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Proceedings Paper

An Apparatus For Wide Range Feedback Control Of ND:YAG Laser Pulse Energy
Author(s): J. A. Penkethman
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Paper Abstract

The ARACOR Model 4100XPL semiconductor test instrument delivers a train of Nd:YAG Q-Switched laser pulses at 10 Hz whose energies are selectable over 5 orders of magnitude by user data entry. Each pulse has the same energy within 5%. To achieve this, a feedback controlled beam attenuator module was designed with a bandwidth of about 1 Hertz. The beam is thereby also stabilized against thermal drift and performance degradation of the laser. A microprocessor monitors the beam energy via a Brewster window pick-off, photodiode and related electronics. This feedback is then used to position the beam attenuator module. Excellent control is achieved without adding noticeably to the normal pulse to pulse variations of the laser via a control law which avoids excessive servoing about the desired pulse energy.

Paper Details

Date Published: 1 January 1987
PDF: 6 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967427
Show Author Affiliations
J. A. Penkethman, Advanced Research and Applications Corporation (United States)


Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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