Low-threshold diode-pumped Yb3+,Na+:CaF2 self-Q-switched laser

Area of Science:

• Laser physics
• Materials science
• Solid-state optics

Background:

• Ytterbium (Yb3+) doped materials are crucial for developing efficient solid-state lasers.
• Calcium fluoride (CaF2) is a promising host material due to its favorable optical properties.
• Codoping with alkali ions like sodium (Na+) can further enhance laser performance.

Purpose of the Study:

• To investigate the laser performance of Yb3+, Na+-codoped CaF2 single crystals.
• To demonstrate self-Q-switched laser operation in this novel material.
• To assess the potential of these crystals for compact and efficient laser applications.

Main Methods:

• Fabrication of Yb3+, Na+-codoped CaF2 single crystals.
• Diode-pumped laser experiments at 976 nm.
• Characterization of self-Q-switched laser output parameters (repetition rate, pulse width, efficiency, threshold).

Main Results:

• Demonstrated self-Q-switched laser operation at 1050 nm at room temperature.
• Achieved a repetition rate of 28 kHz and pulse width of 1.5 microseconds at 5 W incident power.
• Obtained a maximal slope efficiency of 20.3% and a minimal threshold absorbed pump power of 30 mW.

Conclusions:

• Yb3+, Na+-codoped CaF2 single crystals exhibit promising laser performance.
• The material is suitable for compact and efficient self-Q-switched solid-state laser applications.
• Further research can explore optimization for specific laser requirements.