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|Title: ||Growth and Characterization of Nonlinear Optical Borate Crystals: CBO, SBO and BBO|
|Authors: ||Pimpalwadkar Anand Darshan|
Optoelectronics and Laser Technology
Nonlinear Optical Borate Crystals
|Issue Date: ||Jun-2015|
|Abstract: ||Laser sources in UV and deep UV regions are scarce. There is high demand of efficient,
compact solid state laser sources in these regions for various applications. Borate materials
are being considered having potential to fulfill this demand. Owing to their
noncentrosymmetric structures, high nlo coefficients, high laser damage thresholds and
transparency till deep UV range make them suitable candidates to generate UV laser through
second and higher harmonic generations.
In this work, borate materials belonging to three different anionic groups were studied and
single crystals were grown for characterization. Cesium triborate and strontium tetraborate
were grown with Czochralski technique and top seeded solution growth was implemented to
grow single crystals of β-barium borate. XRD measurements were carried out on grown
crystals to confirm single phase. Samples were cut from these crystals and transmission spectra
was recorded. Refractive indices in different crystallographic directions were obtained for
different wavelengths. Sellmeier coefficients and birefringence were calculated from this data.
Thermo optic coefficients of refractive index were also determined for these crystals.
Temperature dependence of refractive index for strontium tetraborate was determined for the
first time and unlike most of the borate materials it possessed positive thermo optic coefficient
of refractive index. Conoscopic pattern of β-barium borate confirmed its negative uniaxiality|
|Appears in Collections:||M.Tech Photonics Project Reports|
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