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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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483

1.4 µm continuous-wave diamond Raman laser.

Riccardo Casula, Jussi-Pekka Penttinen, Alan J Kemp

    Optics Express
    |December 17, 2017
    PubMed
    Summary

    Researchers developed a diamond Raman laser emitting at ~1.4 µm, achieving 2.3 W output power. This semiconductor disk laser (SDL) system demonstrated narrow spectral emission and broad tunability for advanced laser applications.

    Area of Science:

    • Laser physics
    • Materials science
    • Optoelectronics

    Background:

    • Semiconductor disk lasers (SDLs) offer high power and good beam quality.
    • Diamond Raman lasers provide wavelength conversion capabilities.
    • Efficient generation of long-wavelength light is crucial for various applications.

    Purpose of the Study:

    • To report the longest wavelength emission from a diamond Raman laser pumped by an SDL.
    • To characterize the output power, efficiency, and spectral properties of the system.
    • To demonstrate the tunability of the diamond Raman laser.

    Main Methods:

    • Utilized a semiconductor disk laser (SDL) for pumping an intracavity diamond Raman laser.
    • Employed etalons to achieve narrow Stokes emission (FWHM <0.1 nm).

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  • Incorporated a birefringent filter for tuning the SDL oscillation wavelength and thus the Raman laser output.

    • Main Results:

    • Achieved the longest reported wavelength emission of ~1.4 µm from a diamond Raman laser.
    • Reached a maximum output power of 2.3 W with 3.4% optical conversion efficiency.
    • Demonstrated narrow spectral linewidth and achieved >40 nm tuning range.

    Conclusions:

    • The developed diamond Raman laser system is efficient and tunable at long wavelengths.
    • This technology holds promise for applications requiring specific long-wavelength light sources.
    • The combination of SDL pumping and diamond Raman conversion offers a versatile platform for laser development.