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We report on telecom laser frequency stabilization to narrow iodine hyperfineline in the green range of the optical domain, after a frequency triplingprocess using two nonlinear PPLN crystals. We have generated up to 300 mWoptical power in the green (P3w), from 800 mW of infrared power (Pw). Thisresult corresponds to an optical conversion efficiency eta= P3w/Pw ~ 36 %. Toour knowledge, this is the best value ever demonstrated for a CW frequencytripling process. We have used a narrow linewidth iodine hyperfine line(component a1 of the 127I2 R 35 (44-0) line) to stabilize the IR laser yieldingto frequency stability of 4.8x10-14 t-1/2 with a minimum of 6x10-15 reachedafter 50 s of integration time. The whole optical setup is very compact andmostly optically fibered. This approach opens the way for efficient and elegantarchitecture development for space applications as one of several potentialuses.

Frequency tripled 1542 nm telecom laser diode stabilized to iodine hyperfine line in the 10-15 range