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Improved Monoblock laser brightness using external reflector.

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    Summary
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    Researchers developed a simple method to reduce Monoblock laser beam divergence. This technique significantly improves beam quality for eye-safe laser range finders.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • Monoblock lasers are preferred for long-range, eye-safe laser range finders due to their 1570 nm emission, high pulse energy, and efficiency.
    • Standard Monoblock lasers exhibit significant beam divergence (10-12 mrad), necessitating reduction for precise applications.

    Purpose of the Study:

    • To present a compact and effective technique for reducing Monoblock laser beam divergence.
    • To enhance the beam quality of Monoblock lasers for improved performance in range-finding applications.

    Main Methods:

    • A simple technique employing a partial reflector placed near an optical parametric oscillator (OPO) was utilized.
    • Experiments were conducted using a 38 mm Monoblock laser and a 10 mm potassium titanyl phosphate (KTP) OPO.

    Main Results:

    • A beam divergence of less than 4 mrad was achieved, representing a >2.5x reduction compared to the unmodified laser.
    • The study investigated the impact of varying feedback and etalon spacings on performance.

    Conclusions:

    • The presented partial reflector technique offers a straightforward and compact solution for reducing Monoblock laser beam divergence.
    • This method enhances the suitability of Monoblock lasers for applications requiring high beam quality and precision.