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An Inexpensive, Reflective, Image Rotator

Volume 32, Number 4 (Aug. 1978) Page 405-405

Holcombe, J.A.


In many spectroscopic experiments, a 90° rotation of the source image is often desired. The rotation may serve to transfer a radially symmetrical source image onto a spectrograph entrance slit to obtain spacially resolved spectral lines for subsequent source profiling using Abel inversion techniques. Conversely, profiling of a source exhibiting horizontal homogeneity with spectral variation in the vertical plane may be most adequately treated using an image rotator. Using direct transfer optics, a limiting aperature is often placed at the monochromator entrance slit to define a spacial region. This procedure greatly reduces the radiant flux reaching the detector and can present a significant problem for weak signals. By rotating the source image, the monochromator slitwidth now defines the spacial resolution and permits the use of taller slits for optimal throughput.