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Observation of a different birefringence order at optical and THz frequencies in LBO crystal

Andreev, Y, Kokh, AE, Kokh, KA, Lanskii, GV, Litvinenko, Konstantin, Mamrashev, AA, Molloy, JF, Murdin, Benedict, Naftaly, M, Nikolaev, NA and Svetlichnyi, VA (2017) Observation of a different birefringence order at optical and THz frequencies in LBO crystal Optical Materials, 66. pp. 94-97.

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Abstract

THz optical properties of lithium borate (LBO) crystals were measured using time-domain spectroscopy (TDS). The LBO crystal samples were of high optical quality and were cut and polished along the h100i, h010i and h001i axes. Two independent measurements were performed in order to con rm the reproducibility and consistency of results. The contradictions in the previously published data on the THz optical properties of LBO were clari ed. It was shown that the birefringence order at THz frequencies is nz < nx < ny, whereas at optical frequencies it is known to be nx < ny < nz. It was seen that nz, which has the highest value in the visible, has the lowest value at THz. This is explained in terms of ionic polarizability and is consistent with the fact that the THz absorption coe cient for a wave polarized along the Z-axis is more than an order of magnitude lower than for the X and Y axes. Absorption as low as 0.2 cm 1 was found at frequencies up to 0.5 THz for a wave polarized parallel to the Z-axis. A set of new dispersion equations was designed for the entire transparency range.

Item Type: Article
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute
Authors :
NameEmailORCID
Andreev, YUNSPECIFIEDUNSPECIFIED
Kokh, AEUNSPECIFIEDUNSPECIFIED
Kokh, KAUNSPECIFIEDUNSPECIFIED
Lanskii, GVUNSPECIFIEDUNSPECIFIED
Litvinenko, KonstantinK.Litvinenko@surrey.ac.ukUNSPECIFIED
Mamrashev, AAUNSPECIFIEDUNSPECIFIED
Molloy, JFUNSPECIFIEDUNSPECIFIED
Murdin, BenedictB.Murdin@surrey.ac.ukUNSPECIFIED
Naftaly, MUNSPECIFIEDUNSPECIFIED
Nikolaev, NAUNSPECIFIEDUNSPECIFIED
Svetlichnyi, VAUNSPECIFIEDUNSPECIFIED
Date : 31 January 2017
Identification Number : 10.1016/j.optmat.2017.01.031
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : lithium triborate, optical properties, terahertz generation
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 03 Feb 2017 18:45
Last Modified : 27 Jul 2017 09:37
URI: http://epubs.surrey.ac.uk/id/eprint/813456

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