1. Ultra-stable microwave generation with a diode-pumped solid-state laser in the 1.5-μm range
- Author
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Vladimir Dolgovskiy, Gianni Di Domenico, Serge Grop, Thomas Südmeyer, Stéphane Schilt, Vincent Giordano, Benoit Dubois, and Nikola Bucalovic
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,General Engineering ,General Physics and Astronomy ,Comb generator ,Physics::Optics ,Laser ,7. Clean energy ,Noise floor ,law.invention ,Frequency divider ,Frequency comb ,Optics ,law ,Diode-pumped solid-state laser ,Phase noise ,Physics::Atomic Physics ,business ,Microwave - Abstract
We demonstrate the first ultra-stable microwave generation based on a 1.5-μm diode-pumped solid-state laser (DPSSL) frequency comb. Our system relies on optical-to-microwave frequency division from a planar-waveguide external cavity laser referenced to an ultra-stable Fabry–Perot cavity. The evaluation of the microwave signal at ~10 GHz uses the transportable ultra-low-instability signal source ULISS®, which employs a cryo-cooled sapphire oscillator. With the DPSSL comb, we measured −125 dBc/Hz phase noise at 1 kHz offset frequency, likely limited by the photo-detection shot-noise or by the noise floor of the reference cryo-cooled sapphire oscillator. For comparison, we also generated low-noise microwave using a commercial Er:fiber comb stabilized in similar conditions and observed >20 dB lower phase noise in the microwave generated from the DPSSL comb. Our results confirm the high potential of the DPSSL technology for low-noise comb applications.
- Published
- 2019