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The most delicate parts of a QCL are the laser chip itself and the
bonds connecting it to the ceramic pads. Therefore the QCL should be
touched only at the copper carrier (far from the laser chip and the
bonds), or at the ceramic pads (again away from the bonds).
To insert it into or to take it out of the Starter Kit housing, gently
grab the ceramic pad from above with fine tweezers, and whenever possible,
carry the QCL placed flat on a stable surface. Take special care not
to touch bonds nor the laser chip itself, since this can immediately
destroy the QCL.
Avoid contact of the front facet of the QCL with any object (like the walls of a box where it is stored).