Single-shot, high-resolution, fiber-based phase-diversity photodetection of optical pulses

C. Dorrer; L. J. Waxer; A. Kalb; E. M. Hill; J. Bromage

doi:10.1117/12.2208353

9 March 2016 Single-shot, high-resolution, fiber-based phase-diversity photodetection of optical pulses

C. Dorrer, L. J. Waxer, A. Kalb, E. M. Hill, J. Bromage

Proceedings Volume 9732, Real-time Measurements, Rogue Events, and Emerging Applications; 97320P (2016) https://doi.org/10.1117/12.2208353
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

Temporally characterizing optical pulses is an important task when building, optimizing, and using optical sources. Direct photodetection with high-bandwidth photodiodes and real-time oscilloscopes is only adequate for optical pulses longer than ~10 ps; diagnostics based on indirect strategies are required to characterize femtosecond and sub-10-ps coherent sources. Most of these diagnostics are based on nonlinear optics and can be difficult to implement for the single-shot characterization of nonrepetitive events. A temporal diagnostic based on phase diversity is demonstrated in the context of picosecond high-energy laser systems, where single-shot pulse measurements are required for system safety and interpretation of experimental results. A plurality of ancillary optical pulses obtained by adding known amounts of chromatic dispersion to the pulse under test are directly measured by photodetection and processed to reconstruct the input pulse shape. This high-sensitivity (~50-pJ) diagnostic is based on a pulse replicator composed of fiber splitters and delay fibers, making it possible to operate with fiber sources and free-space sources after fiber coupling. Experimental data obtained with a high-bandwidth real-time oscilloscope demonstrate accurate characterization of pulses from a high-energy chirped-pulse amplification system, even for pulses shorter than the photodetection impulse response.

Citation Download Citation

C. Dorrer, L. J. Waxer, A. Kalb, E. M. Hill, and J. Bromage "Single-shot, high-resolution, fiber-based phase-diversity photodetection of optical pulses", Proc. SPIE 9732, Real-time Measurements, Rogue Events, and Emerging Applications, 97320P (9 March 2016); https://doi.org/10.1117/12.2208353

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KEYWORDS

Photodetectors

Picosecond phenomena

Diagnostics

Oscilloscopes

Dispersion

Composites

Near field optics

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