THORLABS Vytran LFS4100, User Manual

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LFS4100 Chapter 7: Maintenance
Rev B, July 24, 2018 Page 33

To home the splice head vertically, press the “Filament Home” macro button. Then, type 5motorto (14
@14) into the command window and hit “Enter.” View the image on the screen to make sure the fiber is
still centered in the filament. If the position is OK, enter 5writeuserdata() to make the change permanent.

The user should also check that the filament does not contact the fiber when it is raised and lowered.

If the filament does contact the fiber, check that the fiber is properly loaded in the fiber holding block V-
grooves. Also check that the correct V-grooves are being used.

If the filament position is alright, then send the lens home.

Home the fiber holding blocks.

The filament is now ready for normalization.
7.3. Cleaning the Mirror
The fiber image can be distorted by debris that accumulates on the mirror surfaces. This debris may be dust from
the atmosphere, small pieces of fiber coating, finger prints, etc. Great care must be taken when cleaning the
mirror surfaces, as they are all front silvered. If it is possible to visibly discern debris in the fiber image then the
mirrors should be cleaned. If the focus processes are failing then that is also a sign that the mirrors may need
cleaning.
Procedure:

Move the lens assembly to home.

Move the fiber holding blocks to home.

View each mirror surface using a 10x
eye loop.

Remove debris using a clean cotton
swab and a commercial lens cleaner.
Note: The mirrors are front silvered.
Only use clean cotton swabs. Never use
a cotton swab that has been laying on
the work surface. Dust particles will
scratch the mirror.

Wipe the mirror surface in a single
direction, rotating the swab to lift debris
away from the mirror surface. Do not re-
use the Cotton swab.

View the mirror through the eye loop.
Re-clean if necessary.

Repeat for all mirror surfaces as required
.