Polishing
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Figure 64 Correct vs incorrect beam profile
When the fiber facet is clean and undamaged, the emitted beam has a noticeable
hexagonal shape which is the correct beam profile. An Incorrect beam profile
occurs as a result of a damaged or dirty fiber facet. In this case, the emitted beam
is random in direction and displays considerable variation in color.
Damaged facet If the fiber facet is damaged, the connector must be re-polished before operating
the laser. Failing to do so, could result in incorrect measurements/usage or even
damage to the laser unit itself.
Caution: A SuperK COMPACT is equipped with a Photonic Crystal Fiber (PCF).
The connector attached to it should NOT be removed, special equipment and pro-
cedures are required to fit a new connector with the fiber.
Polishing
The end of the fiber is collapsed to a length of 150-200 microns. This allows
enough length to polish the fiber end; however, you must be careful not to over
polish and generally NKTP recommends to return the unit for factory polishing.
The general procedure is to:
1. Clean the connector and quickly and very lightly, polish the connector end.
Caution: Do not over-polish the connector end (fiber facet). Over-polishing the
connector end will damage it due to its limited length.
2. Clean the connector and then switch the source on. Observe the exit beam
on a screen. If it is not a well-formed single mode emission, repeat step 1.
3. Continue this "quick polish, check beam" process until a well-formed beam is
obtained.
If you do not obtain a good beam profile after polishing, the connector may be
damaged. Return the laser to NKT Photonics for repair. Note that this type of
repair is not covered by warranty.
Correct beam profile
Incorrect beam profile
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