Title :
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
fDate :
8/1/1998 12:00:00 AM
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;
Journal_Title :
Quantum Electronics, IEEE Journal of
