The Ophir Wide Beam Imager accessory provides a way to measure both size and power distribution of a divergent or large diameter beam coming from sources such as LED, VCSEL as well as large diameter parallel beams.
10 to 45 mm beam sizes
350-1100 nm and 900-1700 nm wavelength ranges
Measure size and power distribution of large diameter beams
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wide-laser-beam-imager - Drawings
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Specifications
Beam Size
10 to 45 mm
Active Area
Ø45 mm
Angle of Incidence
<70 degrees
Features
Introducing the Wide Beam Imager
The Ophir Wide Beam Imager accessory is a compact, calibrated optical system for measuring the size and power distribution of large and divergent beams of VCSELs, LEDs, edge-emitting lasers, and fiber lasers. It employs a 45 mm diffusive plate onto which the beam from the light source is projected. This image is then reduced by 8 times and is reimaged onto the camera focal plane. VCSELs, LEDs and fiber lasers are used in many sensitive applications. To guarantee the high quality of the devices, it is essential to analyze the beam profile, but those wide, divergent beams place specific requirements on the measurement system:
The apertures of conventional beam profilers are too small to collect the entire spot of large or divergent light sources.
Diverging beams cannot be accurately measured with regular detectors because the quantum efficiency of the detector is highly dependent on the angle of incidence. Compact, ruggedized, and portable design of WB-I enables on-site service of beam profiling of VCSELs and LED systems at the customer site as well as operation at production lines and R&D labs.
Divergent beams measurement significantly improved due to the possibility of up to 70° angle measurement, compared to 15°of standard beam profiler sensors.
WB-I accessory, together with the camera and the BeamGage software, provides real-time beam shape analysis. Visualization of changes of the beam shape due to different currents can be easily detected.
Variable attenuation, via a set of interchangeable filters or iris, enables measuring wide range of light sources of different emitting powers.
Designated for R&D, Production and Service in following fields: Data Telecommunication, Automotive, Remote sensing, Face and gesture recognition
Typical measurements: Far Field energy distribution, divergent, LIV sweep test VCSELs (beam profile vs current (A))
The WB-I SWIR is designated to operate without any ND filters on InGaAs camera. The attenuation is performed via Iris control wheel, which attenuates by up to 100 (ND2). The addition of any filters will disrupt magnification. In case additional attenuation is required, LBS-400 beam splitter is recommended.
According to the light source and beam geometry, customer will choose the measurement parameters which will yield most suitable results for the application, e.g. D4σ is the best for gaussian fit at M2 = 1.50% of Peak value (FWHM) for "Tophat". For repeatable and reproducible results, use the UltraCal and Aperture features. For divergence angle measurements, distance from source to imaging screen should be measured. Screen is 0.5 mm inside the support tube end surface. The Divergence Angle measurements can be enabled in the Results area of the BeamGage application: In BeamGage, go to "Computation" > Divergence >Far Field Wide Angle settings to set distance from source to WB-I screen.
System absorbs 20% of the power, the other 80% is back diffused from the WB-I. 200 W is acceptable in continuous mode. Higher power depends on environmental conditions and time of use.
The WB-I is optically aligned and calibrated for use with of any combination of 2 Ophir ND1 or ND3 filters. Other filters have a different thickness and use of them will affect the measurement accuracy
According to the light source and beam geometry, customer will choose the measurement parameters which will yield most suitable results for the application, e.g. D4σ is the best for gaussian fit at M2 = 1, 50% of Peak value (FWHM) for "Tophat". For repeatable and reproducible results, use the UltraCal and Aperture features. For divergence angle measurements, distance from source to imaging screen should be measured. Screen is 0.5mm inside support tube end surface. The Divergence Angle measurements can be enabled in the Results area of the BeamGage application: In BeamGage, go to "Computation" > Divergence >Far Field Wide Angle settings to set distance from source to WB-I VIS screen.
The WB-I SWIR is designated to operate without any ND filters on InGaAs camera. The attenuation is performed via Iris control wheel, which attenuates by up to 100 (ND2). The addition of any filters will disrupt magnification. In case additional attenuation is required, LBS-400 beam splitter is recommended.
According to the light source and beam geometry, customer will choose the measurement parameters which will yield most suitable results for the application, e.g. D4σ is the best for gaussian fit at M2 = 1.50% of Peak value (FWHM) for "Tophat". For repeatable and reproducible results, use the UltraCal and Aperture features. For divergence angle measurements, distance from source to imaging screen should be measured. Screen is 0.5 mm inside the support tube end surface. The Divergence Angle measurements can be enabled in the Results area of the BeamGage application: In BeamGage, go to "Computation" > Divergence >Far Field Wide Angle settings to set distance from source to WB-I screen.
System absorbs 20% of the power, the other 80% is back diffused from the WB-I. 200 W is acceptable in continuous mode. Higher power depends on environmental conditions and time of use.
The WB-I is optically aligned and calibrated for use with of any combination of 2 Ophir ND1 or ND3 filters. Other filters have a different thickness and use of them will affect the measurement accuracy
According to the light source and beam geometry, customer will choose the measurement parameters which will yield most suitable results for the application, e.g. D4σ is the best for gaussian fit at M2 = 1, 50% of Peak value (FWHM) for "Tophat". For repeatable and reproducible results, use the UltraCal and Aperture features. For divergence angle measurements, distance from source to imaging screen should be measured. Screen is 0.5mm inside support tube end surface. The Divergence Angle measurements can be enabled in the Results area of the BeamGage application: In BeamGage, go to "Computation" > Divergence >Far Field Wide Angle settings to set distance from source to WB-I VIS screen.
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