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Cylindrical zoom optics for high-power diode lasers

: Ehlers, B.; Walz, U.; Heinemann, S.


Scheps, R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Solid state lasers IX. Proceedings : 25 - 26 January 2000, San Jose, California
Bellingham/Wash.: SPIE, 2000 (SPIE Proceedings Series 3929)
ISBN: 0-8194-3546-5
Solid State Lasers Conference <9, 2000, San Jose/Calif.>
Conference Paper
Fraunhofer ILT ()

Today's high power diode lasers achieve spots with dimensions of approximately 1 mm square, delivering intensities breaching 105 W/cm2 and power levels of up to 4 kW. These lasers can be used for a variety of applications from surface treatment to welding. However, each of these applications require different focus sizes to maximize the benefits of the laser source. Therefore, variable cylindrical optics were designed and manufactured in the scope of this work. They create rectangular spot sizes with adjustable aspect ratios. These optics are used in connection with high power diode laser stacks operating in the multiple kilowatt power range. Two different variable optics were used. The first is designed for surface applications such as hardening, cladding and alloying. The spot size varies from 6.0 mm to 22.0 mm in one direction and stays constant at 2.6 mm in the other direction. The second optic exhibits two ranges of continuously variable spot sizes from 1.2 mm to 6 .0 mm and 2.4 mm to 12.0 mm with its second dimension fixed at 1.2 mm or 2.4 mm respectively. This lens is used for applications from surface treatment to welding and cutting.