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Proceedings Paper

An optically passive method that doubles the rate of 2-Ghz timing fiducials
Author(s): R. Boni; J. Kendrick; C. Sorce
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Paper Abstract

Solid-state optical comb-pulse generators provide a convenient and accurate method to include timing fiducials in a streak camera image for time base correction. Commercially available vertical-cavity surface-emitting lasers (VCSEL’s) emitting in the visible currently in use can be modulated up to 2 GHz. An optically passive method is presented to interleave a time-delayed path of the 2-GHz comb with itself, producing a 4-GHz comb. This technique can be applied to VCSEL’s with higher modulation rates. A fiber-delivered, randomly polarized 2-GHz VCSEL comb is polarization split into s-polarization and p-polarization paths. One path is time delayed relative to the other by twice the 2-GHz rate with ±1-ps accuracy; the two paths then recombine at the fiber-coupled output. High throughput (≥90%) is achieved by carefully using polarization beam-splitting cubes, a total internal reflection beam-path–steering prism, and antireflection coatings. The glass path-length delay block and turning prism are optically contacted together. The beam polarizer cubes that split and recombine the paths are precision aligned and permanently cemented into place. We expect the palm-sized, inline fiber-coupled, comb-rate–doubling device to maintain its internal alignment indefinitely.

Paper Details

Date Published: 24 August 2017
PDF: 6 pages
Proc. SPIE 10390, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI, 1039003 (24 August 2017); doi: 10.1117/12.2275698
Show Author Affiliations
R. Boni, Univ. of Rochester (United States)
J. Kendrick, Univ. of Rochester (United States)
C. Sorce, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 10390:
Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI
Jeffrey A. Koch; Gary P. Grim, Editor(s)

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