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Optical Engineering

Performance of hybrid, diffraction, and continuously coupled cat-eye resonators with kinetically enhanced copper vapor lasers
Author(s): Bijendra Singh; V. V. Subramaniam; Shankar R. Daultabad; Dharmraj V. Ghodke; Ashim Chakraborty
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Paper Abstract

New resonators, namely the hybrid cat-eye resonator (HCER), diffraction-coupled cat-eye resonator (DCCER), and continuously coupled cat-eye resonator (CCCER) are demonstrated for the first time here in a kinetically enhanced copper vapor laser with high optical extraction of 70 to 80%, low beam divergence ~0.15 mrad (approximately five times the diffraction limit), and high misalignment tolerance ~5 to 6 mrad achieved simultaneously from each of these configurations. The laser used in the experiment is a 45- to 47-mm bore, 50-W kinetically enhanced copper vapor laser. In the case of HCER, the laser beam divergence reduces to about 0.12 mrad (~30-fold reduction) in an unstable direction and about 0.5 mrad (approximately seven-fold reduction) in a stable direction with average beam power of about 35 W, which is ~70% of 50-W maximum set power of the laser. In the DCCER configuration, laser power achieved is about ~37 W (75% of 50-W laser power) with beam divergence of about 0.17 mrad and misalignment tolerance of ~5 mrad. In CCCER, the output power of about 40 W (80% of 50-W laser power) is achieved with beam divergence of about 0.1 mrad (approximately three to four times the diffraction limit).

Paper Details

Date Published: 1 September 2010
PDF: 12 pages
Opt. Eng. 49(9) 091011 doi: 10.1117/1.3487746
Published in: Optical Engineering Volume 49, Issue 9
Show Author Affiliations
Bijendra Singh, Raja Ramanna Ctr. for Advanced Technology (India)
V. V. Subramaniam, Raja Ramanna Ctr. for Advanced Technology (India)
Shankar R. Daultabad, Raja Ramanna Ctr. for Advanced Technology (India)
Dharmraj V. Ghodke, Raja Ramanna Ctr. for Advanced Technology (India)
Ashim Chakraborty, Raja Ramanna Ctr. for Advanced Technology (India)


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