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Gradient index collimator lens for high pressure applications.

Bernard Piechal¹, Artem Bercha¹, Filip Dybala¹

¹Institute of High Pressure Physics, PAS, Sokolowska 29/37, 01-142 Warsaw, Poland.

The Review of Scientific Instruments

|July 3, 2014

Summary

This study optimized a gradient index (GRIN) lens for high-pressure liquid cells. The new GRIN lens maintains stable optical power under pressure, enabling consistent laser tuning without setup adjustments.

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Area of Science:

Optics and Photonics
Materials Science
High-Pressure Physics

Background:

Gradient index (GRIN) lenses are susceptible to optical power changes under high pressure due to alterations in their refractive index profile.
Existing optical setups require frequent recalibration when operating under varying pressures, limiting experimental efficiency.

Purpose of the Study:

To develop and optimize a modified GRIN lens for stable performance in liquid-type high-pressure cells.
To compensate for pressure-induced changes in GRIN lens optical power using the refractive index properties of the pressure medium.

Main Methods:

Optimization of a modified gradient index (GRIN) lens design for high-pressure applications.
Integration of the modified GRIN lens into a liquid-type high-pressure cell.
Utilizing a pressure-tuned tapered laser in an external resonator setup to test lens performance.

Main Results:

The modified GRIN lens demonstrated optical power that remained nearly constant up to 1.6 GPa.
The pressure-tuned tapered laser achieved a tuning range that was largely independent of applied pressure.
The optical setup required no modifications to maintain performance across the tested pressure range.

Conclusions:

The developed modified GRIN lens effectively compensates for pressure-induced optical power variations in high-pressure liquid cells.
This innovation enables stable laser tuning in high-pressure environments, simplifying experimental procedures and enhancing reliability.