USB4000 Optical bench Options

What makes the USB4000 Spectrometer so special are the options that allow you to configure the bench for your application. Our Applications Scientists can help you choose the optimum components, or you can follow this guide to choose an entrance aperture size, detector accessories, filters, a grating and more. The diagram below shows how light moves through the asymmetrical crossed Czerny-Turner optical bench, which has no moving parts that can wear or break; all components specified are fixed in place at the time of manufacture.

Components of the USB4000 Optical Bench

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SMA905 Connector Light from a fiber enters the optical bench through the SMA905 Connector. TheSMA905 bulkhead provides a precise locus for the end of the optical fiber, fixed slit, absorbance filter and fiber clad mode aperture. 4 2
Fixed Entrance Slit:specify slit size Light passes through the installed slit, which acts as the entrance aperture. Slitscome in various widths from 5 µm to 200 µm. The slit is fixed in the SMA905 bulkhead to sit against the end of a fiber. 8 6 7 9 3
Longpass Absorbing Filter:optional If selected, an absorbance filter is installed between the slit and the clad modeaperture in the SMA905 bulkhead. The filter is used to block second- and third- order effects or to balance color. 10 5 3 2 4
Collimating Mirror: specify standard or SAG+ The collimating mirror is matched to the 0.22 numerical aperture of our opticalfiber. Light reflects from this mirror, as a collimated beam, toward the grating. You can opt to install a standard mirror or a UV absorbing SAG+ mirror. 1 5
Grating & Wavelength Range:specify grating & starting wavelength 8
Detector Spectrometers We install the grating on a platform that we then rotate to select the startingwavelength you’ve specified. Then we permanently fix the grating in place to eliminate mechanical shifts or drift. We offer a 3648-element Toshiba TCD1304APlinear CCD array detector. Each pixel responds to the wavelength of lightthat strikes it. Electronics bring the complete spectrum to thesoftware. 6
Focusing Mirror: specify standard or SAG+ This mirror focuses first-order spectra on the detector plane. Both the collimatingand focusing mirrors are made in-house to guarantee the highest reflectance and the lowest stray light possible. You can opt to install a standard or SAG+ mirror. 9
OFLV Variable Longpass Order-sorting Filter:optional Our proprietary filters precisely block second- and third-orderlight from reaching specific detector elements. 7
L4 Detector Collection Lens:optional 10
UV4 Detector Upgrade:optional This cylindrical lens, made in-house to ensure aberration-free performance, isfixed to the detector to focus the light from the tall slit onto the shorter detector elements. It increases light-collection efficiency. When selected, the detector’s standard BK7 window isreplaced with a quartz window to enhance the performanceof the spectrometer for applications <340 nm.

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SMA 905 Connector

A precision SMA 905 Connector aligns to the spectrometer’s entrance slit and ensures concentricity of the fiber.For an upgrade fee that includes the cost of the custom connector and labor, we will replace the standardSMA 905 Connector with a different connector of your choice. We also offer connector adapters, such as anSMA-to-ST Adapter and an SMA-to-FC Adapter. Please call for details on connectors and adapters.

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Fixed Entrance Slit

Another option available with a USB4000 user-configured spectrometer is the size of the entrance aperture. Entrance slits are rectangular apertures, 1-mm tall and various widths from 5 µm to 200 µm, with the widthdetermining the amount of light entering the bench. A slit is permanent; it only can be changed by ourtechnicians. You can opt against having a slit, in which case the diameter of the fiber connected to the spectrometer determines the size of the entrance aperture.

SlitDescriptionPixel ResolutionPrice
SLIT-55-µm wide x 1-mm high~5.3 pixels$150SLIT-1010-µm wide x 1-mm high~5.7 pixels$150 SLIT-2525-µm wide x 1-mm high~7.5 pixels$150 SLIT-5050-µm wide x 1-mm high~11.6 pixels$150SLIT-100100-µm wide x 1-mm high~21 pixels$150 SLIT-200200-µm wide x 1-mm high~42 pixels$150 Aslit isinstalledon the insideedge of thebulkhead of anSMA905 Connector. Tel:727.733.2447 • Email:Info@OceanOptics.com15

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