Tunable light source from large band conversion of continuum in a quadratic crystal

Abstract

International audienceWe consider the conversion of broadband infrared light, generated from photonic crystal fibers, into visible pulses, through frequency conversion in quadratic biaxial crystals. We exploit the nonlinear envelope technique to predict cubic and quadratic ultrabroadband dynamics and to guide the experiments. The combination of photonic crystal fibers and quadratic crystals provides the possibility to produce signal wavelengths with a great flexibility

Infrared supercontinuum frequency doubling via nonlinear Raman-Nath and Cerenkov scattering processes

“…In fact, quadratic nonlinearities can be properly engineered to generate waves with predetermined temporal duration, spectral and spatial shapes, and synchronization [9,10]. The concatenation of fibers with quadratic crystals has recently allowed to generate narrowbandwidth wavelength distributions from the UV to the near infrared [11][12][13][14] and to extend the near infrared SC in the visible region [15].…”

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

“…The possibility of controlling and improving the coherence of a signal in the process of parametric frequency conversion using incoherent pumps is presently of special applicative interest, in view of the availability of relatively inexpensive broadband noise sources based on filtered amplified spontaneous emission (ASE) in optical fiber amplifiers or continua generated by diode-pumped photonic crystal fibers [23].…”