Nonlinear optical effects in diode-pumped active media
Krzysztof Kopczyński , Zdzisław Jankiewicz , Zygmunt Mierczyk , Mirosław Kwaśny , Michał Borecki
AbstractSelectivity diode pumping of rare earth-doped solid state lasers show important differences between broad-band frequency lamp pumping and monochromatic diode pumping. In such a process all effects of up-conversion and excited state absorption should be taken into account. Experiments at room temperature were carried out to study the higher order processes that produced the orange, yellow, green and blue fluorescence in diode pumped solid state lasers and micro lasers with the high pump power density up to 30 kW/cm2. These higher order processes were energy transfer up-conversion and excited state absorption of both pump and laser radiation. Such type of a process may be an important loss mechanism for monochromatic pumping of laser. Energy transfer up conversion reduces the population of the upper laser level, effectively shortened its lifetime. Additional heat deposition increases strongly under non lasing conditions. Attributed to up-conversion and ESA there is a significant different in thermal lens power between lasing and non-lasing conditions. Generation of heat in the laser medium is a fundamental problem which ultimately sets limits on the maximum operating power.
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|Book||Woliński Wiesław, Jankiewicz Zdzisław (eds.): Proceedings of SPIE Laser Technology VI: Progress in Lasers, vol. 4237, 2000, 1000 20th St. Bellingham WA 98225-6705 USA, SPIE, ISBN 9780819439116, 256 p.|
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