MSA-130 Double Additive/Subtractive Monochromator

The MSA-130 is a compact double monochromator offering enhanced functionality and low stray light performance.

A key feature of the MSA-130 is its ability to operate in both additive and subtractive dispersion modes, offering versatility for various applications.

The operation modes are easily switched using a two-position selector switch, allowing users to switch between the "Addition" and "Subtraction" modes without the need for additional alignment. This makes the MSA-130 a multifunctional, compact, user-friendly, and reliable instrument.

In the Additive Dispersion Mode, the MSA-130 functions as a standard double additive monochromator with an effective focal length of 260 nm. It ensures extremely low stray light, thanks to its intermediate slit.

In the Subtractive Dispersion Mode, the MSA-130 acts as a tunable filter with an adjustable bandpass and sharp edges. The width of the selected spectral range is set by the intermediate slit, while the central wavelength is determined by synchronously rotating two identical diffraction gratings.

In Subtractive Dispersion mode, the beam path in the second half of the monochromator mirrors that of the first half, resulting in complete dispersion compensation and zero dispersion. As a result, the entire spectrum selected by the intermediate slit is imaged as a spatial line at the second monochromator’s output.

The MSA-130 is equipped with a selection of ruled gratings to suit various applications. To ensure optimal dispersion compensation (zero dispersion), both halves of the monochromator are equipped with diffraction gratings made from the same matrix, guaranteeing precise alignment.

The MSA-130 double monochromator offers a wide range of accessories designed for efficient light collection from samples, whether located at a finite distance or at infinity, and provides light input to the monochromator both with and without an optical fiber, ensuring effective aperture matching.

Adapters PS-2 and PS-3 are available for wide-aperture light collection from samples. PS-2 is optimized for high UV transmittance, while PS-3 can be equipped with an Edge filter to enhance flexibility.

Cassegrain lenses are used for light collection from objects situated between 3.5 meters and infinity.

Most Popular Accessories for the MSA-130:

• Achromatic Fiber Adapter (AFA): This adapter includes two achromatic objectives and an SMA-905 connector, designed to match the optical fiber aperture with the MSA-130, minimizing stray light and optimizing light throughput. The AFA operates across a spectral range of 200 nm to 2000 nm.
   
• Vertical Slit Position Support: The MSA-130’s entrance and exit slits are positioned at a 66° angle to the vertical. If a vertical slit position is required, the instrument can be equipped with a special support that adjusts the housing to achieve this configuration. Additionally, a support for horizontal slit positioning is also available upon request.
   

Other Accessories:

• Adapters for optical fiber input 
• Optical fibers 
• Condensers for light input into the monochromator
• Cassegrain lenses