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Related Concept Videos

Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...

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Related Experiment Video

Updated: Jun 14, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Frequency stabilized lasers: optical feedback effects.

N Brown

    Applied Optics
    |April 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Frequency stabilization of a 2-mW, 633-nm helium-neon laser is achievable with simple systems. However, even minor optical feedback significantly degrades performance, impacting laser stability.

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    Area of Science:

    • Laser Physics
    • Optical Engineering

    Background:

    • Helium-neon (He-Ne) lasers are widely used for various applications requiring stable light sources.
    • Frequency stabilization is crucial for precision measurements and advanced optical technologies.
    • Internal mirror laser designs offer simplicity but can be sensitive to external perturbations.

    Purpose of the Study:

    • To evaluate the performance of two simple frequency stabilization systems for a 2-mW, 633-nm He-Ne laser.
    • To investigate the impact of optical feedback on the stability of these systems.
    • To compare the sensitivity of the stabilization systems to optical feedback from a plane mirror.

    Main Methods:

    • Implementation of two distinct frequency stabilization techniques for a 2-mW internal mirror 633-nm He-Ne laser.
    • Controlled introduction of optical feedback using a plane mirror at varying levels.
    • Quantitative assessment of laser frequency stability and performance metrics under different feedback conditions.

    Main Results:

    • Both simple frequency stabilization systems demonstrated effectiveness in stabilizing the He-Ne laser frequency.
    • Small amounts of optical feedback were found to significantly degrade the performance of the stabilization systems.
    • The relative sensitivity to optical feedback varied between the two investigated stabilization methods.

    Conclusions:

    • The efficacy of simple frequency stabilization systems for 633-nm He-Ne lasers is confirmed.
    • Optical feedback poses a critical challenge to the performance of these stabilization systems.
    • Careful consideration of optical feedback is essential when designing and implementing laser frequency stabilization setups.