Browsing by Author "Zhang, Jing-Yuan"

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Blue-light generating femtosecond wavelength-tunable non-collinear optical parametric amplifier
(2006-03-02)
Pan, Ci-Ling
;
Huang, J. Y.
;
Zhang, Jing-Yuan
;
Lee, Chao-Kuei
The present invention discloses a means of the generation of tunable femtosecond pulses from 380 nm to 465 nm near the degenerate point of a 405-nm pumped type-I BBO non-collinearly phase-matched optical parametric amplifier (NOPA). The tunable UV/blue radiation is obtained from sum frequency generation (SFG) between the OPA output and the residual fundamental beam at 810-nm and cascaded second harmonic generation (SHG) of OPA. With a pumping energy of 75 mJ at 405 nm, the optical conversion efficiency from the pump to the tunable SFG is more than 5% and the efficiency of SHG of the OPA is about 2%.
Generation properties of coherent infrared radiation in the optical absorption region of GaSe crystal
(2006-10-30)
Chen, Ching-Wei
;
Hsu, Yu-Kuei
;
Huang, Jung Y.
;
Chang, Chen-Shiung
;
Zhang, Jing-Yuan
We report a study of the effect of optical absorption on generation of coherent infrared radiation from mid-IR to THz region from GaSe crystal. The infrared-active modes of epsilon-GaSe crystal at 236 cm(-1) and 214 cm(-1) were found to be responsible for the observed optical dispersion and infrared absorption edge. Based upon phase matching characteristics of GaSe for difference-frequency generation (DFG), new Sellmeier equations of GaSe were proposed. The output THz power variation with wavelength can be properly explained with a decrease of parametric gain and the spectral profile of absorption coefficient of GaSe. The adverse effect of infrared absorption on (DFG) process can partially be compensated by doping GaSe crystal with erbium ions. (c) 2006 Optical Society of America.