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Proceedings Paper

Design of a QCW laser diode driver for space-based laser transmitter
Author(s): Ravindra Singh; Nishma Dangwal; . Chandraprakash; Lalita Agrawal; Suranjan Pal; J. A. Kamlakar
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Paper Abstract

LASTEC Delhi in a joint collaborative activity with LEOS, Bangalore is developing a space qualified diode array pumped Nd:YAG laser transmitter delivering 30 mJ @ 10 pps of 10 ns duration. For space applications laser diodes are preferred because of their excellent reliability with lifetimes exceeding 100,000 hours. However, they are extremely sensitive to electro-static discharge, excessive current levels, and current spikes and transients. Small variations in bias voltage may produce large fluctuations in the current causing instability and damage to the device. Hence instead of the traditional power supplies a current controlled laser diode driver is required. This paper presents the design of a Q-CW laser diode driver based on closed loop current regulator, capable of driving 24 QCW laser diode bars each with 75W peak power at 70 A. The driver can generate up to 100 Amp peak current and 200μsec pulse width operating at 10 Hz. The current source design includes special circuits for low noise operation, slow turn-on and turn-off, circuits for over voltage and transient current protection; and good regulation. Space qualified and radiation hardened components are required to be used to sustain stringent space environment requirements during mission life of two years.

Paper Details

Date Published: 22 December 2006
PDF: 6 pages
Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64091F (22 December 2006); doi: 10.1117/12.694397
Show Author Affiliations
Ravindra Singh, Laser Science and Technology Ctr. (India)
Nishma Dangwal, Laser Science and Technology Ctr. (India)
. Chandraprakash, Laser Science and Technology Ctr. (India)
Lalita Agrawal, Laser Science and Technology Ctr. (India)
Suranjan Pal, Laser Science and Technology Ctr. (India)
J. A. Kamlakar, Lab. for Electro-Optics Systems, Peenya Industrial Estate (India)


Published in SPIE Proceedings Vol. 6409:
Lidar Remote Sensing for Environmental Monitoring VII
Upendra N. Singh; Toshikazu Itabe; D. Narayana Rao, Editor(s)

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