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Multi-pulse laser generation based on programming diffraction loss of acousto-optic Q-switched RF excited waveguide
Applied Optics
|August 12, 2025
Summary
Acousto-optic Q-switched (AOQ-switched) carbon dioxide (CO2) lasers now offer tail-free pulses and improved energy use. Precise control of the acousto-optic modulator (AOM) enables multi-pulse generation and higher average power.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Acousto-optic Q-switched (AOQ-switched) carbon dioxide (CO2) lasers typically exhibit long pulse tails and inefficient energy utilization.
- These limitations hinder optimal laser performance and application potential.
Purpose of the Study:
- To investigate the dynamical properties of AOQ-switched CO2 lasers using programmable diffraction loss control.
- To demonstrate the generation of tail-free single and multiple laser pulses with enhanced energy utilization.
Main Methods:
- Development of a six-temperature model to analyze laser dynamics.
- Precise programming of the acousto-optic modulator (AOM) control signal parameters (delay time, pulse width, pulse interval).
- Experimental validation of tail-free pulse generation and multi-pulse capabilities.
Main Results:
- Achieved tail-free AOQ-switched CO2 laser pulses with 1.36 kW peak power and 132 ns pulse width at 5 kHz repetition rate.
- Successfully generated equal energy double, triple, and quadruple pulses through programmed AOM control.
- Significant improvement in the average output power of the laser system.
Conclusions:
- Programmable diffraction loss control via AOM is an effective method to overcome limitations of traditional AOQ-switched CO2 lasers.
- The developed model and experimental techniques enable precise tailoring of laser pulse characteristics.
- This advancement offers potential for improved performance in various laser applications requiring specific pulse formats and higher energy efficiency.
