Experimental investigation of size broadening of a K x-ray source produced by high intensity laser pulses.

The size of a hard K x-ray source ([Formula: see text] = 17.48 keV) produced by a high intensity femtosecond laser interacting with a solid molybdenum target is experimentally investigated for a wide range of laser intensity (I ~ 10-2.8 × 10 W/cm) and for four values of the temporal contrast ratio (6.

Exploring phase contrast imaging with a laser-based K x-ray source up to relativistic laser intensity.

This study explores the ability of a hard K x-ray source (17.48 keV) produced by a 10 TW class laser system operated at high temporal contrast ratio and high repetition rate for phase contrast imaging. For demonstration, a parametric study based on a known object (PET films) shows clear evidence of feasibility of phase contrast imaging over a large range of laser intensity on target (from ~10 W/cm to 7.

High photon flux Kα Mo x-ray source driven by a multi-terawatt femtosecond laser at 100 Hz.

We develop a pulsed hard x-ray K source at 17.4 keV produced by the interaction of a multi-terawatt peak power infrared femtosecond laser pulse with a thick molybdenum (Mo) target at a 100 Hz repetition rate. We measure the highest Mo K photon production reported to date corresponding to a K photon flux of 1×10  ph/(sr·s) and an estimated peak brightness of ∼2.

Impact of the pulse contrast ratio on molybdenum K generation by ultrahigh intensity femtosecond laser solid interaction.

We present an extended experimental study of the absolute yield of K x-ray source (17.48 keV) produced by interaction of an ultrahigh intensity femtosecond laser with solid Mo target for temporal contrast ratios in the range of 1.7 × 10-3.

Crossing the threshold of ultrafast laser writing in bulk silicon.

An important challenge in the field of three-dimensional ultrafast laser processing is to achieve permanent modifications in the bulk of silicon and narrow-gap materials. Recent attempts by increasing the energy of infrared ultrashort pulses have simply failed. Here, we establish that it is because focusing with a maximum numerical aperture of about 1.