Determination of the second-order susceptibility of ammonium dihydrogen phosphate and alpha-quartz at 633 and 1064 nm

The second-order susceptibility d(36) Of ammonium dihydrogen phosphate (ADP) was determined from phase-matched second-harmonic generation (SHG) at two wavelengths. A cw single-mode He-Ne laser (lambda = 633 nm) and a cw single-mode Nd:YAG laser (lambda = 1064 nm) were used as fundamental beam sources. The results were d(36)(ADP, 633 nm) = (1.31 +/- 0.05) x 10(-9) esu = 0.55 +/- 0.02 pm/V and d(36)(ADP, 1064 nm) = (1.10 +/- 0.06) x 10(-9) esu = 0.46 +/- 0.03 pm/V. The d(11) values of alpha-quartz were determined relative to d(36)(ADP) to be d(11)(alpha-quartz, 633 nm) = (7.4 +/- 0.3) x 10(-10) esu = 0.31 +/- 0.01 pm/V and d(11)(alpha-quartz, 1064 nm) = (7.1 +/- 0.3) x 10(-10) esu = 0.30 +/- 0.01 pm/V by the use of the Maker fringe method. The Miller's delta of ADP and alpha-quartz is in good agreement at the two wavelengths. (C) 1995 Optical Society of America