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 The patented SBSI is a small beam lateral shear interferometer that uses an air gap between glass plates to shear the beam and then projects a magnified interference fringe pattern on a camera or fluorescent viewing screen. Optical aberrations can be identified and corrected while viewing the SBSI fringe pattern in real-time. For example, coma can be corrected by changing the tilt of a collimating lens in an optical system so the fringes on the SBSI change from curved to straight. A reference line on the SBSI screen indicates the best focus (collimation) angle for the fringes. When the fringes are parallel to the SBSI reference line, all optical aberrations are minimized. Beams can be checked directly or in reflection using a rotating beam-splitter cube mounted on the front of the SBSI.
Focus alignment sensitivity is approximately 130 micro radians of beam divergence, corresponding to 3° rotation of the fringes for 3½ fringes. Each SBSI is optimized for 3½
fringes for a specific wavelength and beam diameter, but every SBSI can be used to check beams over a certain
range of wavelengths and diameters.
Please inquire about special SBSI designs that are optimized for your application.
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Download White Paper - 251 KB
Applications
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Wavefront and collimation testing
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Test laser diodes at wavelengths from below 200nm to 1700nm.
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Test beams from 1-8mm diameter, or smaller with beam expander
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Alignment and collimation of fiber optic systems
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Optical alignment of holographic storage & disk mastering systems
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OEM integration for real-time monitoring of laser collimation
Main Features & Benefits
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Measure collimation to better than 100-200 micro radians (wavelength dependent)
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Wavelengths from 180-1700nm
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Small beam probe allows measurement between optical components.
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Simple operation reduces alignment time to minutes
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Three models to choose from including fluorescent screen, camera, and 8x zoom systems.
Intellium™ SBSI Shearing Interferometer Specifications
*Wavelength Coverage |
SBSI-1A |
180 to 670nm |
SBSI-1B |
340 to 1064nm |
SBSI-1B-NIR5 |
1550nm |
SBSI-1B-NIR7 |
1700nm |
SBSI-1B-UV |
Below 200nm to 340nm |
Beam Diameter Coverage |
Diameter |
1mm to 8mm (or smaller with a beam expander) |
Option |
Zoom 1x – 8x |
Each instrument is custom built for a specific wavelength and beam diameter.
Sensitivity and magnification will be maximized at these values. |
** Sensitivity |
50 to 350 μrad (wavelength & beam size dependent) |
Size |
Main module |
67mm (2.625")H x 64mm (2.5")W x 51mm (2")D |
Fluorescent screen tube |
*** add from 25mm (1”) to 127mm (5”) H |
camera tube module |
*** add from 38mm (1.5”) to 127mm (5”) H |
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Weight |
1 kg (2.25 lbs) |
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Camera |
752x582 pixels |
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Monitor |
CCIR/EIA 5.6” TFT display |
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SBSI-1A |
This model uses a fluorescent diffuse screen for 180nm in the UV through the visible region.
This unit is very portable, as it requires no power. |
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SBSI-1B |
This model projects the sheared interferograms onto an integrated camera for wavelengths 340nm to
1064nm [1700nm optional] (viewable with the 5.6” LCD display). A battery pack is provided making
the system completely portable. |
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SBSI-1B-NIR5/7 & SBSI-1B-UV |
These models are the same as the SBSI-1B except the camera has a phosphor coating to enhance
the working wavelength to the specified NIR or UV wavelength. Light sensitivity allows use down to
one (1) mw beams. |
* SBSI 1A is used from 180nm through the visible. SBSI 1B is used from 340nm to 1064nm.
Below 340nm requires SBSI-1A or SBSI-1B-UV. NIR wavelengths require SBSI-1B-NIR.
** When ordering, an optimum wavelength and beam diameter must be specified.
Sensitivity and magnification will be maximized at these values.
*** Depends on magnification required. NIR and UV versions also have sensitivity in the visible.
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