Spectral and thermal properties of quasiphase-matching second-harmonic-generation in Nd3+ :Sr0.6 Ba0.4 (NbO3)2 multiself-frequency-converter nonlinear crystals

• Published in: Journal of applied physics Vol. 93; no. 5; pp. 3111 - 3113
• Main Authors: Romero, J. J., Aragó, C., Gonzalo, J. A., Jaque, D., Garcı́a Solé, J.
• Format: Journal Article
• Language: English
• Published: 01.03.2003
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.1539911

Quasiphase-matching second-harmonic-generation experiments have been performed on the Nd3+-doped strontium barium niobate multiself-frequency-converter nonlinear crystals. Optical microscopy has been used to determine the size dispersion of cylindrical ferroelectric domains appearing in as-grown crystals. A broad distribution of domain sizes (ranging between 1.5 and 8 μm) has been obtained. This gives the possibility of broadband second-harmonic generation in the 800–1200 nm range. The dependence of second-harmonic efficiency on crystal temperature has been found to be correlated with the thermal behavior of the spontaneous polarization, so that second-harmonic efficiency is almost temperature independent in the 25–50 °C range.