Nonlinear optical characterizations of monoclinic La_xGd_1−xCa₄O(BO₃)₃ (x = 1, 0.09, 0.13) single crystals

Abstract

The 1064 nm optimal spatial phase matching (PM) direction for LaCa 4 O(BO 3 ) 3 (LaCOB) crystals was found to be (113.5°, 43.8°) with d eff of 1.34 pm V −1 , angular acceptance of 0.9 mrad cm and walk-off angle of 14.9 mrad, and more than a 56% second-harmonic generation (SHG) conversion efficiency was realized on a sample (4 × 4 × 6 mm 3 ) cut in this direction, by using a 1064 nm Nd : YAG pico-second laser. The angular noncritical phase-matching (A-NCPM) wavelengths along the y and z axes for La x Gd 1−x COB (x = 0.09, 0.13) crystals were measured. Using a nanosecond laser, the type-I single-pass A-NCPM SHG conversion efficiency along y axis reached 30.2% by taking advantage of the longer crystal sample (4 × 4 × 27 mm 3 ).

Dielectric and Mechanical Studies of Cyclohexylammonium Hydrogen Maleate Hemihydrate Single Crystals

“…Crystals which display large first and second order hyperpolarizability are the reason for getting high nonlinear response [1][2][3][4]. Organic crystals have an eye of attraction because of their promising high nonlinear optical susceptibilities with less time of optical response and flexibility to fabricate the compounds.…”

Widely Tunable Angular Non-Critical Phase-Matching Wavelengths from 0.72 to 1.42 μm Based on RE1xRE21−xCOB Mixed Crystals

“…Previous researches showed that the family of RECa 4 O(BO 3 ) 3 (RECOB, RE = Y, Gd, La, Tm, Sm, and Nd) crystals were found to be melted congruently and could be grown into a large-size by the Czochralski (Cz) pulling method [14][15][16][17]. More meaningful, the substitutional solid solutions of RE1 x RE2 1−x COB (RE1 = Y, RE2 = Gd, and La) crystals were found to have compositional uniformity along the growth direction [18][19][20]. Furuya et al had found that the ratio of a/b and a/c for Gd x Y 1−x COB crystals were linear variation with the changing of chemical composition x, and their A-NCPM third-harmonic-generation (THG) wavelengths were tunable to be around 1064 nm by keeping the variable x = 0.28, in 1999 [21].…”