Daylight visibility of Laser Beam Eastbourne, October 2005 Daylight Visibility of a kHz - but µJ – Laser Beam.

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Presentation transcript:

Daylight visibility of Laser Beam Eastbourne, October 2005 Daylight Visibility of a kHz - but µJ – Laser Beam

Hardware Setup Eastbourne, October 2005 C-SPAD ISIT-TV SensiCAM Frame Grabber Dichroic Mirror 95% of 532 nm Filter 0.3 nm Video Night only Day/Night Day/Night; 5 % of 532 nm Old CCD (10 Hz & kHz; bigger FOV) 50 cm Main Telescope

SensiCAM - CCD  Eastbourne, October 2005  Problem: Backscatter of Single Shot TOO WEAK (400 µJ)  NOT Visible with CCD...  Solution: Integrate Backscatter of 1000 Shots...  But do NOT Integrate the noise between shots !  => Increases Signal / Noise Ratio ! Laser Pulses 1000 Exposures 50 µs Exposure per Shot; Backscatter image only 1000 Shots integrated; needs 0.5 s / 2 kHz 

 Sensicam 360KF; from PCO Imaging (  Camera type: Interface type: PCI-Board 525 KP (Koax Version)  Programming: via the C++ Package included with the CCD;  Allows now for:  Continuous imaging of backscatter (no mirrors switched);  Uses only about 5% of the backscatter (leakage of dichroic mirror, which separates 532 from other wavelenghts);  Also used for rough visual adjustment of beam divergence...  Future Plans: Automatic Detection of Laser Beam Peak  Automatic Beam Centering with Remote Controlled Mirror (manually adjusted now) CCD used in Graz Eastbourne, October 2005