Efficient 640  nm actively Q-switched Pr:YLF laser

Area of Science:

• Laser Physics
• Solid-State Lasers
• Quantum Electronics

Background:

• Praseodymium-doped lasers, particularly Pr:YLF, are crucial for visible light generation.
• Efficient Q-switching is essential for high-energy pulsed laser operation.
• Compact laser designs are desirable for practical applications.

Purpose of the Study:

• To achieve efficient electro-optical (EO) Q-switching in a visible Pr:YLF laser.
• To optimize laser cavity design for reduced optical losses.
• To demonstrate high slope efficiency in a compact Pr:YLF laser system.

Main Methods:

• Utilized a compact plane-parallel cavity design for the Pr:YLF laser.
• Incorporated an intracavity lens for mode control within the gain medium.
• Employed electro-optical (EO) Q-switching modulation.
• Investigated laser performance at different repetition rates (5 kHz and 20 kHz).

Main Results:

• Achieved a single-pulse energy of 28.9 µJ with a 47.5 ns pulse duration at 5 kHz.
• Obtained an average power of 380 mW at 20 kHz.
• Demonstrated a slope efficiency of 21.2%, the highest reported for an EO Q-switched visible Pr:YLF laser.

Conclusions:

• The compact EO Q-switched Pr:YLF laser design is highly efficient.
• The implemented intracavity lens effectively manages the laser mode, reducing losses.
• This work sets a new benchmark for slope efficiency in visible Pr:YLF lasers, paving the way for advanced optical sources.