The difference between iHR spectrometers and other standard Czerny-Turner spectrometers can be seen at first glance. The iHR series is not just another square box in your lab. The final design, with the unique shape of the iHR series, was adopted to provide the best solution for essential parameters in imaging spectrometers: image quality, removal of re-diffracted light and maximized optical throughput.

As an imaging spectrometer, the iHR has enhanced capabilities for use with a CCD. A toroidal mirror corrects for astigmatism, allowing the
tangential (resolution optimized) and sagittal (imaging optimized) focal planes to cross at the center of the focal plane. This provides the flexibility to choose between imaging and resolution optimization (with a CCD detector) by selecting the desired detection angle. The iHR Series
has one of the largest flat fields available in an imaging spectrograph. The imaging quality over the entire flat field has been maximized by using an asymmetric layout and a patented on-axis grating drive, reducing coma and other aberrations. A larger focus mirror allows the entire flat field to be used without vignetting (no throughput reduction at the edges of the focal plane).