Vescent D2-135 Quick Setup Instructions

2022/03/09 21:11
Quick Setup Instructions (Offset Phase Lock
D2-135)
Please refer to the Quick Setup Instructions
Laser Controller to the Lasers.
At this point you should have two lasers temperature stabilized and running at their operating current.
The two lasers should be within a few GHz of the same frequency of each other. (If unsure of the laser
frequency, you can use a spectroscopy module to get one laser on transition and then temporarily
move the spectroscopy module to the other laser to get it near the same transition.)

D2-150 Alignment

This section assumes you are using the
between two lasers. If you have obtained an optical beat note by other methods, please skip this
section.
Schematic drawing of the laser alignment in to the
D2-150 Heterodyne Module.

First Laser Alignment

Use a power meter to measure the power out from the fiber connected to the D2-150. Block the laser
that has two adjustments and measure the power from the laser with one adjustment that gets
coupled into the fiber. Use the two adjustments on the beam splitter that affects the laser position to
maximize the power into the fiber. If you cannot measure any light from the fiber, it is often helpful to
put light into the fiber (opposite direction from how the system operates) and see how well that light
gets back to the laser. Adjust the same beam splitter so the light is aimed directly at the laser source.
Product Manuals - https://www.vescent.com/manuals/
1/4
for setting up the electronics modules and connecting the
D2-150 Heterodyne Module
Quick Setup Instructions (Offset Phase Lock D2-135)
to obtain an optical beat note
Place the two lasers and the D2-150 as
shown in figure
90° relative to each other and both pointing
at the D2-150. Take the top off the D2-150
and place it such that the beams of both
lasers hit the center of the first beam splitter
that they encounter. There are 3 adjustable
beam splitters in the D2-150: two for
aligning one laser, and one for aligning the
other laser. In
the laser with only one adjustment because
it passes straight-through the second beam
splitter on its way to fiber, while the slave
laser reflects at 90° off of two beam splitters.
It is important to align the laser with only
Fig. 1:
one adjustment stage first (the master laser
in the figure).
1: the two lasers oriented
figure 1 the master laser is