LD 8900, LD 8900R Goniometric Radiometer

Mode Field Diameter

 

Characterize divergent light sources
Measure

  • Laser Diodes on wafer, chip or package
  • VCSELs
  • Single- and multi-mode fiber
  • Scatter pattern of a transmitting diffuser
  • Optical Waveguides
  • Pigtailed light sources
Description
Specifications
Ordering Info
Catalog/Manual
Download Data Sheet.
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 Unifomity of a Laser Diode
Topographical View - LD 8900R Laser Diode Diffraction Rings
LD 8900/LD 8900R System Specifications
Sensor/Detector
Scan Radius 84mm
Pinhole Size 1000μm (options available)
Entrance Aperture 2mm standard (optional 1cm)
Field of View ±72° (144 degrees)
Azimuthal Scans 1, 2, 10, 20, 50, 100, or 200
Spatial Sampling Resolution 0.055 degrees, 3241points/scan
Spectral Range
Silicon detector 320-1100nm
InGaAs detector 800-1700nm
Optional UV 190-~1100nm
Source Input Power for >400nm
Mirror Damage Threshold CW 900 W/cm²
Mirror Damage Threshold Pulsed 1 J/cm²
LDs, multi-mode fiber w/ NA >0.5 10's of μW to 10's of W*
Single-mode fiber 1μW to 1W**
For wavelengths <400nm Contact Factory
Higher power options available Contact Factory
Source Output CW or Pulsed (rep rates >10kHz)
Parameters Measured
Angular Widths FWHM, 5%, 13.5%, 2 user-specified clip levels
Numerical Apertures FWHM, 5%, 13.5%, 2 user-specified clip levels
Angular Width Ratios FWHM, 5%, 13.5%, 2 user-specified clip levels
Angular Position Centroid, Peak
Intensity or Amplitude Centroid, Peak, 2 user-specified locations
Mode-Field Diameter LD 8900R only
Relative Integrated Power Relative Power in user-specified cone angles about an arbitrary axis
Data Update Rates
Single scan updates: ~ 5Hz
Perpendicular Scan updates ~ 0.5Hz
3D Profile Acquisition Time* * Times are PC dependent
10 azimuthal scans ~7s
20 azimuthal scans ~14s
50 azimuthal scans ~35s
100 azimuthal scans ~70s
200 azimuthal scans ~140s
File Saving and Data Logging
  Program Data and Setup Configuration Files
  ASCII file Profiles and Summary Parameters
  Raw 3D Scan Data in binary format
  Screen Captures: BMP, JPG, GIF, TIFF, PNG
  Log to Files and COM Ports
Communications
  RS-232 Serial COM port required
ActiveX Automation
Electrical/Mechanical
AC Power Required 110V ~ 60Hz standard, 220V ~ 50Hz optional (Installation Category: Class II)
Main supply voltage fluctuations: Not to exceed ±10% of the nominal voltage; Transient overvoltage according to Installation Category II; Pollution Degree 1 or 2 in accordance with IEC 664.
Dimensions mm
Scanning Unit 318 × 228 × 241
Scanner 203 × 165 × 165
Motion Controller 51 × 89 × 248
Environmental Conditions
  Indoor use
Temperature 5°C – 40°C
Altitude Up to 2000m
Maximum relative humidity 80% for temperature up to 31°C decreasing linearly to 50% relative humidity at 40°C

Ordering Information - Goniometric Radiometer Far-Field Profilers

All Goniometric Radiometer LD 8900 Far-Field Profiler Systems include the Scan Unit, PCI Controller Interface, Current MS Windows software, including ActiveX Automation commands.
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 consult the factory.

