Night Vision monitor for IR laser spot size Identification

M.T.Hussein,

	Night Vision monitor for IR laser spot size Identification
Iraqi Journal of Physics
Article 1, Volume 8, Issue 12, 2010, Pages 42-49
Author

Abstract
The aim of this research is to design and construct a semiconductor laser range finder operating in the near infrared range for ranging and designation. The main part of the range finder is the transmitter which is a semiconductor laser type GaAs of wavelength 0.904 μm with a beam expander and the receiver; a silicon pin detector biased to approve the fast response time with it's collecting optics. The transmitters pulse width was 200ns at a threshold current of 10 Ampere and maximum operating current of 38 Ampere. The repetition rate was set at 660Hz and the maximum operating output power was around 1 watt. The divergence of the beam was 0.268o the efficiency of the laser was 0.03% at a duty cycle of 1.32x10-4. Special software (ZEMAX EE 2000) was implemented for optimum optical design. The transmission and reflection of the laser pulse spot size were observed and detected by a Night Vision Monitor of second generation with fast digital camera. The Mat lab software used is capable of analyzing and displaying the profile in 4 different methods that is , color code intensity contouring , intensity threshold , intensity cross section along two dimensions x-y and three dimensional plot of the beam intensity given in the same display. The atmospheric attenuation for this semiconductor laser was also calculated using Low- Tran .6 code, which indicated that negligible attenuation is recorded below 2 Km range for ג=0.904 µm
Keywords
GaAs laser spot size; Night vision

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