For general-purpose laboratory work or academic applications, the Oriel 77250B Series 1/8 m Hand Operated Monochromator is a smart and economical choice. This simple, manually operated 1/8 m instrument has good resolution, low stray light and is very versatile. A large family of slits and gratings are available to meet any application's resolution, throughput, and wavelength requirements.
The 77250B is factory assembled and pre-aligned so it is ready for immediate use. Micrometer adjustable slits or fixed slit holders are installed at the input and output ports. Each diffraction grating is carefully aligned and bonded to its holder. Both the grating holder and the instrument are designed with precise mechanical tolerances, allowing gratings to be easily installed and exchanged at any time.
Each 30 x 30 mm diffraction grating comes pre-aligned in its own frame, allowing it precisely fit inside the instrument. The frame has a tab that allows the grating to be inserted or replaced inside the monochromator without touching its surface. Each grating comes with a protective cover and is labeled with the model number, making interchangeability and storage simple. The gratings listed on this page are for the 77250B and legacy 77250 monochromators only and need to be purchased separately.
The optical configuration of the 77250B results in high throughput and very low levels of stray light. The Ebert-Fastie design features two slits in line with each other, with an out of plane grating. The slit locations allow the complete optical system to be easily mounted to a bench or rail. The grating orientation eliminates re-entrant spectra.
The 77250B uses a smooth knob adjustment to position the grating. A four-digit counter displays the wavelength in nanometers when using a 1200 lines/mm grating. For gratings with different line densities, the wavelength shown on the display is multiplied by the appropriate scaling factor. The readout is set during calibration so that the wavelength indicated is correct to within 1 nm over the full range of a 1200 lines/mm grating. For greater accuracy, the readout can be reset within any restricted spectral region.
Fixed slits should be used for the utmost accuracy and repeatability, especially at high resolution. The slit width is one of the factors determining the resolution and throughput of the instrument, with a narrow slit providing higher resolution and lower throughput. Fixed slits are the best option when only a few slit sizes are required, as they are less expensive. The fixed slits slide into the pre-installed slit holders at the input and output ports. The width and height cannot be adjusted, but may be individually replaced with other slit sizes. Individual fixed slits are required to use the instrument and ordered separately to allow customized choices based on the needs of the application. Order two identical fixed slits for the 77250B monochromator.
Micrometer adjustable slits offer flexibility and high throughput. This type of slit is designed primarily for versatility and convenience in changing resolution and throughput. Micrometer adjustable slits do not provide the same level of accuracy and repeatability of fixed slits. A micrometer adjustable slit assembly is continuously variable from fully closed to 3 mm width. The narrowest practically achievable width is 4 µm. A height adjustment slide allows variation in the height from 2 to 12 mm. Two micrometer slit assemblies are pre-installed at the input and output ports.
The optional
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Mounting Kit, 77250 and 77250B Monochromators, Imperial
Model: 77387
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