Photon inc. products - LD 8900 - Far Field Angular Profiler Goniometric Radiometer

For Characterizing Laser Diodes, LEDs, VCSELs and Fiber Optics.

Photon's LD 8900 Goniometric Radiometer for characterizing the angular radiation intensity of light provides direct real-time far-field measurements with 24 dB dynamic range, angular sampling of 0.055° and a field-of-view of &plusmin;72° (144°). The LD 8900 is ideal for characterizing the light flux from many light-emitting sources, including VCSELs, laser diodes, optical fibers, optical wave-guides, and more. The LD 8900 provides full three-dimensional measures of the far-field pattern in minutes or less, with better resolution than a CCD camera.

The LD 8900 is available with either a silicon detector or an InGaAs detector, and has a standard entrance aperture of 2 mm, with an optional 10-mm entrance aperture for use with large sources such as LEDs and LD bars. The LD 8900 is a modular unit designed for R&D, manufacturing, and custom applications, such as testing LDs at the wafer level, measuring optical fiber attributes. The complete system includes:

The Scan Unit
The Motion Control Module
PC (monitor is user supplied) with the Goniometric Radiometer Model GS880 Scan Control and Data Acquisition Card installed
Goniometric Radiometer Acquisition and Analysis Software for user-specified MS Windows 98 or Windows NT 4.0
Power and Instrument Cables

An optional LD 8900 semi-custom source mount, specifically designed to meet your application needs, can be quoted upon request.

LD 8900R Applications

Measure:

Numerical Aperture
Scatter pattern of a transmitting diffuser
Optical waveguides
Influence of elements in the light domain, e.g., lenses, filters, waveguides
Pigtailed light sources
Single- and multi-mode fiber

Optimize:

Coupling of energy:

Fiber
Cavity
Lenses
Detectors
Array waveguides
Dispersion-compensating elements
WDM mux/demux
Other optical elements

Goniometric Radiometer Brochure - PDF File (1.5 Mb)

PDF files require Adobe Acrobat Reader software, available free from Adobe Systems.

Accessories:

Use any computer (without the Goniometric Radiometer hardware) to open, review and re-analyze files that you saved with Goniometric Radiometer software.

Specifications:

Parameters measured:

Numerical Aperture (NA)
Numerical Aperture (NA)
Angular Widths
Angular Width Ratios
Angular Position
Intensity or Amplitude
Relative Integrated Power
Relative Power in user-specified cone angles about an arbitrary axis

Display Pattern:

Rectangular coordinates

Contour
3D

Polar

Single or orthogonal profiles
Relative angular power distribution

Accuracy:

NA: <±1%

Angular Width:

<±0.05°

Scan Range

±72°

Scan Radius:

84 mm

Scan Time*:

Single scans update: 5 Hz
3D scan: >>10s-100s
(depending on number of scans)

Dynamic range:

24 dB

Data points:

3241-single scan
648,200-200 azimuth

Spatial Sampling Resolution:

0.055°

Spectral Range:

InGaAs: 800-1700 nm
Si: 320-1100 nm

Software:

Windows 95/98/ME
Windows NT 4.0/2000 Professional
ActiveX Automation server capability

Scan unit dimensions:

206x165x190 mm

Scan unit weight:

~6 kg

*Times are PC dependent

Software Window Descriptions

Rectangular View - This window displays the data from either a single axis scan or perpendicular axes scans with measured amplitude vs. angle in rectangular coordinates.

Polar View - This window displays the data from either a single axis scan or perpendicular axes scans with measured amplitude vs. angle in polar coordinates.

3D Polar View - Opens the 3D Polar View window. This window displays data from 3D acquisitions in a "3-dimensional" viewing format in spherical coordinates. The image can be rendered with either a wireframe or solid surface.

3D Rectangular View - Opens the 3D Rectangular View window. The 3D Rectangular View window displays the source intensity pattern in a "3-dimensional" viewing format in cylindrical coordinates. The image can be rendered with either a wireframe or solid surface, with user selected clip levels and colors.

Topographic View - This window displays the data from 3D acquisitions with false color in polar coordinates.

Beam Statistics - This window displays a tabular summary of beam parameters and statistics. It is also used for Limit Analysis. The parameters for viewing are user selectable.

Time Statistics - The Time Statistics window displays strip charts of beam parameters versus sample number or time. Any or all of the computed beam parameters may be viewed in this way. Several overlays are available in the options menu, including grids, statistical markers, and numerical statistical summaries.

Power - The Power window displays a graph of the cumulative angular power, determined along either the instrument optical axis or the 3D centroid axis. It also displays numerical values of the power within 3 user specified cones around either axis, and the q and f values of the angular 3D centroid of the profile.

Notes - Opens the Notes Window used for entering user information.