Varioilluminator (subtractive double monochromator with variable bandpass).

Area of Science:

• Optics and Photonics
• Spectroscopy Instrumentation

Background:

• Traditional monochromators often have fixed bandpass limitations.
• Achieving variable and precisely controlled spectral filtering can be challenging.

Purpose of the Study:

• To introduce a novel double monochromator design, the varioilluminator.
• To demonstrate a method for achieving independently selectable wavelength cutoffs.
• To enable a wide range of tunable bandpasses for spectral applications.

Main Methods:

• The varioilluminator utilizes subtractive dispersion in its second stage.
• A wide, independently adjustable central slit allows for bandpass control.
• The instrument can incorporate either quartz or glass prisms.

Main Results:

• The wavelength bandpass is primarily determined by the central slit width.
• Independent adjustment of the central slit jaws allows precise selection of long and short wavelength cutoffs.
• Bandpasses ranging from approximately 15 Angstroms to several hundred Angstroms are achievable.

Conclusions:

• The varioilluminator provides a flexible and tunable spectral filtering solution.
• Independent control over wavelength cutoffs enhances its utility in various spectroscopic applications.
• This design offers a significant advancement in variable bandpass monochromator technology.