Phase locking of a multimode to a single-mode He-Ne laser

Area of Science:

• Optics and Photonics
• Laser Physics

Background:

• Achieving high coherence between independent lasers is crucial for advanced optical applications.
• Helium-neon (He-Ne) lasers are widely used but often require techniques to enhance their coherence properties.

Purpose of the Study:

• To investigate the phase locking of two independent He-Ne lasers.
• To assess the degree of coherence achieved using feedback control.
• To explore the potential for generating high-power coherent light from laser arrays.

Main Methods:

• Utilized feedback control systems to synchronize the phase of two He-Ne lasers.
• Employed a 0.6328 micrometer wavelength He-Ne laser system.
• Included both single-mode and multimode laser configurations in the experiment.

Main Results:

• Successfully phase locked two independent He-Ne lasers to a very high degree of coherence.
• Demonstrated the effectiveness of the feedback control technique for laser synchronization.
• Observed that the technique is applicable to both single-mode and multimode lasers.

Conclusions:

• The developed feedback control technique effectively achieves high coherence between independent He-Ne lasers.
• This method holds promise for the generation of high-power, coherent light pulses from arrays of He-Ne lasers.
• Suggests a viable pathway for scalable coherent light sources.