Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) On 13 Jan 2015 20:39, "Neville Michie" <namic...@gmail.com> wrote: > THe stability /accuracy of lasers is entirely dependent on the cavity length. > Materials used are usually invar or silica, so you are no better off than > with a quartz crystals. > They are just a resonant cavity. > cheers, > Neville Michie
I do realise that thermal stability is important. The pulsed titanium sapphire laser I used during my PhD took about 8 hours to become stable, and that had a lump of invar in it which was probably about 1.2 m long and 120 mm in diameter. But to say that the stability/accuracy depends entirely on the cavity length is a gross simplification. Someone posted a link to some information on getting narrow linewidths from cheap semiconductor lasers with something as simple as a piece of glass in front. That does nothing to stabilise the cavity length. There's a free webiminar on the 29th Jan at 1300 PST with the title "Laser Test of RIN, Linewidth and Optical Noise Parameters". http://www.microwavejournal.com/events/1310-laser-test-of-rin-linewidth-and-optical-noise-parameters Dave. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.