1. Dual Laser Fiber Launch System
I have build this laser fiber launch system using two Actoprobe lasers (405 and 532nm-20mW) and off the shelf components from ThorLabs. The
System is compact, portable and easy to align and use.

2. Coupling Efficiency The coupling efficiency to SM fiber of this
system is about 10%.
I am using two mirrors
for parallel alignment
(decenter) and a fiber
port PAF-X-18-A (to
launch fiber) to
control X-Y-Z offset
and tilt. No beam
expander is being
used to overfill the
back aperture of
the port.

3. Alignment and Parts
Lasers
Upstream downstream
IRIS and mirrors
ND filters
I first align the lasers by using upstream downstream mirrors along the
alignment arm (upstream and down stream IRIS). Then I replace the
alignment arm with port and adjust the X-Y-Z and tip on the fiber port.
I also Installed two ND filter wheels to adjust the intensity.

4. Stability and Cost
The system is built within the cage system so it has a good stiffness, the system does not get easily misaligned when moved from place to place.
Right now it is blue and green but it is easy to add another channel to make it RGB.
I am using off the shelf components so the cost of this system is around $1800 including the lasers.
Fiber ports

5. By: Pranav Rathi (PhD)
Confocal Raman Microscope