Optical Properties and Terahertz Radiation Generation in a LI2B4O7 Crystal

• Published in: Russian physics journal Vol. 63; no. 12; pp. 2066 - 2069
• Main Authors: Nikolaev, N. A., Mamrashev, A. A., Andreev, Yu. M., Ezhov, D. M., Lanskii, G. V., Lubenko, D. M., Kinyaevskii, I. O., Solntsev, V. P.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-04-2021; Springer Nature B.V
• Subjects: Absorptivity; Condensed Matter Physics; Hadrons; Heavy Ions; Lasers; Lithium borates; Mathematical and Computational Physics; Neodymium lasers; Nuclear Physics; Optical Devices; Optical properties; Optics; Phase matching; Photonics; Physics; Physics and Astronomy; Refractivity; Semiconductor lasers; Terahertz frequencies; Theoretical; Tunable lasers; Wave generation; YAG lasers; absorption coefficient; B; difference frequency generation; refractive index; millimeter waves; nonlinear crystal; Li; O
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-021-02275-9

Spectral dependences of components of the refractive index and absorption coefficient in a Li
2
B
4
O
7
(LB4) nonlinear crystal are determined in the THz range for the first time. Measurements have been carried out in the 0.15–1.6 THz (180–2000 μm) spectral range. The measured refractive index components are approximated by the Sellmeier dispersion equations subsequently used to determine the possible interaction types and to calculate the phase-matching angles for THz wave generation at the difference frequency between a Nd:YAG laser and a tunable laser source with a close wavelength. The efficiency of the process is estimated.