Vol. 35, issue 10, article # 12
Ezhov D. M., Lubenko D. M., Mamrashev A. A., Andreev Yu. M. Temperature dependences of the refractive indices of a nonlinear LiB3O5 crystal in the THz range. // Optika Atmosfery i Okeana. 2022. V. 35. No. 10. P. 878–880. DOI: 10.15372/AOO20221012 [in Russian].Copy the reference to clipboard
Abstract:
Using nonlinear LBO crystals of 30 × 30 × 10 mm3 in size, the spectral-temperature dependences of refractive indices in the long-wavelength part of the THz range 0.05–0.5 THz are obtained by means of terahertz time-domain spectroscopy under heating from 20 to 200 °C. Intersection of spectral dependences of the refractive index components nx and ny at ~ 84 °C is found. The results can be used for selection of types and phase-matching conditions for frequency conversion into long-wavelength part of the THz range, which is prospective for monitoring the gas composition of the atmosphere due to weak influence of the aerosol attenuation.
Keywords:
nonlinear crystal, lithium triborate, LiB3O5, THz range, temperature dependence, refractive index, difference frequency generation, birefringence
References:
1. Naftaly M., Vieweg N., Deninger A. Industrial applications of Terahertz sensing: State of play // Sensors. 2019. V. 19, N 19. 35 p.
2. Marcus M., Pattan B. Millimeter wave propagation: Spectrum management implications // IEEE Microw. Mag. 2005. V. 6, N 2. P. 54–62.
3. Nikogosyan D.N. Lithium triborate (LBO) // Appl. Phys. A. 1994. V. 58, N 3. P. 181–90.
4. Andreev Yu.M., Kokh A.E., Kokh K.A., Lanskii G.V., Litvinenko K., Mamrashev A.A., Molloy J.F., Murdin B., Naftaly M., Nikolaev N.A., Svetlichnyi V.A. Observation of a different birefringence order at optical and THz frequencies in LBO crystal // Opt. Mater. 2017. V. 66. P. 94–7.
5. Waasem N., Fieberg S., Hauser J., Gomes G., Haertle D., Kühnemann F., Buse K. Photoacoustic absorption spectrometer for highly transparent dielectrics with parts-per-million sensitivity // Rev. Sci. Instrum. 2013. V. 84, N 2. 8 p.
6. Tu H., Hu Z., Zhao Y., Yue Y., Hou J., Fan F. Growth of large aperture LBO crystal applied in high power OPCPA schemes // J. Cryst. Growth. 2020. V. 546. P. 125728.
7. Yoshida H., Fujita H., Nakatsuka M., Yoshimura M., Sasaki T., Kamamura T., Yoshida K. Dependences of laser-induced bulk damage threshold and crack patterns in several nonlinear crystals on irradiation direction // Japan. J. Appl. Phys. 2006. V. 45, N 2A. P. 766–69.
8. Andreev Y.M., Naftaly M., Molloy J.F., Kokh A.E., Lanskii G.V., Svetlichnyi V.A., Losev V.F., Kononova N.G., Kokh K.A. LBO: Optical properties and potential for THz application // Laser Phys. Lett. 2015. V. 12, N 11. P. 115402.
9. Kononova N.G., Kokh A.E., Kokh K.A., Lanskii G.V., Losev V.F., Svetlichnyi V.A., Andreev Y.M. Down-Conversion of short-wavelength radiation in LBO crystal // Russ. Phys. J. 2016. V. 59, N 8. P. 1307–1315.
10. Tang Y., Cui Y., Dunn M.H. Thermal dependence of the principal refractive indices of lithium triborate // J. Opt. Soc. Am. B. 1995. V. 12, N 4. P. 638–643.
11. Grechin S.G., Zuev A.V., Kokh A.E., Moiseev N.V., Popov P.A., Sidorov A.A., Fokin A.S. Thermophysical parameters of the LBO crystal // Quan. Electron. 2010. V. 40, N 6. P. 509–512.
12. Mamrashev A.A., Nikolaev N.A., Kuznetsov S.A., Gelfand A.V. Broadband metal-grid polarizers on polymeric films for terahertz applications // AIP Conf. Proc. N 2300. 2020. P. 020083–020085.
13. Mamrashev A., Minakov F., Nikolaev N., Antsygin V. Terahertz time-domain polarimetry for principal optical axes of anisotropic crystals // Photonics. 2021. V. 8, N 6. P. 213.