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Related Concept Videos

Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...

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Related Experiment Video

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

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Published on: April 1, 2020

Optical phase-lock loops with photoconductive semiconductor phase detectors.

F Davidson, C C Wang, S Trivedi

    Optics Letters
    |October 22, 2009
    PubMed
    Summary

    Deep-level trap photoconductive semiconductors act as optical phase detectors. This study demonstrates successful phase locking of Nd:YAG lasers using InP:Fe, GaAs:Cr, GaAs, and CdTe:V crystals.

    Area of Science:

    • Optoelectronics
    • Semiconductor Physics
    • Laser Technology

    Background:

    • Photoconductive semiconductors with deep-level traps exhibit unique electronic properties.
    • Transient optical interference patterns create moving space-charge electric fields within these materials.
    • These fields generate photocurrents, enabling potential applications in optical detection.

    Purpose of the Study:

    • To investigate the use of photoconductive semiconductors as optical phase detectors.
    • To demonstrate the feasibility of phase locking lasers using these semiconductor materials.

    Main Methods:

    • Utilizing narrow-linewidth Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) nonplanar ring oscillator lasers.
    • Employing Indium Phosphide doped with Iron (InP:Fe), Gallium Arsenide doped with Chromium (GaAs:Cr), Gallium Arsenide (GaAs), and Cadmium Telluride doped with Vanadium (CdTe:V) crystals as optical phase detectors.

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    Main Results:

    • Successfully achieved phase locking between two Nd:YAG lasers.
    • Validated the functionality of InP:Fe, GaAs:Cr, GaAs, and CdTe:V as effective optical phase detectors in this setup.

    Conclusions:

    • Photoconductive semiconductors with deep-level traps are viable for optical phase detection.
    • The demonstrated phase locking highlights the practical application of these materials in advanced laser systems.