An impulse measurement device and analysis package was conceived, designed, constructed, tested, and demonstrated to be capable of: measuring nanoNewton‐seconds to milliNewton‐seconds of impulse due to laser‐ablation; being transported as carry‐on baggage; set‐up and tear‐down times of less than an hour; target exchange times of less than two minutes (targets can be ablated at multiple positions for thousands of shots); measurements in air and in vacuum; error of just a few percent; repeatability over a wide range of potential systematic error sources; and time between measurements, including ring‐down and analysis, of less than 30 seconds. The instrument consists of a cantilever (i.e. leaf spring), whose time‐dependent displacement/oscillation is measured and analyzed to determine the impulse imparted by a laser pulse to a target. These shapes are readily/commercially available, and any target material can be used, provided it can be fashioned in the form of a cantilever, or as a coating/film/tape, suitable for mounting on a cantilever of known geometry. The instrument was calibrated both statically and dynamically, and measurements were performed on brass, steel, and Aluminum, using laser pulses of ∼7  ns , ∼500  ps , and ∼500  fs . The results agree well with those published in the literature, with surface effects, atmosphere, and pre‐/post‐pulses demonstrating interesting effects and indicating areas for further study. These parameters should be carefully controlled and held constant during a series of measurements. The impulse imparted by ablation due to laser filaments in air was also explored.


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    Title :

    Compact And Robust Laser Impulse Measurement Device, With Ultrashort Pulse Laser Ablation Results


    Contributors:

    Conference:

    BEAMED ENERGY PROPULSION: Fifth International Symposium on Beamed Energy Propulsion ; 2007 ; Kailua‐Kona (Hawaii)


    Published in:

    AIP Conference Proceedings ; 997 , 1 ; 147-158


    Publication date :

    2008-04-28


    Size :

    12 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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