The performances of a spectrometer for the observation of laser plasma absorption with high spectral and spatial resolution are described. Aspherical optics are used to correct the astigmatism in an extended spectral region. In this way only a small portion of the absorbing medium is probed, thus giving a good selection of the ionization stage acting as the absorption. Moreover, in the focal plane the plasma emission from the absorbing medium is spatially separated from the probe beam, with a consequent enhancement of the measurement sensitivity. The predicted optical performances from a ray tracing are compared with experimental observations for both spectral and spatial resolution.
© 2000 Optical Society of America
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(050.1950) Diffraction and gratings : Diffraction gratings
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(350.5400) Other areas of optics : Plasmas
Paolo Villoresi, Piergiorgio Nicolosi, and Maria-Guglielmina Pelizzo, "Design and experimental characterization of a high-resolution instrument for measuring the extreme-UV absorption of laser plasmas," Appl. Opt. 39, 85-93 (2000)