Dipotassium Phosphate crystals have been used to frequency-shift IR to green light for lasers, IIRC. I don't know how well they would work for other frequencies

Dipotassium Phosphate crystals have been used to frequency-shift IR to green light for lasers, IIRC. I don't know how well they would work for other frequencies but doing 1064 to 532nm is workable.