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Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Related Experiment Video

Updated: Jun 19, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Photoconductively controlled electro-optic laser modulation.

O S Zucker, I A McIntyre, P J Solone

    Optics Letters
    |October 14, 2009
    PubMed
    Summary
    This summary is machine-generated.

    New electro-optic modulators using photoconductive switches offer flexible control for high-speed laser modulation. These devices enable precise Q switching, mode locking, and cavity dumping for various laser applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Materials Science

    Background:

    • Electro-optic modulators are crucial for controlling laser properties.
    • Existing modulation techniques face limitations in speed and flexibility.
    • Photoconductive switches offer high-speed switching capabilities.

    Purpose of the Study:

    • To introduce novel electro-optic modulator configurations utilizing photoconductive switches.
    • To demonstrate flexible intracavity and extracavity modulation of laser beams.
    • To achieve multigigahertz modulation rates for low- and high-power lasers.

    Main Methods:

    • Development of new electro-optic modulator designs incorporating photoconductive switches.
    • Integration of optical feedback mechanisms for enhanced control.
    • Experimental testing of the modulator for Q switching, mode locking, and cavity dumping a Nd:YAG laser.

    Main Results:

    • Successful Q switching and cavity dumping of a Nd:YAG laser using a single external trigger.
    • Demonstration of simultaneous Q switching, mode locking, and cavity dumping.
    • Generation of laser pulses with durations ranging from sub-80 picoseconds to over 20 nanoseconds.

    Conclusions:

    • The proposed electro-optic modulators provide versatile and high-speed control over laser output.
    • Photoconductive switching and optical feedback enable flexible modulation for diverse laser applications.
    • These modulators significantly expand the capabilities for generating ultrashort and tunable laser pulses.