Modeling the population lens effect in thermal lens spectrometry

Abstract

We report a theoretical model and experimental results for laser-induced lensing in solids. The model distinguishes and quantifies the contributions from population and thermal effects. Laser-induced lensing in ytterbium-doped fluorozirconate glass ZBLAN:Yb(3+) is measured, and the thermal and optical properties obtained from analyzing the data with the proposed model agree well with published values. Photothermal techniques are used extensively for the investigation of laser and laser-cooling materials, and the model developed here enables the interpretation of convoluted laser-induced lensing signals that have contributions from different sources.

Исследование скорости релаксации фотовозбужденных молекул индола интерферометрическим методом pump and probe с пикосекундным разрешением

“…[12] было продемонстри-ровано влияние линзы населенности на фотоакустический сигнал в органических растворах. В последнее время этому вопросу уделяется внимание при исследовании лазерных материалов методом тепловой линзы [13,14]. Следует отметить, что в упомянутых работах учет влияния линзы населенности носил коррекционный характер при интерпретации фото-акустических сигналов.…”

Measurement constraints in laser based thermal lens experiments

“…The excited state of the laser-irradiated system relaxes to the ground state through various radiative (fluorescence and phosphorescence) and/or non-radiative mechanisms [4][5][6]. If the system relaxes via non-radiative mechanisms, it transfers the absorbed energy completely to the system in the form of heat.…”

Combined Photothermal Lens and Photothermal Mirror Characterization of Polymers

“…24–29 In addition, recent theoretical developments opened the way for the application of these methods for analytical characterization of transparent to opaque solids, 1,6 considering the effects of population lens in fluorescent materials and photochemical reactions and mass diffusion during laser excitation. 33–36…”