Best selection of quality first surface laser mirrors and output couplers on eBay! These are from Lexel Laser who also acquired mirrors from Spectra Physics prior to them closing up shop. Priced so you can buy a variety and save lots of $. These are all 15mm diameter x 10 mm thick fused silica polished to 1/20 wave for precise cavity mirrors in argon ion & krypton ion lasers made by Lexel Laser. I have schematic drawings that show the specs for these. i have included images for a few of them. They are all similar with variations of center wavelength, % transmission (leak) and radius of curvature (ROC) in meters. Depending on the CWL, the reflectivity is around >99.9% +/- 28nm of center wavelengths so there is room for what you are looking for even if not at CWL. For the output couplers there is an AR coating on S2 with <0.25% R. For my listings I have made part numbers a little clearer, e.g. 490-4.3%T-2M has a center wavelength of 490nm, leaks 4.3% of the laser light, and has a 2.0 meter radius of curvature. The Lexel part number is less straightforward to a person not familiar with their part number system: "61-490-043-20". The Spectra Physics part number for that same optic is G3808-007. Each is individually packaged and labeled on the edge of the mirror. My goal is to price them to get them back into service for your project or experiment. As always, your complete satisfaction is guaranteed. I have many happy customers, and would like you to become one as well. For more general laboratory optics such as bandpass filters, equilateral dispersion prisms, cylindrical lenses, and RGB (white light) laser mirrors at equally fantastic prices, please visit Sterling Resale Optics. Ships within 24 hours of received payment. Within USA winning bid to pay $6.80 s/h for first item and then the shipping discounts kick in. International bids ok but have patience with the postal system. Good Luck!!