Fiber Optic Scanning Monochromator

Monochromator Allows 2 nm Bandwidth

The MonoScan2000 is a computer-controlled scanning monochromator with a 300-700 nm wavelength range. It takes the MonoScan2000 only three seconds to scan from 300-700 nm. To scan only one nanometer takes about 15-20 milliseconds. The MonoScan2000 is compatible with all Ocean Optics spectrometers, light sources, accessories and optical fibers.

Use as a Tunable Light Source or Excitation for Fluorescence

In this setup, a broadband light source provides light via optical fiber to the MonoScan2000. You select a 2-to-3 nm bandpass in which the light passes before exiting the MonoScan, interacting with a sample and passing to a spectrometer. In this situation, the MonoScan takes the place of a filter. A scanning monochromator is better able to provide excitation intensity than a filter because of the monochromator’s ability to reject out-of-band illumination. Filters can provide adequate excitation intensity but at reduced optical transmittance because they typically have a wider bandpass. You often sacrifice dynamic range with filters.

Use with Single-element Detector

A light source provides light via optical fiber to a sample, interacts with the sample, and sends light to the MonoScan2000. The monochromator captures the incoming light, transmits it via fiber to a single-element detector, such as a photodiode, one wavelength at a time. The MonoScan2000 allows a high optical throughput and provides an intense spectral signal. The MonoScan has the ability to scan through a wavelength range you select via software. Because the MonoScan has no slit, the diameter size of the optical fiber determines the optical resolution of the system. When using 200 µm fibers, for example, optical resolution is <3 nm (FWHM).

The MonoScan2000 is available for $6170.

Specifications

Dimensions:	112 mm x 132 mm x 145 mm
Weight:	1.1 kg
Wavelength range:	300-700 nm
Optical resolution:	Depends on the diameter of the optical fiber; ~4 nm (FWHM) using a 400 µm diameter optical fiber
Holographic grating:	1250 lines/mm, blazed at 350 nm
Accuracy:	<0.5 nm
Repeatability:	0.2 nm
Transition speed:	From scan from 300 nm to 700 nm takes ~3 seconds A one nanometer step takes ~15-20 milliseconds
Dispersion:	~10 nm per mm
Optical throughput:	>50% with a 1000 µm fiber at 350 nm >30% with a 1000 µm fiber at 500 nm
Grating scan angle:	14.8° (300-700 nm)
Computer interface:	USB and RS-232
Power requirement:	12 VDC max. 1.2A (WT-12V-E)
Gearbox ratio:	1:261