Research on solid-state lasers with adjustable pulse width based on the controllable release of the inverted...

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Adjustable laser pulse width is critical for precision laser processing and diverse scientific applications.
• Existing methods for pulse width control in solid-state lasers often lack real-time adjustability or simplicity.
• Acousto-optic Q-switching is a common technique for generating pulsed laser output.

Purpose of the Study:

• To propose and validate a theoretical model for actively controlling laser pulse width.
• To investigate the relationship between diffraction loss modulation and inverted population release in a laser resonator.
• To establish optimal control parameters for achieving a wide range of pulse widths without distortion.

Main Methods:

• Development of a theoretical model based on controlling diffraction loss within the laser resonator cavity.
• Modulation of diffraction loss using a set function to control the release of the inverted population.
• Experimental verification of the theoretical model using an acousto-optic Q-switched solid-state laser system.

Main Results:

• A pulse width adjustment range from 27 ns to 62 ns was experimentally achieved.
• Optimal control parameters were determined, distinguishing normal modulation from pulse distortion.
• The proposed method allows for real-time adjustment of the output pulse width.

Conclusions:

• The developed theoretical model and experimental method enable effective real-time adjustment of laser pulse width.
• The acousto-optic Q-switched solid-state laser system offers a simple resonator structure and flexible pulse width control.
• This technique enhances the utility of solid-state lasers in applications requiring variable pulse durations.