Y. Pertot

Pencil lead plasma for generating multimicrojoule high-order harmonics with a broad spectrum

Using the plasma harmonic method, we show the generation of efficient and intense high-order harmonics from plasma of pencil lead. We demonstrate multimicrojoule energy in each harmonic order for the 11th to the 17th order of a Ti:sapphire laser. By analyzing the target morphology and the plasma composition, we conclude that these intense harmonics are generated from nanoparticles of graphitic carbon.

Generation of continuum high-order harmonics from carbon plasma using double optical gating

We demonstrated continuum high-order harmonics from carbon plasma using the double optical gating method. The extreme ultraviolet continuum covered 17‐25 eV. The observation of such continuum is the first step towards the generation of high-flux single attosecond pulses from plasma harmonics. (Some figures may appear in colour only in the online journal)

Multi-µJ coherent extreme ultraviolet source generated from carbon using the plasma harmonic method

We demonstrate intense high-order harmonic generation from plasma that is created from different carbon targets. We obtain high-order harmonic energy in the multi-microjoule range for each harmonic order from the 11th to the 17th harmonic. By analyzing the target morphology and the plasma composition, we conclude that the intense harmonics from the bulk carbon targets originate from nanoparticles target.

Carbon molecules for intense high-order harmonics from laser-ablated graphite plume

Author(s): Fareed, MA; Mondal, S; Pertot, Y; Ozaki, T | Abstract:

Suppression of resonant-induced harmonics of tin with tunable laser wavelengths

We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.

Highly efficient high-order harmonics with large cutoff from carbon molecules using various laser wavelengths

Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm-1.71 μm wavelengths. By driving plasma of reduced size (~200μm) with 1.71μm laser, we could extend the cutoff to ~70eV, while reducing the peak intensity by only ~31%.

Continuously tunable redshift of high-order harmonics from carbon plasma

We observe continuous and strong redshift of high-order harmonics generated from carbon plasma, which may explain the high conversion efficiency that result from a resonance close to the pump laser wavelength.

Intense high-order harmonics from carbon plasma for intense attosecond pulse generation

Summary form only given. Generation of intense isolated attosecond pulses is of significant importance to explore new domains in attosecond science. Recently, we have demonstrated high-order harmonic generation (HHG) with high conversion efficiency using low-density plasma as the nonlinear medium [1,2], instead of gas. However, isolated attosecond pulses have yet to be demonstrated from plasma. In this work, we apply the Double Optical Gating (DOG) [3] method to generate continuum high-order harmonics from lowly ionized carbon plasma, which is the first step toward the generation of intense attosecond pulses.

Blueprint for generating intense attosecond pulses using high-order harmonics from graphitic carbon plasma

We report the generation of extremely efficient (>; 10-4), multi -μJ high -order harmonics from graphitic carbon plasma, which spans over five harmonic orders. This broad bandwidth is ideal for generating intense single-cycle attosecond pulses.