Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals.
We propose a novel method for generating broadband spontaneous parametric fluorescence by using a set of bulk nonlinear crystals (NLCs). We also demonstrate this scheme experimentally. Our method employs a superposition of spontaneous parametric fluorescence spectra generated using multiple bulk NLCs. A typical bandwidth of 160 nm (73 THz) with a degenerate wavelength of 808 nm was achieved using two β-barium-borate (BBO) crystals, whereas a typical bandwidth of 75 nm (34 THz) was realized using a single BBO crystal. We also observed coincidence counts of generated photon pairs in a non-collinear configuration. The bandwidth could be further broadened by increasing the number of NLCs. Our demonstration suggests that a set of four BBO crystals could realize a bandwidth of approximately 215 nm (100 THz). We also discuss the stability of Hong-Ou-Mandel two-photon interference between the parametric fluorescence generated by this scheme. Our simple scheme is easy to implement with conventional NLCs and does not require special devices.
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan.
Masayuki
M
Okano
Ryo
R
Okamoto
Akira
A
Tanaka
Shanthi
S
Subashchandran
Shigeki
S
Takeuchi
D001464:Barium / Q000737:chemistry*; D001888:Boric Acids / Q000737:chemistry*; D003460:Crystallization; D008422:Materials Testing; D017711:Nonlinear Dynamics; D012031:Refractometry; D013050:Spectrometry, Fluorescence / Q000379:methods*
D001888:Boric Acids; D001464:Barium; C032688:boric acid