High-average-power single-longitudinal-mode pulse laser based on a pulse saturation seed-injection locking OPO

Area of Science:

• Optics and Photonics
• Laser Physics

Background:

• High-average-power, narrow-linewidth nanosecond (ns) pulse 824 nm lasers are critical for generating deep-ultraviolet (DUV) 248 nm lasers.
• The sum-frequency process requires precise laser parameters for efficient DUV generation.

Purpose of the Study:

• To present a novel seed-injection-locked, high-average-power, single-longitudinal-mode (SLM) ns pulse 824 nm laser.
• To demonstrate a new pulse-saturated seed-injection locking method for improved laser performance.

Main Methods:

• Development of a pulse-saturated seed-injection locking technique.
• Implementation of an optical parametric oscillator (OPO) cavity for laser generation.
• Characterization of output power, pulse width, and linewidth.

Main Results:

• Achieved an output power of 21.2 W at 824 nm with a 15 ns pulse width.
• Demonstrated a narrow linewidth of 38.8 MHz for the 824 nm laser.
• Exceeded a signal-to-noise ratio of 28 dB for the modulated sideband signal.

Conclusions:

• The novel pulse saturation seed-injection locking method effectively eliminates disturbance, enabling high-power and narrow-linewidth laser output.
• The developed 824 nm laser shows significant potential for DUV laser generation applications.
• This work advances the capabilities of OPO cavities for demanding laser applications.