1. Instrumentation for analysis and utilization of extreme-ultraviolet and soft x-ray high-order harmonics.
- Author
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Poletto, L., Bonora, S., Pascolini, M., and Villoresi, P.
- Subjects
- *
ULTRAVIOLET spectrometry , *MONOCHROMATORS , *X-rays , *ELECTRICAL harmonics , *ULTRAVIOLET radiation , *DETECTORS , *SPECTROMETERS , *SPECTRUM analysis - Abstract
The design and the performances of an extreme ultraviolet (EUV)spectrometer/monochromator for generation and diagnostics of high-order harmonics of an ultrashort (<30 fs) pulsed laser focused onto a gas jet are presented. The harmonic generation is optimized using an adaptive mirror before the laser focusing stage. A toroidal mirror is used to focus the XUV radiation in an intermediate stage for pump/probe experiments. A grazing-incidence flat-field spectrometer for the 5–75 nm spectral region has been designed: it adopts a stigmatic toroidal mirror and a varied line-space flat grating mounted in converging light. The almost flat stigmatic spectrum is acquired by a 40-mm-diameter microchannel plate intensifier; the whole detector can be moved to scan various portions of the spectrum. Different detectors allow one to acquire both integrated and single shot spectra at 1 kHz repetition rate. The absolute calibration of the spectrometer is provided. The same optical scheme can be applied to the design of a constant deviation angle EUV monochromator by substituting the detector block with an exit slit. [ABSTRACT FROM AUTHOR]
- Published
- 2004
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