Single-Frequency Raman Laser
The integrated single-mode laser converter is an efficient, simple device that relies on the principle of Raman laser conversion for generating a single longitudinal mode (SLM) or a single-frequency laser output. A SLM laser operates on a single resonator mode so that it emits quasi-monochromatic light with a very narrow line width and very low phase noise. Single longitudinal mode diode lasers have a much narrower bandwidth, making them useful for applications that require precise knowledge of the wavelength.
Because of this, SLM technology is efficient at generating a single longitudinal mode laser with a very small linewidth and low phase noise. Further, the frequency-shifted laser output, with respect to the laser pump input by 30 – 50 nm, provides access to new wavelengths. Additionally, the output laser frequency can be easily adjusted via length tuning of a monolithic diamond resonator via angle or temperature. Moreover, the optical configuration is straightforward compared to conventional methods of generating SLM lasers and resilient against mode competition thanks to spectral hole burning free Raman gain technology. Furthermore, SLM technology is robust to external disturbances, thanks to the complete integration of the laser into a diamond host, and having no need for free-space optical components. Finally, the single-mode technology is both in the longitudinal and transversal direction.
This technology can have many uses in quantum applications for singular light sources, spectroscopy, LIDAR, optical metrology, and communication.
The special features of the SLM technology are as follows:
- Low-cost
- Extremely compact spot size and very low divergence
- Non-diffractive over long distances
- Self-constructive after obstacles
- Robust to jitter, vibrations, and variations on the angle of the input beam
