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Updated: Apr 17, 2026
06:48
A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
800
GdVO4 Raman laser of Lorentzian linewidth less than 3 Hz
Optics Letters
|April 15, 2026
Summary
This study presents a novel Gadolinium Vanadate (GdVO4) Raman laser, achieving an ultra-narrow linewidth below 3 Hz. This breakthrough demonstrates non-diamond materials can produce stable, low-noise optical frequencies.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Raman lasers are key for low phase noise optical frequencies.
- Diamond has been the primary material for stable single longitudinal mode operation.
- Exploring alternative Raman gain media is crucial for wavelength diversity.
Purpose of the Study:
- To report a single longitudinal mode Gadolinium Vanadate (GdVO4) Raman laser.
- To demonstrate narrow linewidth operation using a non-diamond Raman material.
- To achieve output wavelengths at 1164 nm and 1174 nm.
Main Methods:
- Utilized a doubly resonant cavity design.
- Employed Pound-Drever-Hall locking for pump frequency stabilization.
- Performed frequency noise measurements at high Fourier frequencies.
Main Results:
- Achieved a single longitudinal mode GdVO4 Raman laser.
- Output wavelengths were recorded at 1164 nm and 1174 nm.
- Measured a Lorentzian linewidth below 3 Hz, limited by technical noise.
Conclusions:
- This work represents the narrowest linewidth reported for any Raman laser.
- Non-diamond Raman materials, like GdVO4, can support narrow linewidth operation.
- Demonstrates potential for greater diversity in Raman laser output wavelengths.
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