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Proceedings Paper

SPDC correlated photon source filtered for narrowed bandwidth using volume Bragg grating
Author(s): Oliver Slattery; Paulina Kuo; Yong-Su Kim; Lijun Ma; Xiao Tang
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Paper Abstract

A Volume Bragg Grating (VBG) can be used to efficiently extract a narrow bandwidth, highly collimated beam from an otherwise broad spectrum beam. We use a VBG to extract a narrow bandwidth of signal spectrum from a broadband Spontaneous Parametric Down-Conversion source to optimally match the narrow detection bandwidth of our idler upconversion detector. Improved coincidence count rates and visibility can be achieved when limiting signal-spectrum detection to the narrow signal bandwidth whose photons are correlated with a narrow idler-spectrum bandwidth that has been selected by the up-conversion detector. We compare coincidence count rate and visibility for when the entire signal spectrum is detected and when the spectrum has been filtered by the VBG. We further relax the collection techniques and show that following the VBG, the coincidence count rate improves with minimal loss in visibility compared to when the entire spectrum is detected. We introduce our initial efforts at using the VBG to further narrow the signal spectrum by placing it inside a multipass cavity. Additionally, we further adapt the single photon level up-conversion spectrometer, previously developed for idler spectrum measurement, to indirectly measure the single photon level signal spectrum. We verify its capability for several different wavelength and linewidth selections.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8518, Quantum Communications and Quantum Imaging X, 85180Y (15 October 2012); doi: 10.1117/12.944223
Show Author Affiliations
Oliver Slattery, National Institute of Standards and Technology (United States)
Paulina Kuo, National Institute of Standards and Technology (United States)
Yong-Su Kim, National Institute of Standards and Technology (United States)
Lijun Ma, National Institute of Standards and Technology (United States)
Xiao Tang, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 8518:
Quantum Communications and Quantum Imaging X
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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