Modeling the population lens effect in thermal lens spectrometry

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Laser-induced lensing is a phenomenon affecting laser performance and material characterization.
• Understanding the sources of lensing, such as thermal and population effects, is crucial for material development.
• Existing methods may struggle to deconvolute complex lensing signals.

Purpose of the Study:

• To present a theoretical model for laser-induced lensing in solids.
• To experimentally validate the model using ytterbium-doped fluorozirconate glass (ZBLAN:Yb(3+)).
• To enable accurate interpretation of laser-induced lensing signals with multiple contributing factors.

Main Methods:

• Development of a theoretical model distinguishing population and thermal lensing contributions.
• Experimental measurement of laser-induced lensing in ZBLAN:Yb(3+) glass.
• Analysis of experimental data using the developed theoretical model.

Main Results:

• The theoretical model successfully quantifies contributions from population and thermal effects.
• Experimental results for ZBLAN:Yb(3+) align well with the model's predictions.
• Obtained thermal and optical properties match published values for the material.

Conclusions:

• The proposed model provides a robust framework for understanding laser-induced lensing.
• It allows for the accurate determination of material properties from lensing measurements.
• This work enhances the application of photothermal techniques in laser material research.