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Proceedings Paper

The THz time domain spectra of SrB[sub]4[/sub]O[sub]7[/sub] crystal
Author(s): Yali Wang; Bihui Hou; Haiyan Wang; Guozhong Zhao; Yishi Shi
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Paper 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.

Paper Details

Date Published: 4 November 2010
PDF: 6 pages
Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785417 (4 November 2010); doi: 10.1117/12.870193
Show Author Affiliations
Yali Wang, Graduate Univ. of the Chinese Academy of Sciences (China)
Bihui Hou, Beijing Univ. of Technology (China)
Haiyan Wang, Capital Normal Univ. (China)
Guozhong Zhao, Capital Normal Univ. (China)
Yishi Shi, Graduate Univ. of the Chinese Academy of Sciences (China)

Published in SPIE Proceedings Vol. 7854:
Infrared, Millimeter Wave, and Terahertz Technologies
Cunlin Zhang; Xi-Cheng Zhang; Peter H. Siegel; Li He; Sheng-Cai Shi, Editor(s)

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