Control of signal coherence in parametric frequency mixing with incoherent pumps: Narrowband mid-infrared light generation by downconversion of broadband amplified spontaneous emission source at 1550 nm

Year: 2012

Authors: Wabnitz S., Picozzi A., Tonello A., Modotto D., Millot G.

Autors Affiliation: Department of Information Engineering, Università di Brescia, Brescia 25123, Italy; Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Bourgogne, Dijon 21078, France; Xlim, Université de Limoges, Limoges 87060, France

Abstract: We study, with numerical simulations using the generalized nonlinear envelope equation, the processes of optical parametric and difference- and sum-frequency generation (SFG) with incoherent pumps in optical media with both quadratic and third-order nonlinearity, such as periodically poled lithium niobate. With ultrabroadband amplified spontaneous emission pumps or continua (spectral widths >10 THz), group-velocity matching of a near-IR pump and a short-wavelength mid-IR (MIR) idler in optical parametric generation may lead to more than 15-fold relative spectral narrowing of the generated MIR signal. Moreover, the SFG process may also lead to 6-fold signal coherence improvements. When using relatively narrowband filtered noise pumps (e.g., spectral widths < 1THz), the signal from optical parametric, sum-frequency, and difference-frequency generation has nearly the same spectral width as that of the incoherent pump. Journal/Review: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B: OPTICAL PHYSICS

Volume: 29 (11)      Pages from: 3128  to: 3135

KeyWords: Acoustooptical devices; Interferometry; Mixer circuits; Nonlinear equations; Nonlinear optics; Optical frequency conversion; Spontaneous emission, Amplified spontaneous emissions; Broadband amplified spontaneous emission sources; Difference-frequency generation; Nonlinear envelope equations; Optical parametric generation; Periodically poled lithium niobate; Sum frequency generation; Third-order non-linearity, Pumps
DOI: 10.1364/JOSAB.29.003128

Citations: 12
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