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Energy-scalable temporal cleaning device for femtosecond laser pulses based on cross-polarized wave generation
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Image of FIG. 1.
FIG. 1.

Waveguide XPW set-up.

Image of FIG. 2.
FIG. 2.

Internal XPW efficiencies as a function of the input energies for the four different laser sources used. Theoretical curve in the case of laser (2) was obtained with a home-made simulation code. Maximum XPW output energy for each laser is shown on top of the plots. Fiber transmission and reflection losses are taken into account.

Image of FIG. 3.
FIG. 3.

Input (dotted line) and XPW (solid line) spectra for the four laser chains used.

Image of FIG. 4.
FIG. 4.

Self-referenced spectral interferometry (Wizzler, Fastlite) temporal measurements of laser (1) and output XPW pulse plotted on (a) linear scale (respectively, 50 fs and 20 fs) and (b) logarithmic scale (respectively, solid and dashed line); (c) 3ω-autocorrelation trace of the pulse temporal profile before (dots) and after (squares) XPW for laser (4).

Image of FIG. 5.
FIG. 5.

Typical near-field (a) and far-field (b) XPW beam profiles measured with LOA1 laser chain.

Image of FIG. 6.
FIG. 6.

Measured and simulated beam propagation from fiber output end to XPW crystal (respectively, red diamonds and dashed line), and after XPW crystal: fundamental (respectively, dots and dashed-dotted line), and XPW (respectively, triangles and solid line).

Image of FIG. 7.
FIG. 7.

Measured (top row) and simulated (bottom row) XPW beam profiles at the crystal position (respectively, (a) and (d)), at the refocusing position (≈ 7 cm away from the crystal) (respectively, (b) and (e)) and 65 cm after the crystal (respectively, (c) and (f)). Beam profiles were measured with Thales Optronique Femtocube laser source and simulated ones were obtained with CommodPro software.


Generic image for table
Table I.

Characteristics of the laser sources used for the experiment. Central wavelength is around 800 nm.

Generic image for table
Table II.

XPW filter performances for the different laser sources used. Energy throughput represents the global transmission of the set-up. Spectral broadening is defined as the ratio of the full-width at half-maximum (FWHM) of the XPW spectrum over the FWHM of the incident laser spectrum.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy-scalable temporal cleaning device for femtosecond laser pulses based on cross-polarized wave generation