Widely tunable broadband deep-ultraviolet to visible wavelength generation by the cross phase modulation in a hollow-core photonic crystal fiber cladding

Abstract

The deep-ultraviolet (UV) to visible wavelengths are efficiently generated for the first time by the cross phase modulation (XPM) between the red-shifted solitons and the blue-shifted dispersive waves (DWs) in the fundamental guided mode of the multi-knots of a hollow-core photonic crystal fiber cladding (HC-PCFC). When the femtosecond pulses with a wavelength of 850 nm and average power of 300 mW are coupled into the knots 1–3, the conversion efficiency ηuv−v of 11% and bandwidth Buv−v of 100 nm in the deep-UV region are experimentally obtained. The multi-milliwatt ultrashort pulses are tunable over the deep-UV (below 200 nm) to visible spectral region by adjusting the wavelengths of the pump pulses in different knots. It is expected that these widely tunable broadband ultrashort deep-UV–visible pulse sources could have important applications in ultrafast photonics, femtochemisty, photobiology, and UV–visible resonant Raman scattering.

Energetic mid-IR femtosecond pulse generation by self-defocusing soliton-induced dispersive waves in a bulk quadratic nonlinear crystal

“…They were also used for wavelength conversion, especially in the short-wavelength side of the soliton (normal dispersion regime) [22][23][24]. Inside specially designed photonic crys- tal fibers with small cores and double zero-dispersion wavelengths, fiber-based DWs located to the red side of the soliton were also reported [25][26][27], and with a NIR pump, the longest obtained emission wavelength is about 2.2 µm [27]. One of the major limitations of fiber-based DW generation is the limited pulse energy, especially for DW generation on the red side, which requires fibers with double zero-dispersion wavelengths.…”