Developing the thermal-lens-insensitive cavity for high-power passively Q-switched Raman yellow lasers

Area of Science:

• Laser Physics
• Optics
• Materials Science

Background:

• Passively Q-switched lasers are crucial for various applications.
• Thermal lensing effects can degrade laser performance and stability.
• Developing high-power yellow lasers requires innovative cavity designs.

Purpose of the Study:

• To design and demonstrate a thermal-lens-insensitive cavity for high-power passively Q-switched yellow lasers.
• To optimize the geometric parameters of the laser cavity for enhanced performance.
• To achieve high pulse energy, narrow pulse width, and high repetition rate operation.

Main Methods:

• Analytical derivation of optimal geometric lengths for the cavity configuration.
• Implementation of a novel cavity design to mitigate thermal lensing effects.
• Experimental characterization of the passively Q-switched yellow laser's performance.

Main Results:

• Achieved a high-power passively Q-switched yellow laser with 0.13 mJ pulse energy.
• Demonstrated a pulse width of 0.76 ns and repetition rate up to 20 kHz.
• Obtained an optical-to-optical conversion efficiency of up to 16.5%.

Conclusions:

• The developed thermal-lens-insensitive cavity enables high-performance passively Q-switched yellow laser operation.
• Optimal cavity configuration ensures excellent passive Q-switching and mode-size matching.
• This work provides a pathway for efficient, high-power yellow laser generation.