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Table of Contents
D2-250 Heterodyne Module
Model No. D2-250
Document Revision: 1
Document Last Updated on 2021/08/26 14:26
Please read Limited Warranty and General Warnings and Cautions prior to operating the D2-250.
Description
The D2-250 heterodyne module is designed to provide a fiber-coupled heterodyne optical beat note formed by picking-off a small proportion of light from each of two laser beams. Light is coupled into a multi-mode fiber. A second output port can be used to align the overlap the two picked-off beams. The light entering the module should be linearly polarized in either vertical or horizontal direction for best results.
Purchase Includes
- D2-250 Heterodyne Module
Absolute Maximum Ratings
Note: All modules designed to be operated in laboratory environment
Parameter | Rating |
Environmental Temperature | >15°C and <30°C |
Environmental Humidity | <60% |
Environmental Dew Points | <15°C |
Specifications
Value | Units | |
---|---|---|
In-coupling | Free-space | % |
Wavelength Range | 700 - 1,000 | nm |
Input Power Range | 0.1 - 200 | mW |
Pick-off Percentage | 1 - 98 | % |
Transmission | up to 98 | % |
Input Polarization | Linear | Horizontal or Vertical |
Minimum Power in Beat Note | >50 μW, optimally 200 μW | for use with D2-160 |
Maximum Power at Detector1) | <1 | mW |
Fiber Connector | FC | |
Compatible Fiber Type | MM, PM |
Components
The D2-250 Heterodyne Module utilizes the same three pickoff-cube architecture as the D2-150. With this revision, each input beam passes through a rotatable zero-order half-waveplate prior to a polarizing beam splitter, enabling the user to adjust the amount of power from each source beam diverted to the optically mixed outputs. A 50:50 non-polarizing beam splitter overlaps the pickoff light into a fiber coupler. Each cube rests on a 2-axis kinematic mount adjustable from the module exterior, enabling horizontal and vertical beam pointing adjustment.
Alignment Procedure
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