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Diamond Raman oscillator operating at 1178 nm
Optics Letters
|May 16, 2020
Summary
High-power Raman frequency downconversion using a fiber amplifier and diamond cavity achieved 136 W output. This technique extends fiber laser capabilities to uncommon wavelengths at high power levels.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Fiber lasers offer versatile light sources but are limited in spectral range.
- Raman frequency conversion is a method to generate new wavelengths.
- Diamond is a promising material for nonlinear optical processes due to its properties.
Purpose of the Study:
- To demonstrate high-power Raman frequency downconversion using an Ytterbium-doped fiber amplifier and a diamond Raman cavity.
- To investigate the performance of the system in quasi-continuous-wave and continuous-wave operation.
- To explore the potential for generating uncommon wavelengths at high power levels.
Main Methods:
- Utilized an Ytterbium-doped fiber amplifier as the pump source.
- Employed a linear external diamond Raman cavity for frequency downconversion.
- Operated the system in quasi-continuous-wave (10% duty cycle, 10 ms on-time) and continuous-wave modes.
Main Results:
- Achieved a maximum output power of 136 W with nearly diffraction-limited beam quality in quasi-continuous-wave mode.
- Reached a record average power of 46 W centered at 1178 nm in continuous-wave operation.
- Investigated the onset of stimulated Brillouin scattering within the diamond cavity.
Conclusions:
- Demonstrated a high-power Raman frequency downconversion system with significant output power.
- The developed technology effectively extends the spectral reach of fiber lasers.
- This approach holds potential for generating high-power laser sources at uncommon wavelengths.
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