Temperature dependent refractive index, thermo-optic coefficient and birefringence of negative biaxial imidazolium l-tartrate non-linear optical crystal
| Autor: | S. Chinnasami, Rajeev Bhatt, P. Rajesh, Indranil Bhaumik, A.K. Karnal, P. Ramasamy |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Polarized light microscopy
Birefringence Materials science Analytical chemistry 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Crystal 0103 physical sciences Crystal optics Electrical and Electronic Engineering 0210 nano-technology Single crystal Refractive index Principal axis theorem |
| Zdroj: | Optik. 243:167021 |
| ISSN: | 0030-4026 |
| DOI: | 10.1016/j.ijleo.2021.167021 |
| Popis: | 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 °C. The prism coupling technique has been used to determine the refractive index with accuracy ~ 5 × 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° 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/°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 °C. Based on the birefringent measurement it has been confirmed that the IMLT crystal is a negative biaxial crystal. |
| Databáze: | OpenAIRE |
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