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Related Experiment Video

Updated: Jun 16, 2026

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Laser wavelength selection and output coupling by a grating.

T M Hard

    Applied Optics
    |January 23, 2010
    PubMed
    Summary
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    Applied optics·2010

    Gratings can serve as wavelength-selective end reflectors for lasers. Combining gratings with mirrors creates a stable output beam for tunable lasers like CO2 and dye lasers.

    Area of Science:

    • Optics
    • Laser Physics
    • Photonics

    Background:

    • Gratings are optical components used for wavelength selection.
    • Laser cavities require end reflectors to sustain oscillation.
    • Tunable lasers need wavelength-selective elements for operation.

    Purpose of the Study:

    • To review the principles of using gratings as laser wavelength-selective end reflectors.
    • To present a method for creating a stationary output beam from a tunable laser system.

    Main Methods:

    • Utilizing the zeroth-order reflection of a grating.
    • Employing auxiliary mirrors to stabilize the output beam.
    • Integrating the grating-mirror system into CO2 and dye laser setups.

    Main Results:

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    • A useful output beam can be obtained from a grating's zeroth-order reflection.
    • The grating-mirror combination allows for wavelength selection.
    • The system successfully demonstrated wavelength selectivity in both CO2 and visible dye lasers.

    Conclusions:

    • Gratings are effective as wavelength-selective end reflectors in lasers.
    • The addition of auxiliary mirrors provides a stable output beam for tunable lasers.
    • This grating-mirror technique is applicable to various laser types, including CO2 and dye lasers.