Harrington J A, Bobbs B L, Braunstein M, Kim R K, Stearns R, Braunstein R
Appl Opt. 1978 May 15;17(10):1541-6. doi: 10.1364/AO.17.001541.
The requirements for low-loss optical materials for use on excimer lasers have stimulated the investigation of optical absorption in a variety of highly transparent materials at visible and uv wavelengths. To provide information over a wide spectral range at low absorption levels ( approximately 10(-5) cm(-1)), laser calorimetric and wavelength modulation spectroscopic techniques were used. Blending these two methods provided, for the first time, spectral information well below the usual levels of absorption measured in studies of the Urbach tail.
准分子激光器对低损耗光学材料的需求激发了对各种高透明材料在可见光和紫外波长下光吸收的研究。为了在低吸收水平（约10^(-5) cm^(-1)）下提供宽光谱范围的信息，采用了激光量热法和波长调制光谱技术。将这两种方法结合起来，首次提供了远低于乌巴赫尾研究中通常测量的吸收水平的光谱信息。
