McPherson’s Model 251MX is described as a high-energy optical spectroscopy power tool for water window imaging, HHG laser spectroscopy, x-ray plasma diagnostics, extreme ultraviolet lithography, optical characterization, metrology, and calibration. The Model 251MX is reported as being easy to use and delivers results over a 0.5 nm to 150 nm range by indexing diffraction gratings.
The McPherson Model 251MX is optimized for high energy photons including soft x-ray and extreme UV (EUVL). The Model 251MX does not scan with point detectors, it works exclusively with microchannel plate intensifiers (MCP) and/or direct detection CCD array detectors. Regardless of type, the detector is located on a flat focal plane. The aberration correction provides flat field and straight spectral lines ideal for planar detectors and good spectral resolution.
Diffractions gratings are from holographic masters and the laminar groove profile provide a useful feature. Laminar grating grooves have a profile that looks like a square wave. Laminar grating diffraction efficiency in even orders of light is lower than either sawtooth or sinusoidal profiles. This helps keep a high energy spectrum clean and more easily interpretable – especially at short wavelengths. For brighter illuminations, peruse the Model 251MX datasheet.