Abstract

A high-energy laser attenuator in the range of 250mJ (20ns pulse width, 10Hz repetition rate, 1064nm wavelength) is described. The optical elements that constitute the attenuator are mirrors with relatively low reflectance, oriented at a 45° angle of incidence. By combining three pairs of mirrors, the incoming radiation is collinear and has the same polarization orientation as the exit. We present damage testing and polarization-dependent reflectance measurements for 1064nm laser light at 45° angle of incidence for molybdenum, silicon carbide, and copper mirrors. A six element, 74 times (18dB) attenuator is presented as an example.

© 2008 Optical Society of America

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