The THz time domain spectra of SrB[sub]4[/sub]O[sub]7[/sub] crystal

Yali Wang; Bihui Hou; Haiyan Wang; Guozhong Zhao; Yishi Shi

doi:10.1117/12.870193

4 November 2010 The THz time domain spectra of SrB₄O₇ crystal

Yali Wang, Bihui Hou, Haiyan Wang, Guozhong Zhao, Yishi Shi

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 785417 (2010) https://doi.org/10.1117/12.870193
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

SrB₄O₇ (SBO) is a promising nonlinear optical crystal. It has the orthorhombic structure with group classified as Pnm2. The sample for the experiment was cut along the (001) plane and twin polishing with 1.632mm thickness. It exhibits a wider transparency range from UV to far-IR. And its absorption edge lies at 160nm. The forbidden band gap is about 7.76eV. The THz spectra of SBO crystal had been studied from 0.1 to 2.5THz. The THz time domain spectrum of SBO shows the strong resonance characters. In THz experiment, the vertical incident electromagnetic waves radiate the polished side twice along (001) orientation. The crystal turned 90 degrees relative to the first in the vertical direction. There are different optical properties in two directions. We gained the curves of the refractive index and absorption coefficient dependence of frequency in the region of 0.1-2.5THz. The absorption curves shows opposite parabola character. One is upward opening and the largest absorption coefficient is 10cm^-1. The other is down opening and the less absorption coefficient is 1cm^-1. The refractive index n is stable linear with frequency and it is 3 from 0.4THz to 2.5THz. But the refractive index of two directions shows the opposite tendency from 0.1 to 0.4THz. The reason of the difference is that polarized beam radiates the orthorhombic crystal. The properties of the sample show that it is possible to apply it to laser field.

Citation Download Citation

Yali Wang, Bihui Hou, Haiyan Wang, Guozhong Zhao, and Yishi Shi "The THz time domain spectra of SrB₄O₇ crystal", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785417 (4 November 2010); https://doi.org/10.1117/12.870193

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KEYWORDS

Terahertz radiation

Crystals

Absorption

Nonlinear crystals

Refractive index

Crystallography

Optical properties

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