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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Evaluation of laser frequency offset locking using an electrical delay line.

Yusuke Hisai, Kohei Ikeda, Haruki Sakagami

    Applied Optics
    |August 18, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Frequency offset locking using an electrical delay line significantly improves laser stability. This technique enhances laser frequency instability by up to 77 times, crucial for quantum optics and precision measurements.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Laser Physics and Technology

    Background:

    • Precise frequency control of lasers is essential for advanced scientific applications.
    • Nd:YAG lasers are widely used but require stabilization for high-precision experiments.

    Purpose of the Study:

    • To demonstrate frequency offset locking between two Nd:YAG lasers using an electrical delay line.
    • To evaluate the frequency instability improvement compared to free-running lasers.
    • To assess the applicability of this technique for compact solid-state lasers and optical frequency combs.

    Main Methods:

    • Implementing a frequency locking scheme with an electrical delay line for Nd:YAG lasers.
    • Measuring relative frequency instability for offset-locked and free-running lasers.
    • Frequency locking a compact solid-state laser to an optical frequency comb.

    Main Results:

    • Achieved a relative frequency instability of 3.5x10-12 for offset-locked Nd:YAG lasers (77x improvement).
    • Demonstrated frequency locking of a compact solid-state laser to an optical frequency comb with an instability of 8.2x10-11 (20x improvement).
    • Compared frequency locking performance against phase locking.

    Conclusions:

    • The electrical delay line offset-locking scheme offers substantial improvements in laser frequency stability.
    • This technique is versatile and applicable to various laser systems, including compact solid-state lasers.
    • The method is valuable for quantum optics, interferometry, and laser cooling experiments like optical lattice clocks.