      Item Description P/N  
     
  LD8900/InGaAs Goniometric Radiometer for characterizing the angular radiation intensity from a laser diode between 800nm and 1700nm wavelength. Entrance aperture 2mm. PH00173  
         
  LD8900/Si Goniometric Radiometer for characterizing the angular radiation intensity from a laser diode between 320nm and 1100nm wavelength. Entrance aperture 2mm. Full 3D capability. Features dynamic range >36dB with 0 dB source. PH00174  
         
  LD8900R/InGaAs Wide Dynamic Range Goniometric Radiometer for characterizing the angular radiation irradiance from a fiber optic, wave guide, laser diode, VCSEL, or LED between 800nm and 1700nm wavelength. PH00175  
         
  LD8900R/Si Wide Dynamic Range Goniometric Radiometer for characterizing the angular radiation irradiance from a fiber optic, waveguide, laser diode, VCSEL or LED between 320nm and 1100nm wavelength. Full 3D capability. PH00176  
         
  Options  
         
  Pulsed
InGaAs Option
Failsafe operation for pulsed sources operating at repetition rates >10kHz with pulse widths >500ns. For operation below 10kHz, there are possible gain saturation states, dependent on repetition rate, pulse width, and source power. Consult the factory when operating under these conditions for failure mode assessment. When questionable, pulsed source operation should be verified against CW operation. PH00185  
         
  Pulsed
InGaAs Upgrade Option
Pulsed Upgrade Option to an existing Goniometric Radiometer InGaAs system. Failsafe operation for pulsed sources operating at repetition rates >10kHz with pulse widths >500ns. For operation below 10kHz, there are possible gain saturation states, dependent on repetition rate, pulse width, and source power. Consult the factory when operating under these conditions for failure mode assessment. When questionable, pulse source operation should be verified against CW operation. Includes software upgrade. Contact Factory for details. PH00186  
         
  PCI Controller Upgrade Interface to allow use with standard PCI interface of desktop PC. Includes an interface box for 9180 controller card, PCI Interface card and cable, and factory calibration and realignment. System should be returned to Photon for installation. Includes software upgrade. PH00187  
         
  Optional Mount of User Device -LD 8900 Mount Photon will provide one semi-custom mount of customer's laser diode device. Submit device particulars for specific quote. With this option, the instrument can be used immediately and provides one example test fixture. PH00181  
         
  LD8900 Software Viewer Goniometric Radiometer Software Viewer for LD8900 models (8-bit). Allows users to open, review and re-analyze files that are saved using any PC computer. The Viewer has all the data processing features of the software. You can read files saved. PH00182  
         
  LD8900R Software Viewer Goniometric Radiometer Software Viewer for LD8900R models (16-bit). Allows users to open, review and re-analyze files that are saved using any PC computer. The Viewer has all the data processing features of the software. You can read files saved. PH00439  
         
  Fiber Mount - /FC Plate and mount for a single mode fiber with FC connector. Label on plate includes reference distance between source and datum plane. PH00189  
         
  Fiber Mount - /SC Plate and mount for a single mode fiber with SC connector. Label on plate includes reference distance between source and datum plane. PH00190  
         
  Fiber Mount - /ST Plate and mount for a single mode fiber with ST connector. Label on plate includes reference distance between source and datum plane. PH00191  
         
  Fiber Mount -/BF Plate and mount for a single mode fiber without connector. Label on plate includes reference distance between source and datum plane. PH00192  
         
  Option to Fiber Mount /BF - /Ribbon Optional 4-Fiber Ribbon Cartridge for the Fiber Mount /BF (Bare Fiber). Requires /BF. PH00193  
         
  NIST Reference Standard N.A. Reference Standard: traceable to NIST for use with Goniometric Radiometer/Far-Field profilers; i.e. LD8900 and/or LD8900R. Data provided: N.A. and Angular Widths at 50%, 13.5% and 5% clip levels, with standard deviation [with a recorded, exact source to aperture distance]. NIST reference standard includes: LD source Single Mode Test Fiber Required Mounting Plate in a storage case. PH00188  
         
  Beam Profilers Beam Profilers Catalog
129 pages (6.46 MB )
  BeamGage LD 8900 and LD 8900R Manual
168 pages (2.40 MB )