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Related Concept Videos

Cut-off Frequency of BJT01:17

Cut-off Frequency of BJT

Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Efficient, low-threshold collinear and noncollinear beta-barium borate optical parametric oscillators.

A L Oien, I T McKinnie, P Jain

    Optics Letters
    |June 15, 1997
    PubMed
    Summary

    This study compares collinear and noncollinear barium borate optical parametric oscillators. Noncollinear operation is optimal for higher pump divergence, while collinear operation is best for lower pump divergence, offering improved efficiency and lower thresholds.

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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    Published on: July 12, 2017

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

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    Published on: May 30, 2014

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Barium borate (BBO) crystals are widely used in OPOs due to their nonlinear properties.
    • Understanding the optimal configuration (collinear vs. noncollinear) is key for maximizing OPO performance.

    Purpose of the Study:

    • To analyze and compare the performance of collinear and noncollinear BBO OPOs.
    • To investigate the influence of tangential phase matching and pump walk-off compensation.
    • To determine the optimal configuration based on pump parameters like divergence and spot size.

    Main Methods:

    • Theoretical analysis of collinear and noncollinear OPO configurations.
    • Experimental investigation using third-harmonic Nd:YAG laser pumping.
    • Evaluation of parameters including slope efficiency, threshold, pump divergence, and crystal aperture.

    Main Results:

    • Tangential phase matching and pump Poynting vector walk-off compensation enhance noncollinear operation but are mutually exclusive in Type I BBO OPOs.
    • Tangential phase matching is the dominant effect for Type I BBO OPOs.
    • Noncollinear operation is optimal for pump divergence of 4 mrad, yielding 37% slope efficiency and 5 mJ threshold with near-perfect tangential phase matching.
    • Collinear operation is optimal for pump divergence < 2 mrad, yielding 33% slope efficiency and 3.2 mJ threshold.

    Conclusions:

    • The choice between collinear and noncollinear configurations depends critically on pump beam characteristics.
    • Optimized phase matching is essential for achieving high performance in BBO OPOs.
    • This study provides valuable insights for designing and operating efficient BBO OPOs for various applications.