Divergence temporal dynamics of a Q-switched laser

Area of Science:

• Laser physics
• Materials science
• Solid-state optics

Background:

• Q-switched lasers are crucial for various applications.
• Understanding laser dynamics, including pulse shape and beam divergence, is essential for performance optimization.
• Lattice strain effects on active ions in solid-state lasers are not fully characterized.

Purpose of the Study:

• To investigate the direct influence of average lattice strains on the pulse shape of Q-switched lasers.
• To analyze the effect of lattice strains on far-field beam spreading in Q-switched lasers.
• To explore the dynamic behavior of laser divergence during pulse development.

Main Methods:

• Theoretical calculations for the Cr(3+):sapphire laser system.
• Modeling the direct coupling of lattice strains to active ions.
• Simulating laser divergence with and without an internal aperture.

Main Results:

• Lattice strains directly affect the pulse shape of Q-switched lasers.
• The coupling of strains influences far-field beam spreading.
• Dynamic changes in laser divergence were observed during pulse evolution.

Conclusions:

• Direct coupling of lattice strains to active ions is a significant factor in Q-switched laser performance.
• The findings are applicable to Cr(3+):sapphire lasers and can guide research in Ti(3+) and Cr(4+) laser systems.
• Further research into strain effects can lead to improved laser design and control.