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What is a Narrow-Linewidth Laser?
A narrow-linewidth laser is a laser source that emits light within a very narrow range of optical frequencies. Its low spectral linewidth indicates a high degree of frequency stability and coherence, making it particularly valuable for applications requiring precise control of the optical frequency.
Narrow-linewidth lasers are commonly used as stable optical references, in precision measurement, coherent communications, interferometry, and quantum technologies.
HOW a Narrow-Linewidth Laser Works
A narrow-linewidth laser achieves a highly stable optical frequency by minimizing sources of frequency fluctuations and phase noise. The laser cavity, gain medium, and frequency stabilization techniques all contribute to the resulting linewidth.
Stable laser generation
The gain medium and optical cavity generate light at a specific optical frequency.
Noise reduction
The laser architecture is designed to reduce sources of frequency and phase fluctuations, such as mechanical, thermal, and electronic noise.
Frequency stabilization
Additional stabilization techniques, such as locking the laser to an optical reference or resonator, can further reduce frequency fluctuations and maintain a narrow linewidth.
