Abstract

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 (λ = 633 nm) and a cw single-mode Nd:YAG laser (λ = 1064 nm) were used as fundamental beam sources. The results were d ₃₆(ADP, 633 nm) = (1.31 ± 0.05) × 10⁻⁹ esu = 0.55 ± 0.02 pm/V and d ₃₆(ADP, 1064 nm) = (1.10 ± 0.06) × 10⁻⁹ esu = 0.46 ± 0.03 pm/V. The d ₁₁ values of α-quartz were determined relative to d ₃₆(ADP) to be d ₁₁(α-quartz, 633 nm) = (7.4 ± 0.3) × 10⁻¹⁰ esu = 0.31 ± 0.01 pm/V and d ₁₁(α-quartz, 1064 nm) = (7.1 ± 0.3) × 10⁻¹⁰ esu = 0.30 ± 0.01 pm/V by the use of the Maker fringe method. The Miller’s delta of ADP and α-quartz is in good agreement at the two wavelengths.

© 1995 Optical Society of America

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