Log Book Entry No.102

Created: 27 Jun 2016 16:06:41

Last Revised: 30 Jun 2016 09:51:06

JosephBayley

Setting up beam splitter with optical fibre

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Finding focus of optical fibre

• The focus of the optical fibre was found by taking a relative distance between the lens and the position of the optical fibre, and measuring the amplitude of a spectral line from the laser found at 3.5mm.

• taken at 1mm intervals between 230m and 270mm.
• Fit with hyperbolae as approximation
• distance measured with ruler so very approximate i.e ±1mm
• Best focus was found at 250mm±2mm
• Iris was almost closed as the laser would saturate camera at shortest exposure.

• also took more data as SBIG ST-7E was cooling.
• Just need extra part to connect firewire camera, so that the alignment can be competed.

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