Reduction in timing jitter for a Cr:YAG Q-switched Nd:YAG laser
2010
To address the issue of pulse-to-pulse timing jitter in a passively Q-switched Cr:YAG/Nd:YAG laser, we have
developed a technique for optical triggering, where the energy from a single bar diode was used to bleach a thin sheet
within the Cr:YAG saturable absorber from a direction orthogonal to the lasing axis. A strong anisotropy for bleaching
effect was observed; with appropriate polarization of the bleaching light the transmission through the saturable absorber
was increased from 45% to 63%. This technique was applied to a monolithic Cr:YAG/Nd:YAG laser operating under
steady state conditions. By placing the Q-switched pulse at the time corresponding to the steepest slope for change in
transmission during bleaching, which occurs ~1μs after the bleaching diode trigger, we measured an 12.5X reduction in
the pulse-to-pulse timing jitter, from 100ns for free running operation to 8ns with optical triggering.
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