Electro-optic crystals have a wide variety of applications in modern optoelectronics and lasers technology, such as  modulators, Q-switches, pulse-pickers, electro-optic deflectors so on. In comparison with other DKDP, LiNbO₃ and BBO crystals, Rubidium titanyl phosphate (RbTiOPO₄, RTP) is considered as a promising material, mainly due to large effective electro-optic coefficients, high optical damage threshold, very low Piezoelectric Ringing, which makes it especially suitable for the high repetition rate lasers. 

 In this paper, high resistivity 10¹¹-10¹² W×cm RTP crystals with dimension up to 40´40´30mm were obtained using an optimized high [Rb]/[P] molar ration flux composition and concentration by improved TSSG method. In our opinion, the detrimental electrochromism, optical homogeneity and monodomain determine the performance for RTP electro-optic application. The detrimental electrochromism was not observed under a continuous 2500V/mm Z-directed electric field over more than 1000 hours. The experimental homogeneity and d33 coefficient measurement indicated that optical property and monodomain have the excellent results.

 Fig 1. The 10000V/4mm electrochromic damage experiment for RTP crystal

The RTP Q-switch was built utilizing thermally compensated double-crystal designs. A series of electro-optic experiments, including half-wave voltage, contrast ratio, insertion loss, thermal stability, high repetition rate and so on, were extensively investigated. The results have proved that RTP crystals can be the good choice for the majority of Q-switching applications.

References

[1] E. Lebiush, R. Lavi, Y. Tsuk, N. Angert, A. Gachechiladze, M. Tseitlin, A. Zharov and M. Roth, Proc. of ASSL (Advanced Solid State Lasers), TOPS Vol. 34 (2000) 63.

[2] Tseitlin, E. Mojaev and M. Roth. Growth of high resistivity RbTiOPO4crystals.J. Cryst. Growth 310 (2008) 1929.

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