search

DoESLiverpool / somebody-should

A place to document practices on the wiki and collect issues/suggestions/to-do items for the physical space at DoES Liverpool
31 stars 11 forks source link

Gerald's beam is crescent shaped #249

Closed epsaul closed 8 years ago

epsaul commented 8 years ago

Re collimated. Checked beam at entry to mobile mirror housing using masking tape found beam to be sharp at this point. Removed final lens housing to check for dirt/debris. Problem persisted concluded mobile mirror needed collimating, used tripod adjustment to bring beam to a point.

amcewen commented 8 years ago

By "re collimated" do you mean you adjusted the mirrors to bring the beam back into alignment? (just checking for us non-optics people :-)

epsaul commented 8 years ago

Yep, strictly speaking It's the light that is collimated I think. This is achieved by the mirror (and other optical components) being aligned; so yes, realigned is probably the word to use. Collimated light is light whose rays are parallel and therefore don't disperse over distance traveled.. I think - I ceremonially burned my physics A level notes some decades ago! :-) Think this is the mechanism: http://www.estiasis.com/content/coma-aberration