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Wow! That doesn't sound good for a diode laser at all. I have lost 1W 808nm
laser diodes that way, i would sure hate to lose a spyder cause of back reflection.
Bad design flaw if you ask me
The only other option besides reflecting the light would be absorbing most of it. This would require (I assume) much more expensive material since it would need to withstand a large amount of the lasers power without burning.