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Instrumentation

Precision Wavelength Selectivity

Monochromators and Tunable Light Sources

Monochromators

Mini-Chrom monochromators are a family of compact, in-line Fastie-Ebert monochromators with a 74mm focal length, ideally suited for general spectroscopy use as well as OEM system integration.

With over 30,000 sold, the Optometrics Mini-Chrom has been a proven workhorse for reliable precision, and superior service life when integrated within sophisticated analytical and biomedical instrumentation such as clinical chemistry analyzers, HPLC detectors, industrial process analyzers, UV-VIS-NIR spectrophotometers and when used within laboratory research applications.

Tunable Light Source

A Tunable Light Source or TLS is used to maximize throughput in the visible region of the spectrum to study wavelength dependent chemical, biological, and physical changes or properties. It can also be used in color analysis and reflectivity measurements of products for aesthetic purposes. The TLS is great for laboratory use and can be customized for many OEM applications.

The Omega Optical TLS is a convenient and affordable integrated system consisting of a Mini-Chrom monochromator and an efficient, power stabilized broadband Tungsten Halogen light source with a variable aperture. The versatile design allows for the selection of manual or computer controlled versions, a spectral range from 360 – 1000 nm, a customizable bandwidth*, as well as fiber optic input adapters for the output.

Instrumentation by Omega Optical

Types of Instrumentation

Digital Mini-Chrom Monochromator

Digital Mini-Chrom Monochromator

The Digital Mini-Chrom Monochromator (DMC) is a manually operated monochromator that utilizes a digital counter for wavelength selection. Rotation of the dial causes, via a precision lead screw/ sine bar mechanism, rotation of the diffraction grating which positions the selected wavelength at the exit slit.

Scanning Digital Mini-Chrom Monochromator

Scanning Digital Mini-Chrom Monochromator

The Scanning Digital Mini-Chrom Monochromator (SDMC) includes an integral stepping motor which can be controlled by a calibrated drive via a 15-pin connector. The SDMC is similar to the Digital Mini-Chrom in that it includes a four digit counter for visual wavelength readout and a dial for manual wavelength selection.

Scanning Mini-Chrom monochromator

Scanning Mini-Chrom Monochromator

The Scanning Mini-Chrom Monochromator (SMC) is designed to be driven by stepping or servo controlled motors. No direct visual wavelength readout is provided. All models utilize a precision lead screw/sine bar mechanism to rotate the diffraction grating which sequentially positions the selected wavelength(s) at the exit slit.

Standard Monochromator

Standard Mini-Chrom Monochromator

The Standard Mini-Chrom Monochromator is a manual unit which utilizes a micrometer for wavelength selection and readout. Turning the micrometer causes, via a precision sine bar drive, rotation of the diffraction grating which positions the desired wavelength at the exit slit.

Tungsten-Halogen-Light-Source

Tungsten Halogen Light Source

The tungsten halogen light source includes a 20W tungsten halogen lamp in a quartz envelope, a lamp housing, shutter assembly and variable aperture assembly on a base plate and a regulated 12V DC power supply. The source can be used as a visible and near infrared source (340 nm to 3 μ) or as a building block to construct a variety of spectrophotometric systems. The addition of a Mini-Chrom Monochromator converts the Tungsten Source to a compact and versatile monochromatic light source.

Monochromator Slits

Monochromator Accessories

Omega Optical offers a range of monochromator accessories to go with their line of best selling Mini-Chrom Monochromators, including: Slit Sets, Aperture Adapters, Calibration Filters, and Blocking Filters.

Manual Tunable Light Source-TLS

Manual Tunable Light Source (TLS)

Omega Optical's Manual Tunable Light Source is a convenient and affordable integration of the Mini-Chrom monochromator, and an stabilized broadband Tungsten Halogen light source with a variable aperture/shutter. The lamp used in the TLS has usable spectral energy between 360 nm and 2000 nm. However, no one grating can give adequate performance over this range. We offer versions optimized for the visible spectrum 360 nm to 800 nm and others for NIR. If our standard Manual TLS (Tunable Light Source) configuration does not suit your application-specific needs, we can put together a custom TLS system that better suits your specific requirements. We can configure a system utilizing any of our standard monochromator models or we can work with you to design a model to cover a specific wavelength range.

Monochromator Slits

Monochromator & TLS Accessories

Omega Optical offers a range of monochromator accessories to go with their line of best selling Mini-Chrom Monochromators, including: Slit Sets, Aperture Adapters, Calibration Filters, and Blocking Filters.

Mini-chrom comparison chart

Throughput, resolution, stray light and power handling are comparable to many larger, more expensive ones. The Mini-Chrom is specifically designed to minimize astigmatic aberrations, enhancing instrument resolution. Each unit includes a set of fixed slits which can be easily changed to wider or narrower slits to optimize throughput or resolution for a particular application.

A variety of monochromator accessories are available that will increase the versatility of the Mini-Chrom in a laboratory environment, including a stepping motor controller and tungsten halogen lamp module with power supply.

Comparing Grating Monochromator Models

Learn about Mini-chrom & TLS Accessories

Slit Sets

Interchangeable Slit Sets

Monochromator Slit SetsA 300 micron pair of slits are included with each Mini-Chrom. Additional slit sets can be purchased to optimize resolution or throughput. Slits are available in 50, 100, 150, 300, 600 and 1000 micron widths, all 4 mm in height.

Changing the slit assemblies in any Mini-Chrom takes only a few seconds and no tools. The slit assembly consists of a precision slit photo etched in a black oxide coated brass disc, a slit spacer, slit cover and two banana plugs. The banana plugs allow the assembly to be easily inserted or removed while assuring alignment of the slit with the monochromator.

Note: Slits should always be changed in pairs.

Aperture Adapters

Aperture Adapters

The Aperture Adapter converts the entrance and/or exit slit ports to accept SMA 905 compatible optical fiber assemblies.

Monochromator Aperture Adapter, Monochromator to SMA
Monochromator Aperture Adapter, Monochromator to SMA

Calibration Filters

Holmium Oxide Calibration Filter

Comprised of 2.5 mm thick holmium oxide filter glass mounted in a metal holder. A spectral scan showing calibration wavelengths from 350 nm to 800 nm is included. A comparison between the reference scan and the indicated wavelength takes only a few seconds.

Blocking Filters

Higher Order Blocking Filters

Required to block higher order (λ/2, λ/3, λ/4, etc.) radiation. Higher order blocking filters are Omega Optical Long Pass Cut-On filters mounted in a ring./product-category/optical-filters/longpass-filters/

Blocking filters need to be matched to your specific monochromator. For assistance choosing the correct filter, please contact us to order the correct model for your Mini-Chrom Monochromator and application.

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