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We present a new and simple technique for efficient stretching of Q-switched laser pulses using a novel ring resonator and a variable Pockels cell Q-switch driven by a simple circuit. The production of 10-mJ flat-topped Q-switched pulses with a duration that can be stretched by a factor of 4.5-1.8 mus without loss of pulse energy is demonstrated. We show that the pulse stretching agrees well with...
We describe a new laser design for a 50 W laser guide star source, suitable for large aperture telescopes employing multi conjugate adaptive optics systems. Design verification experiments will be presented showing bandwidth control and progress towards power scaling.
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