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B Spectroscopy before tunable lasers?

  1. Nov 15, 2016 #1
    how was it done???
     
  2. jcsd
  3. Nov 15, 2016 #2

    DrClaude

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    I guess you mean absorption spectroscopy: wide-spectrum light source, a grating, and a narrow slit.
     
  4. Nov 15, 2016 #3
    sounds like a lot of setting up.
     
  5. Nov 15, 2016 #4

    DrClaude

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    More than a tunable laser???
     
  6. Nov 15, 2016 #5

    DrClaude

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  7. Nov 15, 2016 #6
    Edit - viewed link, nice instrument.
     
  8. Nov 15, 2016 #7

    DrClaude

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    I don't see the difficulty in that. In the old-old days, it was done manually (grating on a pivot), later using a motor.
     
  9. Nov 15, 2016 #8
    I guess if I got this right due to the physical set up a particular line you select is locked there indefinitely and you just know it's that wavelength forever.

    the only time I did real spectroscopy there was continual drift and I had to fix the wavelength with a beam splitter and compare to another sample of with known line. there was always mode hopping issues but that did not bother what I was doing.

    I suspect tunable lasers are prolly all automated now to stay on a line. the bandwidth was very narrow, would like to know what the bandwidth is for the antique instrument in the link.
     
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