Title :
n-GaAs thermo-voltage detector for short and powerful CO2 laser pulses
Author :
Vounckx, R. ; Kotov, V. ; Shkerdin, G. ; Borghs, G. ; Stiens, J.
Author_Institution :
Dept. of Electron., Vrije Univ., Brussels, Belgium
Abstract :
Conceiving detectors, which can monitor the spatial and temporal beam distribution of (sub)-ns and powerful (> 1 MWcm-2) CO2 laser pulses without optical attenuation and electrical amplification is a challenging issue. We present theoretical and experimental results of our novel detector based on optically induced electron temperature gradients in resonant plasmas in n-GaAs. We measured a responsivity up to 8 mV/MWcm-2 at optical power levels in the range from 1 to 100 MWcm-2 where other detectors strongly degrade or even fail.
Keywords :
III-V semiconductors; gallium arsenide; gas lasers; high-speed optical techniques; laser beams; laser variables measurement; optical sensors; semiconductor plasma; thermoelectricity; CO2; CO2 laser pulses; GaAs; optical power levels; optically induced electron temperature gradients; resonant plasmas; responsivity; spatial beam distribution; temporal beam distribution; thermo-voltage detector; Electron optics; Gas detectors; Laser beams; Laser theory; Monitoring; Optical attenuators; Plasma measurements; Plasma temperature; Power lasers; Stimulated emission;
Conference_Titel :
Optoelectronic and Microelectronic Materials and Devices, 2002 Conference on
Print_ISBN :
0-7803-7571-8
DOI :
10.1109/COMMAD.2002.1237190
