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Home > Product Details > USB4000 Optical Bench Options

USB4000 Optical Bench Options

USB4000 Optical Bench Options 1 2 3 4 5 6 7 8 9 10

Hover over the numbers on the image for more info.

SMA 905 Connector
Light from a fiber enters the optical bench.

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Fixed Entrance Slit
Use our Range and Resolution Calculator to find out how your slit choice affects optical resolution.

Click now for more detailed information.

Longpass Absorbing Filter
A filter has a transmission band and a blocking band to restrict radiation to a certain wavelength region for eliminating second- and third-order effects.

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Collimating Mirror
Light reflects from this mirror, as a collimated beam, toward the grating.

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Grating & Wavelength Range
Gratings are fixed place at the time of spectrometer assembly. Dispersion will depend on your choice of starting wavelength.

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Focusing Mirror
This mirror focuses first-order spectra on the detector plane.

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L4 Detector Collection Lens
This cylindrical lens focuses the light from the tall slit onto the shorter detector elements.

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Detector
We offer a 3648-element linear CCD array Toshiba detector.

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OFLV Variable Longpass Order-sorting Filter
Precisely blocks second- and third-order light from reaching specific detector elements.

Click now for more detailed information.

UV4 Detector Window Upgrade
Standard window is replaced with a quartz window for applications <340 nm.

Click now for more detailed information.

Light from a fiber enters the optical bench through the SMA 905 Connector. The SMA 905 bulkhead provides a precise location for the end of the optical fiber, fixed slit, absorbing filter and fiber clad mode aperture.

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Slit Piece

Light passes through the installed slit, which acts as the entrance aperture. Slits come in various widths from 5 µm to 200 µm. The slit is fixed in the SMA 905 bulkhead to sit against the end of a fiber. Smaller slit sizes achieve the best optical resolution.

Slit Description Pixel Resolution
SLIT-5 5-µm wide x 1-mm high ~5.3 pixels
SLIT-10 10-µm wide x 1-mm high ~5.7 pixels
SLIT-25 25-µm wide x 1-mm high ~7.5 pixels
SLIT-50 50-µm wide x 1-mm high ~11.6 pixels
SLIT-100 100-µm wide x 1-mm high ~21 pixels
SLIT-200 200-µm wide x 1-mm high ~42 pixels

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Longpass Absorbing FilterWhen selected, an absorbing filter is installed between the slit and the clad mode aperture in the SMA 905 bulkhead. The filter is used to limit bandwidth of light entering spectrometer or to balance color. Filters are installed permanently.

Item Description
OF1-WG305 Longpass filter; transmits light >305 nm
OF1-GG375 Longpass filter; transmits light >375 nm
OF1-GG395 Longpass filter; transmits light >395 nm
OF1-GG475 Longpass filter; transmits light >475 nm
OF1-OG515 Longpass filter; transmits light >515 nm
OF1-OG550 Longpass filter; transmits light >550 nm
OF1-OG590 Longpass filter: transmits light >590 nm

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The collimating mirror is matched to the 0.22 numerical aperture of our optical fiber. 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.

SAG+ mirrors are often specified for fluorescence. These mirrors also absorb nearly all UV light, which reduces the effects of excitation scattering in fluorescence measurements. Unlike typical silver-coated mirrors, the SAG+ mirrors won’t oxidize. They have excellent reflectivity — more than 95% across the Vis -NIR.

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Gratings

We install the grating on a platform that we then rotate to select the starting wavelength you have specified. Then we permanently fix the grating in place to eliminate mechanical shifts or drift.

Click here for your Grating & Wavelength Choices.

Predicted Ranges & Resolutions

See a series of graphs to demonstrate the predicted Range and Resolution of your USB4000 Spectrometer.

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This mirror focuses first-order spectra on the detector plane. Both the collimating and 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.

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Detector Collection LensThis cylindrical lens, made in-house to ensure aberration-free performance, is fixed to the detector to focus the light from the tall slit onto the shorter detector elements. It increases light-collection efficiency and reduces stray light. It also is useful in a configuration with a large-diameter fiber for low light-level applications.

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We offer a 3648-element (Toshiba TCD1304AP) linear CCD array detector with an effective range of 200-1100 nm. Each pixel responds to the wavelength of light that strikes it. Electronics bring the complete spectrum to the software.

 

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Our proprietary filters precisely block second- and third-order light from reaching specific detector elements.

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When selected, the detector’s standard BK7 window is replaced with a quartz window to enhance the performance of the spectrometer for applications <340 nm.

Detector Description Spectrometer
DET4-200-850 Toshiba TCD1304AP detector, installed, with 200-850 nm variable longpass filter and UV4 quartz window; best for UV-VIS systems configured with grating #1 or #2 USB4000
DET4-200-1100 Toshiba TCD1304AP detector; installed, with 200-850 nm variable longpass filter and UV4 quartz window; best for systems configured with XR-1 grating USB4000
DET4-350-1000 Toshiba TCD1304AP detector; installed, with 350-1000 nm variable longpass filter; best for VIS systems configured with grating #2 or #3 USB4000
DET4-UV Toshiba TCD1304AP detector, installed, with UV4 quartz window; best for systems <360nm USB4000
DET4-VIS Toshiba TCD1304AP detector, installed, with VIS BK7 window; best for systems configured for >400nm USB4000

Detector Specifications

Specification Toshiba Detector
Detector: Toshiba TCD1304AP Linear CCD array
Detector range: 200-1100 nm
Pixels: 3648 pixels
Pixel size: 8 μm x 200 μm
Pixel well depth: 100,000 electrons
Signal-to-noise ratio: 300:1 (at full signal)
Dark noise: 50 RMS counts
Corrected linearity: >99.8%
Sensitivity: 130 photons/count at 400 nm; 60 photons/count at 600 nm

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