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The variable focal length of thermal lensing in grains of a thermally loaded Nd:YAG crystal rod have been calculated and compared with the measurements of our system. By use of the space-dependent rate equations, the analytical expression of the output power on the pump power, which consists of the factors of threshold volume and the focal length of thermal lensing, is presented. We investigate the threshold pump power, and the relationships between the output power and the pumping power under different lengths of thermal lensing. Experimental results concerning the output power of fundamental mode and the pump power, which are related to the thermal lensing and agreeable to the theoretical analysis are given. Finally, the optimized experimental output power of our laser system is obtained. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 361–365, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20305 [ABSTRACT FROM AUTHOR]

The differential equations describing discharge circuitry are presented. The thyratron resistance with a switching time coefficient τs is investigated. The plasma conductivity used in these differential equations is estimated using the available data on plasma parameters. The discharge current profile of numerical simulation is found to be in close agreement with the experimental data. In this way, the factors which affect the short rise time to increase lasing ability in the CVL (copper–vapor laser) are studied. As a calculation result, the inductance of the laser head is subordinate to the thyratron circuit inductance in terms of the effect on the discharge current rise time. Very good agreement exists between the calculated and measured results. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 17: 402–405, 1998. [ABSTRACT FROM AUTHOR]