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Time-delay compensated monochromator for the spectral selection of extreme-ultraviolet high-order laser harmonics
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Image of FIG. 1.
FIG. 1.

The geometry of the off-plane mount. Inset: the blaze condition.

Image of FIG. 2.
FIG. 2.

Optical design (a) and schematic view of the TDCM (b).

Image of FIG. 3.
FIG. 3.

Image of the off-plane diffraction in the output focal plane of the TDCM (a) and plot along the vertical direction of the CCD of the signal integrated from column 30 to 60 (b).

Image of FIG. 4.
FIG. 4.

TDCM efficiency at order 1 (a) and relative efficiency at orders 0 and −1 (b).

Image of FIG. 5.
FIG. 5.

HH spectrum in Ar acquired with the CEM detector placed at the exit of the TDCM. The IR laser energy was . The intermediate slit was open at .

Image of FIG. 6.
FIG. 6.

Image of H17 (47 nm) in the TDCM output focal point with the slit open at : focal spot averaged over 100 laser shots (100 ms integration time) (a); cross section on the horizontal direction, (b); cross section on the vertical direction, (c).

Image of FIG. 7.
FIG. 7.

Experimental setup to measure the temporal duration of the XUV pulse at the TDCM output. The dashed and solid lines indicate IR and XUV radiation, respectively.

Image of FIG. 8.
FIG. 8.

Photoelectron energy spectrum as a function of the delay between the XUV and IR pulses in the case of H19.


Generic image for table
Table I.

Parameters of the toroidal mirror (a) and of the spherical variable-line-spaced (SVLS) grating (b).

Generic image for table
Table II.

Optical performances and analysis of the path-length compensation of the TDCM. The source divergence is 8 mrads. indicates the FWHM aberrations of the spot at the output. and indicate the FWHM spread of the path lengths at the intermediate slit and at the output, respectively.

Generic image for table
Table III.

Number of photons per laser shot measured with a calibrated XUV photodiode at the exit of the TDCM. The pump pulse energy was at a 1 kHz repetition rate. The uncertainty on the photocurrent measurements is ±10%. The number of photons generated at the input of the TDCM and the IR-XUV conversion efficiency are also reported.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-delay compensated monochromator for the spectral selection of extreme-ultraviolet high-order laser harmonics