Abstract
In general, there are two types of diffraction grating based devices for wavelength multiplexing: plane grating systems requiring focusing and collimating optics, and concave grating systems where certain aberrations normally present are corrected. The device described in this paper uses a plane grating plus a single focusing element in a monobloc configuration so that aberrations are wavelength independent. The optical system used is an on-axis Littrow configuration, where the radiation enters and leaves through apertures in the grating. For simplicity, we have called this configuration Stimax, being derived from stigmatic and maximum. The configuration is particularly appropriate in that it can be used over a very large spectral range.
© 1981 Optical Society of America
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