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The development of various types of CO2 lasers has been spectacular. The first reported laser had a continuous output power of only a few milliwatts [1.1,2]. Nowadays continuous lasers are built with output powers of more than 20kW [1.3]. For pulsed systems it started in 1968 with a few joules [1.4]. These developments, especially stimulated by the large laser-fusion projects, have led to huge systems in the range of 100 kJ. Not only the pulse energy but also its time profile has been intensively studied. The search for pulse-compression technology has resulted to pulse durations of less than one picosecond [1.5].
KeywordsWaste Heat Pulse System Unstable Resonator Fresnel Number Unstable Configuration
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