Abstract
A properly engineered new ortho-borate with composition of LiCaTb5(BO3)6 (LCTB), shows 55% enhancement of Verdet constant over the widely used magneto-optical TGG crystal. Centimetre level LCTB crystal can be grown from the self-flux LiCaBO3. Transmittance and magnetic measurements reveal that LCTB crystal is highly transparent between 500 and 1500 nm and is paramagnetic down to 2 K with a magnetic easy axis along the [001] direction. Faraday rotation measurements show that the Verdet constant along [001] direction of LCTB crystal is 227 (3) rad/Tm at 633 nm, in comparison to that of TGG crystal (146(2) rad/Tm) under the same measurement conditions. The above results indicate that the title compound can be a promising candidate as a new MO material with high performance in a Faraday isolator.
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