Low Voltage CO(2) Laser Excitation.

Area of Science:

• Plasma physics
• Laser engineering
• Electrical engineering

Background:

• Continuous-wave (cw) carbon dioxide (CO2) lasers are widely used in industrial and scientific applications.
• Traditional excitation methods for CO2 lasers often require high voltages, posing safety and design challenges.
• Optimizing excitation efficiency and reducing operational complexity are key goals in laser development.

Purpose of the Study:

• To investigate the feasibility of low voltage excitation for cw CO2 lasers.
• To explore novel electrode configurations for efficient plasma generation at reduced voltages.
• To assess the impact of low voltage excitation on laser performance and system requirements.

Main Methods:

• Experimental investigation of low voltage plasma excitation.
• Design and testing of various electrode configurations, including grid structures and inverted brush cathodes.
• Analysis of plasma characteristics and voltage-current (V-I) relationships.
• Operation of a reduced height transverse geometry laser system.

Main Results:

• Demonstrated practical low voltage excitation for cw CO2 lasers.
• Identified effective electrode designs, specifically a grid structure with an inverted brush cathode.
• Observed positive resistance V-I characteristics in the plasma.
• Achieved an order of magnitude reduction in required external ballast resistance.

Conclusions:

• Low voltage excitation of cw CO2 lasers is a viable and practical alternative to high voltage methods.
• The developed electrode configurations and transverse geometry enable efficient laser operation at reduced voltages.
• The positive resistance characteristics simplify ballast requirements, leading to more compact and potentially cost-effective laser systems.