Wavelength-versatile deep-red laser source by intracavity frequency converted Raman laser.

Area of Science:

• Optics and Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Developing tunable and efficient deep-red laser sources is crucial for various applications.
• Intracavity frequency conversion offers a promising route to generate new laser wavelengths.

Purpose of the Study:

• To demonstrate an efficient wavelength-selectable deep-red laser output.
• To utilize intracavity frequency conversion in a Nd:YLF/KGW Raman laser system.

Main Methods:

• An acousto-optic Q-switched Nd:YLF laser at 1314 nm was used to pump a KGW crystal, generating two first-Stokes waves.
• Intracavity sum-frequency generation and second-harmonic generation were performed using an angle-tuned bismuth borate (BIBO) crystal.
• Four discrete deep-red laser emission lines were achieved at 692, 698, 731, and 745 nm.

Main Results:

• The system achieved selectable multi-wavelength output in the deep-red spectral region.
• Maximum average output powers ranged from 2.4 to 3.6 W with pulse durations of 3.2 to 4.3 ns.
• Peak powers reached up to 245 kW, demonstrating high-power laser generation.

Conclusions:

• The Nd:YLF/KGW Raman laser combined with an angle-adjusted BIBO crystal provides a reliable method for generating selectable multi-wavelength deep-red lasers.
• The developed laser system offers short pulse durations and high peak powers.
• This approach is suitable for applications requiring tunable deep-red laser emission.