Temperature dependent refractive index, thermo-optic coefficient and birefringence of negative biaxial imidazolium L-tartrate non-linear optical crystal

被引：6

作者：

Chinnasami, S. ^{[1
]}

Rajesh, P. ^{[1
]}

Bhatt, R. ^{[2
,3
]}

Bhaumik, Indranil ^{[2
,3
]}

Ramasamy, P. ^{[1
]}

Karnal, A. K. ^{[2
,3
]}

机构：

[1] Sri Sivasubramania Nadar Coll Engn, Ctr Crystal Growth, Dept Phys, Kalavakkam 603110, Tamil Nadu, India

[2] Raja Ramanna Ctr Adv Technol, Laser & Funct Mat Div, Crystal Growth & Instrumentat Sect, Indore 452013, India

[3] Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, Maharashtra, India

来源：

OPTIK | 2021年 / 243卷

关键词：

Nonlinear optical; Dielectric axes; Refractive index; Birefringence; Negative biaxial crystal; Thermo optic coefficient; Sellmeier's coefficients; GROWTH; LASER;

D O I：

10.1016/j.ijleo.2021.167021

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Imidazolium L-tartrate (IMLT) single crystal has been grown by slow cooling seed rotation technique. The temperature dependent refractive index (RI) has been measured along the principal axes in the temperature range 30-125 degrees C. The prism coupling technique has been used to determine the refractive index with accuracy - 5 x 10-4. The transmission spectra depict good transparency in the range 340-1350 nm. The principal axes directions have been identified using polarized light microscopy. Principal directions have been found rotated by 44 degrees in the orthogonal xz-plane with respect to the crystallographic x-axis. The generalized temperature dependent equations for the Sellmeier's and thermo-optic (dn/dT) coefficients have been determined. The thermo-optic coefficients (TOC) in the above-specified range have been found to be negative and are -10-5/degrees C. An important set of empirical relations between TOC and wavelength (407-1551 nm) has also been established which is useful for estimating TOC in the temperature range of 30-125 degrees C. Based on the birefringent measurement it has been confirmed that the IMLT crystal is a negative biaxial crystal.

引用

页数：11

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