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Goniometric Radiometers
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3.9 Goniometric Radiometers 3.9.1 LD 8900, LD 8900R Far-Field Profilers Profiling divergent light sources presents many challenges, but Photon’s far-field profilers characterize the angular radiation intensity of light simply and accurately in real time. Both the LD 8900 and LD 8900R (wide dynamic range Goniometric Radiometer) provide full 3-dimensional measurements of the far-field pattern in minutes or less, with far better resolution than a CCD camera. The LD 8900 far field profiler provides direct real-time far-field measurements with >24dB dynamic range, while the wide dynamic range LD 8900R has a dynamic range of >36dB, which provides greater detail in the “tails” of the far-field pattern. Both models have an angular sampling resolution of 0.055º and a field-of-view of ±72° (144°), and are ideal for characterizing the light flux from many sources, including VCSELs, laser diodes (LDs), optical fibers, optical waveguides, and more. With the LD 8900R, measurement of the mode field diameter of optical fiber is possible in real time with greater than 5% accuracy. The LD 8900 and the LD 8900R are available with either a silicon or InGaAs detector and have a standard entrance aperture of 2mm, with an optional 10mm entrance aperture for use with larger sources such as LEDs and LD bars. LD 8900 and LD 8900R complete systems include: The Scan Unit The Motion Control Module Goniometric Radiometer Acquisition and Analysis Software for Microsoft Windows operating systems PCI Interface Box Power and instrument cables An optional semi-custom source mount, specifically designed to meet your application needs, can be quoted upon request for either the LD 8900 or the LD 8900R Mode Field Diameter in Real Time with LD 8900R The LD 8900R allows for real-time measurements of Mode Field Diameter (MFD) with an accuracy of ±5%* for a nominal 10µm single-mode fiber. Mode Field Diameter (MFD) of single-mode optical fiber is measured using the methodology described in the Telecommunication Industry Association/ Electronic Industries Association (TIA/EIA) Standard FOTP-191. Specifically, the MFD is calculated using the Petermann II integral, with data sampled at angular resolution of 0.055° and collected over an angular extent of ±72° (144° viewing angle). *If greater accuracy is required, Photon’s LD 8900HDR is specifically designed to measure MFD and Aeff to greater than 0.5% Polar View (left); 3D View (top); Beam Statistics (bottom) with LD 8900R Windows Showing uniformity of a Laser Diode Laser Diode Diffraction Rings For latest updates please visit our websit

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Communications Electrical/Mechanical AC Power Required Main supply voltage fluctuations: Dimensions mm Scanning Unit Scanner Motion Controller Environmental Conditions 84mm 1000µm (options available) 2mm standard (optional 1cm) ±72° (144 degrees) 1, 2, 10, 20, 50, 100, or 200 0.055 degrees, 3241points/scan 320-1100nm 800-1700nm 190-~1100nm 900 W/cm² 1 J/cm² 10’s of µW to 10’s of W* 1µW to 1W** Contact Factory Contact Factory CW or Pulsed (rep rates >10kHz) FWHM, 5%, 13.5%, 2 user-specified clip levels FWHM, 5%, 13.5%, 2 user-specified clip levels FWHM, 5%, 13.5%, 2 user-specified clip...

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3.9.1.2 Ordering Information - Goniometric Radiometer Far-Field Profilers All Goniometric Radiometer LD 8900 Far-Field Profiler Systems include the Scan Unit, PCI Controller Interface, software for windows 7 (32/64) including ActiveX Automation commands. Tower/desktop computers with available PCI slot, it is not compatible with laptop. All LD 8900R systems include the above as well as a dynamic range >36dB with 0dB source. System incorporates 16-bit digitizer, light scatter control and special amplifiers to achieve higher dynamic range than standard LD8900. For pulsed operation, please...

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