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Differential Thermal Lens Spectrometry Based on High-Frequency Modulation and Rotoreflective Double-Beam Configuration

Volume 42, Number 1 (Jan. 1988) Page 72-76

Yang, Yen; Hall, Steven C.


A rotoreflected beam thermal lens spectrometer incorporating high-frequency modulation and the conventional double-beam concept is reported. The former enables a steady-state thermal lens to be generated, while the latter provides a means to produce a differential response that corrects for the reference absorbance automatically. The feasibility of this approach is demonstrated, and a method for improvement based on high-frequency polarization modulation is also proposed.