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- Nov 2, 2012
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I've been thinking about AR coatings lately and here is what I am curious about:
Is the 405nm coating designed for peak transmission at 405nm, or is it a "broad spectrum" type AR coating, e.g. 400nm to 600nm as I have seen on the G2-type lenses on Thorlabs' site. (At least, they are essentially the same as the G2 in terms of diameter, focal length, NA, etc.) I've seen it posted that the G2-405 lens has good transmission up to yellow/orange wavelengths, which would agree with a 400nm to 600nm transmission band. This particular AR coating on Thorlabs' site has a peak transmission at about 525nm.
It makes me wonder if the Thorlabs G2-type lenses would be superior for 520nm builds, given that 525nm transmission maximum. If the G2-405 is coated for peak transmission at 405nm, isn't 520nm a bit far away from that? How well does the 405nm AR coating transmit 520nm green?
Green AR lenses might be good for 532nm builds as well, although perhaps not a G2-type lens, given the narrower DPSS beam profile.
With the new 1W 520nm multimode diodes, does anyone know of, or plan to offer, optics that are AR coated specifically for greens, in the same manner as the G2-635 is for red wavelengths?
Is the 405nm coating designed for peak transmission at 405nm, or is it a "broad spectrum" type AR coating, e.g. 400nm to 600nm as I have seen on the G2-type lenses on Thorlabs' site. (At least, they are essentially the same as the G2 in terms of diameter, focal length, NA, etc.) I've seen it posted that the G2-405 lens has good transmission up to yellow/orange wavelengths, which would agree with a 400nm to 600nm transmission band. This particular AR coating on Thorlabs' site has a peak transmission at about 525nm.
It makes me wonder if the Thorlabs G2-type lenses would be superior for 520nm builds, given that 525nm transmission maximum. If the G2-405 is coated for peak transmission at 405nm, isn't 520nm a bit far away from that? How well does the 405nm AR coating transmit 520nm green?
Green AR lenses might be good for 532nm builds as well, although perhaps not a G2-type lens, given the narrower DPSS beam profile.
With the new 1W 520nm multimode diodes, does anyone know of, or plan to offer, optics that are AR coated specifically for greens, in the same manner as the G2-635 is for red wavelengths?