The dual-beam mode-mismatched thermal lens (TL) technique in the near infrared (NIR) and visible spectral regions, as well as mid-infrared (MIR) absorption conventional spectroscopy, were applied to carry out a full spectroscopic characterization of chloroform, dichloromethane, methanol, and ethanol. Absorption spectra due to overtones and combination bands of C−H and O−H bond stretching were acquired in a wide spectral region (870–1040 nm) using a tunable Ti³⁺:sapphire laser, enabling determination of the anharmonicity constants (χ) and dissociation energies. Moreover, the solvents thermal diffusivities were obtained and absorption coefficients ~10⁻⁴ cm⁻¹ or lower were found in some spectral transparence windows in chloroform and dichloromethane. The TL technique proved to be a very sensitive methodology able to determine of overtones with low absorption coefficients.

应用近红外（NIR）和可见光谱区域的双光束模式不匹配热透镜（TL）技术以及中红外（MIR）吸收常规光谱技术，对氯仿进行了全光谱表征，二氯甲烷，甲醇和乙醇。使用可调的Ti ³⁺：蓝宝石激光器在宽光谱区域（870-1040 nm）中获得了由CH和OH键拉伸的泛音和结合带引起的吸收光谱，从而能够确定非谐常数（χ）和离解能 此外，获得了溶剂的热扩散率，吸收系数〜10 ^-4  cm ^-1在某些光谱透明窗口中的氯仿和二氯甲烷中发现或更低。TL技术被证明是一种非常灵敏的方法，能够确定具有低吸收系数的泛音。