Optical alignment Sample Clauses

Optical alignment. Starting with the configuration in Figure 1, the cryostat was exchanged for a Helium- Neon laser. To operate with this source working in the visible region of the spectrum, the FIR beam dividers (BD1 and BD2) were replaced by optical versions comprising of 0.9um Mylar stretched films. The condensing mirror, CM, at the cryostat was switched to a flat 45 degree mirror for convenience. Alignment required the beam to be running parallel to the bench and for it to be incident at the centre of every optical component that the beam encounters. The pair of fold mirrors on the FTS drive must have an angle of exactly 90 degrees between them to avoid beam walk off as the stage moves. Once aligned, any beam travelling up the moving arm will be returned parallel to the incident beam. Tools to complete this high level of alignment included an iris set at the correct optical beam height of 160mm, and a metal ruler to ensure beams were running parallel to one another.
Sample 1
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Related to Optical alignment

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