Ill present this thought: If KTP (Potassium Titanyl Phosphate) is basically a crystal of the stuff similar to what farmers toss on their fields at $50 a ton, why is it so expensive for us?
(From: Sam.) Probably for about the same reason the monetary value of the average adult human body is about $10 in basic elements. It’s all in how they go together! (This cost has been adjusted for inflation as of 2001.) 🙂 (From: Steve.) Use some other (easier) non-linear crystal. For less than 1 W I’d go with ammonium phosphate dihydrate. Just buy “Miracle Grow” plant food, since that’s it’s main ingredient. Then just suspend a seed crystal in the solution and wait. Grow the crystal to about an inch cubed so you can cleave it up into nice clean surfaced chunks for use. Years ago, I used (technical grade) ammonium phosphate (dihydrate) crystals to effectively double a ruby laser into the nicest shade of violet you’ll ever see. 🙂 The fundamental source was a xenon flashlamp excited ruby laser with peak emission at 694.3 nm (red) and the an average power of approximately 200 mW at a pulse repetition rate of around 40 Hz. The second harmonic leaving the crystal was 347.2 nm (violet) at
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