Abstract

Thermally induced solution stirring can cause periodic signal fluctuations which can be the sensitivity limiting factor in thermal lens spectroscopy with a chopped pump laser. Pump and probe laser fluctuations are shown to be random, while thermal lens signals are shown to have a small periodic component caused by stirring. The problem is serious in dilute solutions because of the high solvent background absorbance.

Ultrasensitive thermal lens spectroscopy of water

Renato Antonio Cruz, Arístides Marcano, Carlos Jacinto, and Tomaz Catunda
Opt. Lett. 34(12) 1882-1884 (2009)

Modeling the population lens effect in thermal lens spectrometry

J. R. Silva, L. C. Malacarne, M. L. Baesso, S. M. Lima, L. H. C. Andrade, C. Jacinto, M. P. Hehlen, and N. G. C. Astrath
Opt. Lett. 38(4) 422-424 (2013)

Enhancement of the thermal lens signal induced by sample matrix absorption of the probe laser beam

Victor I. Grishko, Chieu D. Tran, and Walter W. Duley
Appl. Opt. 41(27) 5814-5822 (2002)

Thermal-lens-induced anomalous solvent’s effect on fluorescence produced by two-photon continuous-wave laser excitation

Marc Fischer and Chieu D. Tran
Appl. Opt. 39(33) 6257-6262 (2000)

Laser-induced thermal lens effect: a new theoretical model

S. J. Sheldon, L. V. Knight, and J. M. Thorne
Appl. Opt. 21(9) 1663-1669 (1982)