Thermal lens spectroscopy in two-component liquid

Thermal Lens Spectroscopy

Effect of molecular structural isomers in thermal lens spectroscopy

Article history: Received 7 March 2014 In final form 31 March 2014 Available online 5 April 2014 We explore the importance of molecular structure on thermal lens (TL) spectroscopy by measuring the effects of molecular isomerization on TL measurements. In particular, we present a case study for all the structural isomers of butanol, namely, normal-butanol (n-BuOH), secondary-butanol (s-BuOH), is...

Contributions of transient absorption and population lens in thermal lens spectroscopy

Contaminations of the population lens and transient absorption in thc obsened thermal lens signal sometimes cause a misinterpretation of the signal. Rcccntly, we ha1.c developed several methods to evaluate the relative contributions of these components in thc observed thermal lens signal. These methods with reccnt results are sumtnarizcd, and mcrits and limitations of each method are discussed.

Diffraction effects in single- and two-laser photothermal lens spectroscopy.

A simple method for calculating the effects of optical geometry on photothermal lens signals is shown. This method is based on calculating cumulative electric-field phase shifts produced by a series of Gaussian refractive-index perturbations produced by the photothermal effect. Theoretical results are found for both pulsed-laser and continuous Gaussian laser excitation sources and both single- ...

Confocal thermal-lens microscope.

The use of a confocal detection scheme in a dual-beam thermal-lens microscope is presented. The scheme allows the measurement of absorption factors down to 1.2 x 10(-7) in a 0.35-microm3 volume by use of a heating laser power of 100 mW incident upon the sample. Results are presented that prove that a 450-nm axial resolution is possible when a 1.2 water immersion objective lens with a N.A. of 1....