MS257 In Stock

The Newport MS257 is an Oriel 1/4m Imaging Spectrograph designed to meet the demands of critical applications and extended wavelength range scanning. As a true flat field spectrograph, it boasts a flat axis image plane and an oversized focusing mirror, ensuring optimal performance. The instrument serves as the core of a fully automated spectral data acquisition system, requiring only a PC and detector system to operate efficiently. With an F/3.9 configuration and a focal length of 257 mm, the MS257 can be used as a imaging spectrograph, true flat field spectrograph, or monochromator.

The MS257 accommodates up to four diffraction gratings, covering a wide wavelength range from 200 nm to 200 um. Users can easily set up the instrument for automatic selection of input and output ports, filter wheels, filters, and gratings during scanning processes. The MS257's high-speed stepper motor drive and precision worm gear ensure stability and repeatability, with grating position accuracy typically better than 0.15 nm. Additionally, when using a 1200 line/mm grating, it can have a 0.06 nm wavelength repeatability. The calibration process, involving grating drive "mapping" using an interferometer, ensures compliance with specifications.

Designed with an in-plane Czerny-Turner configuration that is asymmetric and a 3.9 input F-number, the MS257 offers highly efficient throughput. It has an exit focal length of 257.4 mm and an input focal length of 220.0, both with twice the dispersion of a 1/8 m spectrograph. The instrument effectively eliminates stray light caused by reflections from a camera window or internal optics, essential to maintain spectral purity and optimal performance. Reflectors are coated with AIMgF2 for enhanced UV efficiency, and the MS257's design employs corrected toroidal reflectors to minimize coma over the entire working range, ensuring optimal imaging capabilities.

The MS257 features a fine focus adjustment knob, allowing users to achieve the best focus on an exit slit and translate the mirror exit in the field. This capability optimizes image location on a focal plane detector, such as a CCD or diode array. The instrument's corrected optics were specifically designed for point-to-point spectrographic imaging, correcting for astigmatism and enabling simultaneous resolution and diffraction of various sources as separate spectra on a CCD. The MS257 offers one input port and up to two output ports, both lateral and axial. The axial port provides the highest throughput, while the lateral output port offers greater flexibility for mounting components outside the instrument.