I have an experiment where I need to get a largish (40 mW) amount of 532 nm light and small amount (<50 µW) of 1064 nm light into a device under test. I need something with stable polarization so would like to use polarization maintaining fiber. I know that single mode fibers have some cut off at V<2.405 so there will be some issues with some loss to higher order modes for the shorter wavelength, but I can live with loss at 532 nm.
I'm wondering if I can use a PM fiber designed for 1064 nm (say thorlabs PM980-XP 1) and launch both 1064 nm and 532 nm co-propagating light? I'd like to be able to estimate the mode-field-diameter (for losses at the device interface) and and maybe the V-number of both wavelengths but the fiber manufacture doesn't give all the details about fiber refractive index. I'm also not sure if these panda style fibers have a different calculation for figuring out most of these characteristic numbers.
Will panda style PM fibers be polarization maintaining so far outside their design wavelength?
I know it seems like a very specific question but there are probably a bunch of people in labs wondering the same thing.
