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Silicon Carbide Light Source Exhibits Expansive Wavelength Range

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A research team from Carnegie Mellon University has demonstrated a chip-scale broadband light source in silicon carbide. The tiny optical devices are less than 0.1 mm in size and based on optical comb technology. Such broadband light sources are more typically demonstrated in optical fibers and/or nonlinear crystals. Silicon carbide, which has traditionally been used as an abrasive or for electronic devices that operate at high temperatures or high voltages, has recently emerged as a promising material due to its unique properties. The material possesses strong second- and...Read full article

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    Published: March 2022
    Glossary
    frequency comb
    A frequency comb is a precise and regular series of equally spaced spectral lines, or frequencies, that are generated with great accuracy. The term "frequency comb" is often associated with the Nobel Prize-winning technique known as frequency comb spectroscopy, developed by John L. Hall and Theodor W. Hänsch in the 1990s. The technology has since become a powerful tool in various scientific and technological applications. Key points about frequency combs: Origin and development: The...
    chip
    1. A localized fracture at the end of a cleaved optical fiber or on a glass surface. 2. An integrated circuit.
    kerr effect
    The Kerr effect, named after the physicist John Kerr who first observed it in 1875, is a nonlinear optical phenomenon where the refractive index of a material changes in response to an applied electric field. This effect is particularly pronounced in materials with a high optical Kerr nonlinearity, such as certain dielectrics, semiconductors, and gases. When a strong electric field is applied to a Kerr medium, such as with intense laser light, the refractive index of the material changes in...
    metrology
    Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement, including the development of measurement standards, techniques, and instruments, as well as the application of measurement principles in various fields. The primary objectives of metrology are to ensure accuracy, reliability, and consistency in measurements and to establish traceability to recognized standards. Metrology plays a crucial role in science, industry,...
    Research & Technologyfrequency comboptical frequency combsilicon carbidechipLasersLight SourcesOpticsCarnegie Mellon Universityphotonics researchAmericasKerr effectmetrologyprecision timekeepingtimekeepingmicro-ringTechnology News

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