Photogalvanic effect in GaP with ultrashort laser pulses
Photogalvanic effect is the effect that generates current without external field in noncentrosymmetric materials. We research photogalvanic effect induced by femto-second light pulses in undoped GaP crystal.
We observed pulsed current by illuminating GaP crystal with 800nm(center wavelength) femto-second light pulses, and we confirmed that observed current is generated by photogalvanic effect by measuring polarization and intensity dependence of the current. Relaxation time of photogalvanic current is obviously faster than that of photocurrent.
Fig.1: The experimental arrangement of photogalvanic current detection.
- I. Yoshimine, A. A. Kamshilin, R. Fujimura, T. Satoh, T. Shimura, and K. Kuroda
Linear photogalvanic current in GaP crystals excited by femtosecond pulses
The Ninth Japan-Finland Joint Symposium on Optics in Engineering (2011.9.7-11, Turku, Finland)
- I. Yoshimine, A. A. Kamshilin, R. Fujimura, T. Satoh, K. Kuroda, and T. Shimura
Coherence length of femtosecond laser pulses measured by photogalvanic currents in Gallium Phosphide
Photorefractve Materials, Effects and Devices, Light in Nonlinear Structured Materials P1 (2011.10.13-15, Ensenada, Mexico)