Laser optics are commonly optimized for a single wavelength. If frequency-multiplying lasers are used, this must also be considered in the selection of beam-guiding components.
LASER COMPONENTS offers so-called triple mirrors in which three wavelengths are reflected. They are used, for example, in Nd:YAG laser systems that emit at the fundamental wavelength 1064 nm (IR) and have harmonic waves at 532 nm (green) and 355 nm (UV).
A new coating makes it possible to apply this complex layer design in one pass, especially in combination with an ion-assisted deposition (IAD) or ion beam sputter (IBS) coating. These ion-supported technologies allow a very exact and reproducible result that exceeds the precision of previous methods.
Old Method – Time-consuming and Costly
Coatings for three wavelengths used to have to be manufactured in two passes: For YAG laser mirrors, for example, a coating for 1064 nm and 532 nm was first applied to the substrate (double mirror) and then, in an additional run, a mirror coating for 355 nm was vapor deposited on top of the first coating.
The production of these mirrors was, therefore, relatively complex.
A similar method was necessary with mirrors that should reflect 1064 nm and 532 nm, as well as a pilot beam at 635 nm, for example. The additional reflection at 635 nm was coated in a first run, and then a second coating was applied for 1064 nm and 532 nm.
New Method – Fast, High Capacity, Attractive Prices
The new method not only results in higher specifications, but it also has the additional advantage of a shorter duration of production, which results from not having to carry out a second coating. Furthermore, the new applied coating unit contains more substrates than before, allowing larger amounts to be produced. This positively affects the unit price.
The new triple laser mirrors are produced for very different wavelength combinations. Let us know your requirements, and we will provide you with a solution. In the example below, you will see the comparison of the calculated (green) and the measured (red) transmission values of an HR 1064+532+355 (AOI 45°, u-pol, uncoated backside) mirror.
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