Broadband second harmonic generation of an optical frequency comb produced by four-wave mixing in highly nonlinear fibers

• Published in: Optics communications Vol. 283; no. 7; pp. 1459 - 1462
• Main Authors: Cruz, Flavio C., Marconi, Jorge D., Cerqueira S., Arismar, Fragnito, Hugo L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2010; Elsevier
• Subjects: Birefringence; Broadband; Conversion; Crystals; Exact sciences and technology; Frequency combs; Frequency conversion ; harmonic generation, including high-order harmonic generation; Fundamental areas of phenomenology (including applications); Multiple four-wave mixing; Nonlinear optics; Nonlinearity; Optical frequency; Optics; Phase conjugation, optical mixing; photorefractive and kerr effects; Physics; Second harmonic generation; Spectra; Wave optics; Multiple four-wave mixing; Frequency combs; Second harmonic generation; Nonlinear optics; Single frequency laser; Non linear material; Optical phase matching; Four-wave mixing; Optical frequency; Birefringence; Optical materials; Optical frequency conversion; Normal incidence
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2009.11.050

We demonstrate broadband second harmonic generation of low-energy pulses produced by injecting two single-frequency lasers into a highly nonlinear fiber. Full nonlinear conversion of the corresponding spectra, consisting of broadband (∼200 nm) optical frequency combs at ∼1580 nm, were obtained by using conventional birefringence phase-matching in two BIBO crystals (2-mm and 100-μm long) with a normal incidence configuration. The crystals were not tilted and the pulses were not compressed. This broadband conversion results from the large phase-matching bandwidth of the nonlinear BIBO crystals at ∼1550 nm, but also seems to be a consequence of a fundamental comb with small spectral phase variation.