The CS260B monochromator is a redesigned and greatly improved instrument over its predecessor. By integrating a Newport motion stage, scan speed is faster, as well as higher wavelength accuracy and precision over the original models. A robust mechanical design and optical mounting configuration has increased rigidity and reproducibility. Communication protocols have been updated, greatly reducing timeout errors and improving overall speed and efficiency.

The CS260B is assembled, pre-aligned, and calibrated at the factory, so it is ready for immediate use. The diffraction gratings are installed on a grating mount and factory aligned. A micrometer slit is pre-installed at the input port and axial output port. Dual port versions include an additional slit assembly on the lateral output port. Included with each instrument are LabVIEW™ based utility software, MonoTerm low-level command software, a user’s manual, and a certificate of calibration. A DC power supply and line cords for the US and Europe are also included.

The optical design of the Cornerstone 260B is based upon an asymmetrical in-plane version of a Czerny-Turner monochromator. Choose a dual or quad grating assembly based on the spectral range of the application. The optical configuration is designed to ensure high resolution and maximum throughput. This F/3.9 monochromator is optimized to provide excellent stray light rejection while minimizing aberrations. A high precision motor and a grating turret assembly are used to select the desired wavelength and switch between diffraction gratings quickly, without sacrificing performance.

Exclusive to the CS260B monochromators, the  may be adjusted from 6 µm to 3 mm width in 6 µm steps. The slit width is controlled through the utility software, optional hand controller, optional TracQ Basic software or by using low level commands. An advantage of using motorized slits is that in addition to setting the individual slit widths remotely, the software can be configured to an automatic bandpass setting. The software adjusts the slit widths to maintain the chosen bandpass as scans are performed using multiple gratings and either output port. Motorized slits are only available on special order configuration Cornerstone 260B monochromators. Contact your Newport sales representative for more information.

Micrometer adjustable slits offer flexibility and high throughput, but are not as accurate or repeatable as fixed slits. The 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. This type of slit is designed primarily for versatility and convenience in changing resolution and throughput.

All models include a connector to utilize the optional  Hand Controller for manual operation without a computer. There is no need to memorize commands or key sequences. The display provides information on the grating selection, active filter selected, current wavelength, shutter status, and more.

The monochromator is capable of automatically controlling the optional model  filter wheel. These filter wheels hold up to six 1-inch diameter filters. Neutral density filters can be used for intensity adjustment. Order sorting filters may be installed to block higher order diffraction. The filter wheel can be mounted to the male flange of the monochromator slit or slit holder. The filters are mounted external to the monochromator.

The monochromator is available with a single output port or dual output ports. A single output port is the most economical choice, and the simplest arrangement when using a single detector. If more than one detector is required for the application, the use of a single output port instrument results in the experiment needing to be stopped to switch detectors. An alternative is to use a beamsplitter after the output port, which results in lower power reaching the two detectors. In this situation, a dual output port monochromator may be a better choice. Two output ports allow continuous scanning over a broad wavelength range without needing to break down the setup to swap detectors. A flip mirror inside the monochromator is used to select the output port. This mirror is controlled through the monochromator software, low level commands or the optional hand controller. Please note that with dual output port instruments, an unused port left uncoupled can become a source of stray light entering into the monochromator.

Oriel's 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.

An electronic shutter is integrated into the monochromator's housing for the many spectroscopic applications that require the use of a shutter.