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. (Model 9150SD can achieve 0.002 nm in a double pass configuration that effectively doubles the focal length to 3 m.) It utilizes large 102 x 102 mm gratings for high light throughput (f/12 aperture). The standard model accommodates a grating on a removable, kinematic mount which allows the user to manually swap one grating for another without losing alignment. An optional 4 grating turret is available for automatic grating selection. 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 simultaneously. 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. 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. A computer controlled, motorized version of the high resolution bilaterally adjustable slit is available as an option (SS83-HR).

 Double Pass Configuration In the Double Pass configuration (9150SD), 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: the light enters the input slit (but only the top portion), is collimated by the input mirror, and is sent to the grating. The dispersed light from the grating is then condensed by the output mirror, but instead of being focused to the output port, a special return mirror system redirects it back to the input slit (bottom portion) for a second pass. On the second pass, the light beam is now in-line with the output port placed beneath the special return mirror system. Note that slit height is only half that of the single pass configuration due to the shared vertical placement of the special return mirror system and output port. In addition, there is an intermediate slit in the return mirror system to minimize stray light. This intermediate slit width is manually adjustable, but is generally set to the maximum width allowable in the application.

 Gratings 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.