Efficient self-seeding of a pulsed Ti3+:Al2O3 laser

Area of Science:

• Laser Physics
• Quantum Optics
• Materials Science

Background:

• Ti:sapphire lasers are crucial for tunable, high-energy pulsed applications.
• Achieving single-longitudinal-mode (SLM) operation across the gain bandwidth is challenging.
• Compact and efficient laser systems are in high demand for scientific research.

Purpose of the Study:

• To design and characterize a compact, widely tunable, narrow-linewidth, megawatt-class pulsed laser system.
• To demonstrate a self-seeding technique for achieving SLM operation in Ti:sapphire lasers.
• To optimize laser performance, including threshold and slope efficiency.

Main Methods:

• Utilizing a Ti(3+):Al(2)O(3) (Ti:sapphire) gain medium.
• Pumping the Ti:sapphire laser with the second harmonic of a Nd:YAG laser.
• Implementing a self-seeding technique by coupling spontaneous fluorescence back into the laser cavity.

Main Results:

• The system delivers 10 mJ pulses with a 5-ns duration and near-transform-limited bandwidth.
• Achieved a threshold of 20 mJ and a slope efficiency exceeding 40%.
• Demonstrated SLM operation across the entire Ti:sapphire gain profile using the self-seeding method.

Conclusions:

• The developed Ti:sapphire laser system is compact, efficient, and widely tunable.
• The self-seeding technique provides a robust method for achieving SLM operation without external seeding.
• This laser system offers a valuable tool for various scientific applications requiring high-energy, narrow-linewidth pulses.