High-power phosphate-glass laser system: design and performance characteristics

Area of Science:

• High-energy laser physics
• Laser system engineering
• Nonlinear optics

Background:

• Development of high-power laser systems is crucial for various scientific fields, including inertial confinement fusion and advanced materials processing.
• Previous laser systems faced limitations in power, energy delivery, and beam quality.

Purpose of the Study:

• To design, build, and test a one-beam prototype of a large twenty-four-beam phosphate-glass laser system.
• To evaluate the performance characteristics of the prototype, including power, energy, brightness, and contrast.

Main Methods:

• Utilized Nd-doped phosphate glass as the active medium.
• Incorporated rod amplifiers up to 90-mm diameter.
• Employed circularly polarized beam propagation, extensive spatial filtering and imaging, and large-aperture Pockels cells.

Main Results:

• Demonstrated focusable power exceeding 750 GW/beam at 50-psec pulse duration.
• Delivered 165 J of focusable energy in a 500-psec pulse.
• Achieved maximum beam brightness of 4 x 10(19) W/cm(2) .sr and peak-to-background energy contrast of 10(8).

Conclusions:

• The one-beam prototype validates the design principles for a large-scale, high-power laser system.
• The demonstrated performance metrics indicate the system's suitability for demanding scientific applications.
• Further development of the twenty-four-beam system is warranted based on the successful prototype testing.