Investigation of long wavelength mid-infrared generation in the tight focusing limit.

An ultrafast coherent long wavelength MIR source based on difference frequency generation was demonstrated. An average power of 2.5 mW at ∼18 µm was achieved. The angular distribution of the generated MIR source under the condition of tight-focusing limit shows the onset of conical emission of the MIR beam due to on-axis phase mismatching.

Generation of 400 µW at 17.5 µm using a two-color Yb fiber chirped pulse amplifier: erratum.

An Erratum is presented to correct the reported [Opt. Lett.36, 1080 (2011)OPLEDP0146-959210.1364/OL.36.001080] power of the generated long wavelength, mid-infrared power.

Tunable mid-infrared source from an ultrafast two-color Yb:fiber chirped pulse amplifier: erratum.

This Erratum is presented to correct the reported [Opt. Lett.37, 3570 (2012)] power of the generated long wavelength, mid-infrared power.

Tunable mid-infrared source from an ultrafast two-color Yb:fiber chirped-pulse amplifier.

We present a tunable, ultrafast, mid-infrared source based on difference frequency between 16 µm and 20 µm from an ultrafast, two-color Yb:fiber chirped-pulse amplifier. We have recorded an average power of 1.5 mW at ∼18 µm. We have improved the output power after the pre-amplifier by one order of magnitude. We present the simulation and experimental results to the pre-amplifier.

Anti-Stokes enhancement of multifrequency Raman generation in a hollow fiber.

The intensities of the higher frequency anti-Stokes components of resonantly pumped Raman scattering are observed to be greatly enhanced as a result of minimizing dispersion when focusing into a hollow fiber, as compared to their intensities at higher pressures. As well, the significant spectral broadening of these Raman orders in the absence of any such broadening on the pump beams suggests the synthesis of a short temporal structure as a result of a the decreased dispersion.