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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...

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205-W, 205-mJ cryogenic Ho:YLF picosecond laser.

Hewei Qu, Wei Gao, Yanshen Cheng

    Optics Letters
    |May 1, 2026
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    Summary

    We developed a cryogenic Holmium: Yttrium Lithium Fluoride (Ho:YLF) picosecond chirped-pulse amplification system. This high-power laser system achieves 205 W average power, demonstrating efficient energy extraction and excellent beam quality for advanced applications.

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    Area of Science:

    • Laser Physics and Photonics
    • Materials Science (e.g., Ho:YLF crystals)
    • Cryogenic Engineering

    Background:

    • Development of high-power, high-energy pulsed laser systems is crucial for various scientific and industrial applications.
    • Ho:YLF lasers offer potential for efficient operation in the mid-infrared spectrum, but thermal management can be a challenge at high repetition rates.
    • Cryogenic cooling and in-band pumping are advanced techniques to enhance laser performance and mitigate thermal issues.

    Purpose of the Study:

    • To demonstrate a high-average-power, high-energy cryogenic Ho:YLF picosecond chirped-pulse amplification (CPA) system.
    • To investigate the effectiveness of integrating cryogenic cooling with in-band pumping for improved laser gain and thermal management.
    • To achieve high compressed average power, high extraction efficiency, and excellent beam quality at a 1 kHz repetition rate.

    Main Methods:

    • Utilized a Ho:YLF gain medium integrated with a cryogenic cooling system.
    • Employed in-band pumping to enhance pumping efficiency and reduce thermal loading.
    • Implemented a picosecond chirped-pulse amplification architecture for high peak and average power generation.
    • Measured system performance including compressed average power, pulse duration, extraction efficiency, and beam quality (M²).

    Main Results:

    • Achieved a maximum compressed average power of 205 W at a 1 kHz repetition rate.
    • Delivered pulses with a duration of 1.7 picoseconds.
    • Demonstrated a high extraction efficiency of 41.2%.
    • Obtained near-diffraction-limited beam quality with an M² value of 1.14.

    Conclusions:

    • The integration of cryogenic cooling and in-band pumping effectively addresses thermal management challenges in high-power Ho:YLF CPA systems.
    • The developed system represents a significant advancement in high-energy picosecond laser technology, offering high average power and excellent beam quality.
    • This cryogenic Ho:YLF CPA system is well-suited for demanding applications requiring high-power ultrashort pulses.