, Gian-Mattia ; Ispasoiu, Radu G. ; Fox, A. Mark ; Ryan, John F.

Author_Institution

Dept. of Phys., Oxford Univ., UK

Volume

34

Issue

8

fYear

1998

fDate

8/1/1998 12:00:00 AM

Firstpage

1374

Lastpage

1379

Abstract

We have used interferometric autocorrelation measurements to study the femtosecond nonlinear optical properties of bulk CdSe crystals in the wavelength region just above the half gap wavelength of 1.42 μm. Between 1.42 and 1.55 μm, we measured an ultrafast third-order nonlinearity with nonlinear refractive index n₂=1.3×10 ^-13 cm²/W^-1. Detailed modeling of the autocorrelations revealed the influence of higher order effects due to free carriers generated by nonlinear absorption. We find that CdSe is an interesting alternative material to AlGaAs for applications in this technologically important wavelength region

Keywords

II-VI semiconductors; cadmium compounds; infrared spectra; light interferometry; optical correlation; refractive index; two-photon spectra; 1.42 to 1.55 mum; 1.5 mum; CdSe; bulk CdSe crystals; femtosecond nonlinear optical properties; free carrier generation; half gap wavelength; interferometric autocorrelation; nonlinear absorption; nonlinear refractive index; technologically important wavelength region; ultrafast third-order nonlinearity; ultrafast two-photon nonlinearities; wavelength region; Absorption; Autocorrelation; Crystals; Nonlinear optics; Optical interferometry; Optical refraction; Optical variables control; Refractive index; Ultrafast optics; Wavelength measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.704323

Filename

704323