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YVO4 cascaded Raman laser for five-visible-wavelength switchable emission
Optics Letters
|May 2, 2020
Summary
This study demonstrates a novel cascaded Raman laser system capable of generating switchable visible light at five distinct wavelengths. This efficient method offers a convenient solution for multi-wavelength laser applications.
Area of Science:
- Optics and Photonics
- Laser Physics
- Nonlinear Optics
Background:
- Visible light generation often requires complex setups.
- Tunable and switchable laser sources are crucial for various applications.
- Cascaded Raman scattering offers a pathway for frequency conversion.
Purpose of the Study:
- To develop a convenient and efficient method for generating switchable visible light.
- To demonstrate wavelength-switchable emission using a cascaded Raman cavity.
- To explore frequency mixing in a nonlinear crystal for visible light generation.
Main Methods:
- Utilized a YVO4 cascaded Raman cavity driven by a Q-switched Nd:YAP laser.
- Employed angle-tuned Beta Barium Borate (BBO) crystal for second-harmonic and sum-frequency generation.
- Investigated frequency mixing of fundamental, first-Stokes, and second-Stokes waves.
Main Results:
- Achieved switchable emission of visible light at five wavelengths (539.9, 567.2, 597.4, 631.0, and 668.5 nm).
- Obtained average output powers ranging from 190 mW to 800 mW at a 10 kHz pulse repetition frequency.
- Demonstrated efficient frequency mixing with a narrow phase-match angle tuning span of approximately 2.3° in the BBO crystal.
Conclusions:
- The developed cascaded Raman laser system provides a convenient and efficient approach for wavelength-switchable visible light generation.
- This system is suitable for multi-wavelength laser applications requiring on-demand spectral output.
- Angle-tuned nonlinear frequency conversion in BBO is effective for generating multiple visible wavelengths from a Raman laser source.
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