21 February 2011 Complete measurement of nanosecond laser pulses in time
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It is relatively straightforward to completely measure both long (>10ns) and very short (<100ps) laser pulses in time. But intermediate pulse lengths-that of the most common laser pulses- remain nearly immeasurable and, not coincidentally, correspond to the least stable of all lasers. True, ultrahigh-bandwidth oscilloscopes and streak cameras can now resolve such pulses, but such exotic electronic devices are expensive and fragile and only yield the temporal intensity and not the temporal phase. Here we describe a simple, elegant, accurate, complete, compact, all-optical, entirely passive, and single-shot FROG device that solves the problem. It simultaneously achieves a very large delay range of ~10ns and very high spectral resolution of <1pm. It accomplishes both feats using high-efficiency, high-finesse etalons, the first to tilt the pulse by 8⪅9, .t9hat is, by several meters over a centimeter beam, and another to generate massive angular dispersion for a high-resolution spectrometer. We demonstrate this device for measuring pulses 100ps to several ns long from a fiber-amplified micro-disk laser.
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Pamela Bowlan, Rick Trebino, "Complete measurement of nanosecond laser pulses in time", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140V (21 February 2011); doi: 10.1117/12.875334; https://doi.org/10.1117/12.875334

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