Method for temporally and spatially resolved thermal-lensing measurements

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Thermal lensing in laser crystals can degrade beam quality and performance.
• Understanding temperature distribution is vital for high-power and high-repetition-rate lasers.

Purpose of the Study:

• To introduce a new method for studying thermal-gradient-induced lensing.
• To analyze the temporal behavior of temperature in laser media.
• To investigate the effects of flashlamp pumping on laser crystal temperature.

Main Methods:

• Development and application of a novel optical method to probe thermal gradients.
• Measurement of temperature distribution in an ErTmHo:YAG laser crystal.
• Characterization of transient temperature behavior during and after flashlamp pumping.

Main Results:

• The study successfully applied the new method to an optically dense laser medium (ErTmHo:YAG).
• Temporal dynamics of flashlamp-pump-induced temperature distribution were determined.
• Data for high-repetition-rate pumping conditions were acquired and analyzed.

Conclusions:

• The reported method provides a valuable tool for characterizing thermal lensing in laser materials.
• The findings offer insights into managing thermal effects in ErTmHo:YAG lasers.
• This research contributes to the advancement of laser crystal characterization techniques.