The 9150 is Sciencetech's highest resolution monochromator with a 1.5 m focal length. Under optimum conditions with a 2400 l/mm grating it can achieve a resolution of 0.004 nm in single pass mode. 9150SD includes an optical module that allows the unit to be configured in a double pass mode as well, effectively doubling the focal length to 3 m and achievable resolution to 0.002 nm. It utilizes large 102 x 102 mm gratings for high light throughput (f/12 aperture). The standard model accommodates one grating on a removable, kinematic mount that allows the user to manually swap one grating for another without losing alignment. A 4 grating turret for automatic grating selection without manual service is available as an option. The 9150 has a flat field output allowing it to operate as a spectrograph using a linear array, multi-channel detector to capture the entire output spectrum at once. Sciencetech provides a selection of 1" wide CCD and photo-diode linear array detectors mounted on a multi-axis adjustable focusing platform for use with the 9150.

 Vacuum Operation For ultraviolet light applications, it is best to operate the monochromator in a vacuum environment to eliminate water vapor absorption. An optional vacuum version allows the Sciencetech 9150 to operate in a 10^-7 Torr environment for ultra-violet applications. Please note this option only allows the entire 9150 to be placed inside a vacuum environment, and does not imply its housing is capable of maintaining a vacuum condition inside.

High Resolution Slits One manual, high resolution, bilaterally adjustable slit for the input port is standard. The slit is manually adjustable from 0-6 mm with a micrometer thumbwheel. The maximum slit height is 38mm, but can be reduced through an optional height adjustable stepwise cover. A computer controlled, motorized version of the high resolution bilaterally adjustable slit is available as an option (SS83-HR). An additional slit (SS82-HR) is required for the output port if the 9150 is used as a monochromator with a single-channel detector mounted at the output. An additional slit is not required if the 9150 is used as a spectrograph with a multi-channel detector mounted at the output port.

Double Pass Configuration In Double Pass configuration, the light beam essentially repeats the Czerny-Turner optical path twice inside the monochromator before exiting the output port. The first pass is identical to the standard single pass configuration, except only the top half of the entrance slit is used. The output from the first pass, instead of being focused to the output port, is re-directed through a special return mirror system through an intermediate slit and back to the input mirror for a second pass. After the second pass, the light beam focuses at the output port, passing above the special return mirror system. Please note that light beam height is only half that for the single pass configuration due to the shared vertical placement of the special return mirror system and output port. The intermediate slit in the return mirror system minimizes stray light. This intermediate slit width is manually adjustable, but is generally set to the maximum width allowable for the application.

 Grating Choices A wide selection of 102 x 102 mm gratings are available. These include ruled gratings (150 l/mm, 300 l/mm, 600 l/mm, 1200 l/mm) and holographic gratings (1800 l/mm, 2400 l/mm). Selected gratings are also available gold or aluminum coated.