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[摘要]：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 similar to 0.15 mrad (approximately five times the diffraction limit), and high misalignment tolerance similar to 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 (similar to 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 similar to 70% of 50-W maximum set power of the laser. In the DCCER configuration, laser power achieved is about similar to 37 W (75% of 50-W laser power) with beam divergence of about 0.17 mrad and misalignment tolerance of similar to 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). (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3487746] |
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