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LD 8900 and LD 8900R Far-Field Profilers
Characterize divergent light source with Goniometric Radiometer technology
Challenged by trying to profile divergent light sources? Photon's far-field profilers characterize the angular radiation intensity of light simply and accurately. 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.
“After finishing the evaluation of available far-field measurement systems we have decided to use the LD8900 for our future developments. That's because of its performance and its easy integration from the software and hardware aspect. We also appreciate the fast and competent support from Photon during the system optimisation.”
These far-field profilers provide 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 0.055° 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 now 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. These far-field profilers are modular units designed for R&D, manufacturing, and custom applications, such as testing LDs at the wafer level, measuring optical fiber attributes.
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).
Alignment to the "Gonio" instruments is straightforward and requires minimal manipulation of the sources. All measurements are made with both source and detector stationary. The system can easily be incorporated into automated test protocols and interfaced via ActiveX software communication.
| LD 8900/LD 8900R System Specifications | |
|---|---|
| Sensor/Detector | |
| Scan Radius: | 84 mm |
| Pinhole Size: | 1000micron (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, 3241 points/scan |
| Source Power: | 10's of µW to 10's of W |
| Source Output: | CW or Pulsed (rep rates > 10 kHz) |
| Wavelength Measurement: | Optional |
| Statistics Calculated: | Value, Mean, Minimum, Maximum, Standard Deviation |
| Spectral Range | |
| Silicon detector: | 320 - 1100nm |
| InGaAs detector: | 800 - 1700nm |
| 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 |
| Software Views | |
| Polar profile View, single or perpendicular scans | |
| Rectangular profile View, single or perpendicular scans | |
| 3D Polar View | |
| 3D Rectangular View | |
| 3D Scan Replay | |
| Centroid Cross Sections | |
| 2D Topographic View | |
| Beam Parameter Statistics | |
| Time Statistics Charts | |
| Power Distribution with 3D Centroid | |
| Notes window for appending user comments | |
| Data Update Rates | |
| Single scan updates: | ~ 5Hz |
| Perpendicular Scan updates: | ~ 0.5Hz |
| 3D Profile Acquisition Time (times are PC dependent): | |
| 10 azimuthal scans: | ~10s |
| 20 azimuthal scans: | ~20s |
| 50 azimuthal scans: | ~35s |
| 100 azimuthal scans: | ~60s |
| 200 azimuthal scans: | ~100s |
| File Saving and Data Logging | |
| Program Data and Setup Configuration Files | |
| Ascii file Profiles and Summary Parameters | |
| Raw 3D Scan Data in binary format | |
| Log to Files and COM Ports | |
| Screen Captures: | BMP, JPG, GIF, TIFF, PNG |
| Computer/Electrical | |
| Software Operating System: | Windows 2000 Professional; Windows XP |
| Communications: | RS-232 Serial COM port required ActiveX Automation |
| 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. |
| Mechanical Dimensions (in mm) | |
| Scanning Unit: | 318 X 228 X 241 |
| Scanner: | 203 X 165 X 165 |
| Motion Controller: | 51 X 89 X 248 |
| Environmental Conditions | |
| Temperature: | 5°C to 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 |
Specifications subject to change without notice
- CPU: 1 GHz Pentium 4, Celeron, or better
- OS: Microsoft Windows 2000 Professional, XP Professional, or Windows Vista Business
- PCI: 1 open slot
- RAM: 512 MB
- Video: Support OpenGL and a minimum resolution of 1024x768
- Scan Unit Dimensions: 206x165x190mm
- Scan Unit Weight: ~6kg
- LD 8900HDR - Highest dynamic range far-field Profiler
- LED Profiler - Made especially for LED profiling
- Application Note PDF - Goniometric Radiometer Alignment
