77250B 1/8 m Hand Operated Monochromator
77250B 1/8 m Hand Operated Monochromator
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.
- Economical, fully assembled, pre-aligned monochromator
- Ebert-Fastie design eliminates stray light
- Manually operated smooth adjust knob sets wavelength output accurate to 1 nm
- Integrated with a four-digit counter, with 0.1 nm resolution adjustment
- Fixed slit and micrometer adjustable slit models available
- Selectable wavelength ranges available with interchangeable gratings See All Features
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
 | 77250 77250B 1/8 m Hand Operated Monochromator1/8 m Monochromator, Hand Operated | Discontinued | ||||
| 77250-FH 77250B 1/8 m Hand Operated Monochromator1/8 m Monochromator, Hand Operated, Fixed Slit Assembly | Discontinued | ||||
 | 77250-MC 77250B 1/8 m Hand Operated Monochromator1/8 m Monochromator, Hand Operated, Micrometer Driven Slit Assembly | Discontinued | ||||
 | 77250B-FH 77250B 1/8 m Hand Operated Monochromator1/8 m Monochromator, Hand Operated, Fixed Slit Assembly | |||||
 | 77250B-MC 77250B 1/8 m Hand Operated Monochromator1/8 m Monochromator, Hand Operated, Micrometer Driven Slit Assembly | |||||
Features
Interchangeable Diffraction Gratings
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.
Optical Design
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.
Manual Wavelength Drive and Readout
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 Slit Version Option
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 Slit Option
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.
Delivered Fully Assembled and Aligned
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.
Monochromator Mounting
The optional 77387 mounting plate can be used to secure a 77250B monochromator to an imperial optical table. The ability to mount the monochromator simplifies setup and alignment of the optical system. The mounting plate also helps ensure consistent results over time, as the monochromator cannot be accidentally moved out of position. The plate adds 0.25 inch [6.35 mm] to the optical height. Threaded holes on the mounting surface of the monochromator also allow the instrument to be optical rod mounted, if desired.
Sensor Integration
Oriel's family of photodiode sensors come with a standard 1.5-inch series flange, allowing instant light-tight connectivity to our monochromators. These sensors are operated in the photovoltaic (unbiased) mode to provide the lowest noise for DC and low frequency operation since it avoids the shot noise associated with bias currents. We offer amplified and unamplified versions with large active areas to make signal capture easy. Additional options include NIST traceable calibrated models and Thermoelectric (TE) cooled options.
Accessories
Fixed Slits
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
 | 77211 Fixed Slit, 6.32 mm Width, 18 mm Height | |||||
 | 77212 Fixed Slit, 3.16 mm Width, 18 mm Height | |||||
 | 77213 Fixed Slit, 1.56 mm Width, 18 mm Height | |||||
 | 77214 Fixed Slit, 1240 µm Width, 18 mm Height | |||||
 | 77215 Fixed Slit, 760 µm Width, 18 mm Height | |||||
 | 77216 Fixed Slit, 600 µm Width, 18 mm Height | |||||
 | 77217 Fixed Slit, 280 µm Width, 18 mm Height | |||||
 | 77218 Fixed Slit, 120 µm Width, 18 mm Height | |||||
 | 77219 Fixed Slit, 50 µm Width, 6 mm Height | |||||
 | 77221 Fixed Slit, 50 µm Width, 3 mm Height | |||||
 | 77728 Fixed Slit, 100 μm Width, 3 mm Height | |||||
 | 77730 Fixed Slit, 200 μm Width, 3 mm Height |
Diffraction Gratings
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
 | 77296 77250 Monochromator Grating, Holographic, 1200 l/mm, 240 nm blaze, 200-600 nm | |||||
 | 77298 77250 Monochromator Grating, Ruled, 1200 l/mm, 360 nm blaze, 200-1000 nm | |||||
| 77299 77250 Monochromator Grating, Ruled, 600 l/mm, 1000 nm blaze, 650-2000 nm | |||||
| 77300 77250 Monochromator Grating, Ruled, 300 l/mm, 1700 nm blaze, 1100-2400 nm | |||||
| 77301 77250 Monochromator Grating, Ruled, 150 l/mm, 4000 nm blaze, 2500-8000 nm | |||||
| 77302 77250 Monochromator Grating, Ruled, 75 l/mm, 8 um blaze, 4.5-20 um | |||||
| 77303 77250 Monochromator Grating, Ruled, 50 l/mm, 12 um blaze, 7-23 um | |||||
| 77304 77250 Monochromator Grating, Ruled, 600 l/mm, 225 nm blaze, 200-400 nm | |||||
| 77305 77250 Monochromator Grating, Ruled, 600 l/mm, 700 nm blaze, 450-2000 nm | |||||
| 77306 77250 Monochromator Grating, Ruled, 1200 l/mm, 750 nm blaze, 475-1000 nm | |||||
| 77308 77250 Monochromator Grating, Ruled, 2400 l/mm, 275 nm blaze, 200-500 nm | |||||
| 77309 77250 Monochromator Grating, Holographic, 1800 l/mm, 560 nm blaze, 320-670 nm | |||||
| 77310 77250 Monochromator Grating, Holographic, 3600 l/mm, 300 nm blaze, 250-330 nm | |||||
| 77317 77250 Monochromator Grating, Ruled, 150 l/mm, 800 nm blaze, 425-1600 nm |
Optional Accessories
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
 | 7124 Filter Adapter, 1 inch Filter for 71260 Holder | |||||
 | 71260 Optical Filter Holder, Quick Change, 1.75 - 2 in., 1.6 in. Clear Aperture | |||||
 | 77387 Mounting Kit, 77250 and 77250B Monochromators, Imperial | |||||
 | OAP-ADAPT Parabolic Mirror Adapter, 1.5 in. Series Flange | |||||
 | RF-ADAPT Optical Fiber Adapter, Monochromator, Rectangular Fiber Bundle | |||||
 | USFW-100 Universal Filter Wheel, Flange Mount, Motorized |
Resources
Literature
77250B Monochromator Datasheet.pdf(2 MB, PDF)
