Comparative study on three highly sensitive absorption measurement techniques characterizing lithium niobate over its entire transparent spectral range.
Comparative study on three highly sensitive absorption measurement techniques characterizing lithium niobate over its entire transparent spectral range.
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DOI：
10.1364/oe.23.021690
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发表时间：
2015-08
期刊：
影响因子：
3.8
通讯作者：
M. Leidinger;S. Fieberg;N. Waasem;F. Kühnemann;K. Buse;I. Breunig
中科院分区：
文献类型：
--
作者：
M. Leidinger;S. Fieberg;N. Waasem;F. Kühnemann;K. Buse;I. Breunig
我们使用了三个高灵敏度的光谱仪：光声光谱仪、光热共光路干涉仪和基于回音壁共振器的吸收光谱仪，比较研究了在390-3800 nm的波长范围内测量名义上透明的未掺杂、同质生长的LiNbO_3对正常偏振光和异常偏振光的吸收系数。吸收系数从10(-4)cm(-1)到2 cm(-1)不等。此外，我们还用标准的光栅谱仪和傅里叶变换红外光谱仪测量了材料在乌尔巴赫尾部和多声子边缘的吸收光谱，首次提供了Nb酸锂整个透明窗口的吸收光谱。三种高灵敏度和独立的方法得到的吸收系数具有很好的一致性。
We employ three highly sensitive spectrometers: a photoacoustic spectrometer, a photothermal common-path interferometer and a whispering-gallery-resonator-based absorption spectrometer, for a comparative study of measuring the absorption coefficient of nominally transparent undoped, congruently grown lithium niobate for ordinarily and extraordinarily polarized light in the wavelength range from 390 to 3800 nm. The absorption coefficient ranges from below 10(-4) cm(-1) up to 2 cm(-1). Furthermore, we measure the absorption at the Urbach tail as well as the multiphonon edge of the material by a standard grating spectrometer and a Fourier-transform infrared spectrometer, providing for the first time an absorption spectrum of the whole transparency window of lithium niobate. The absorption coefficients obtained by the three highly sensitive and independent methods show good agreement.