PPLN (Periodically poled lithium Niobate) is the frequency doubler of choice for such applications however it needs to operated in a temperature regulated oven. To achieve efficient frequency doubling the input light needs to remain in sync with the frequency doubled output light as they propagate through the frequency doubler. The frequency doubler Crystal optical dispersion and directional dependent propagation ensures that a crystal aligned for 164/532nm operation is unlikely to function effectively for 1680/890nm operation. PPLN however works well over a wide bandwidth.
Bruce > On 11 June 2018 at 19:43 Mark Sims <hol...@hotmail.com> wrote: > > > Well, no. Green laser pointers convert a rather high power 800 nm laser to > 1600 nm in one crystal then divide it to 533 nm in another one. The physics > and manufacturing of them is best described as black magic. They are cheap > because China developed the process to grow the crystals in bulk and crank > out zillions of them for consumer products. > > I suspect that a 1600-ish nm to 800-ish nm converter is not a stock > consumer-quantity device and will cost a pretty penny or two... like a red/IR > laser diode can be had for 50 cents and a telecom VCSEL diode can be $500. > > ------------------ > > > It cannot be too much, given the fact that these are used in > green laser pointers. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
