Singular Light: Integrated Single Mode Laser Converter, is an efficient, simple device that relies on Raman laser conversion for generating a single longitudinal mode (SLM) laser output.

The configuration offered by Singular Light not only offers a more robust generation of SLM lasers compared to conventional techniques, but it also allows ease of adjustment of the output laser frequency. These characteristics make the technology a perfect fit to answer the requirements of many areas of optical metrology and interferometry, from data storage to optical communications. With the advent of diamond quantum computing, Singular Light also presents a unique opportunity for the integration of compact laser sources on a diamond photonic chip.

Working Principle

The operation of an SLM laser is based on a single resonator longitudinal mode, meaning it emits a quasi-chromatic radiation with a rather small linewidth and low phase noise. Conventional techniques for producing an SLM laser are subject to several issues, namely mode competition, requiring complex active control loop systems and a convoluted design of optical arrangements that rely on the use of many elaborated elements within the laser cavities. This results in a SLM laser that is difficult to achieve and maintain, given its high sensitivity to external disturbances.

The working principle of Singular Light relies on the spectral compression of commercial lasers to nearly the theoretical limit. The device is integrated monolithically into a small piece of diamond which only allows one longitudinal mode of the Stokes emission to resonate, therefore generating a SLM laser output that is frequency-shifted with regard to the laser input. Diamond, with its outstanding optical and mechanical properties, allows for the direct generation of ultra-stable single-frequency light at high efficiency.