Laser cooling system for caesium.
In this final year project, a laser system was built for cooling 133Cs. We build 2 external cavity diode lasers (ECDL) at 852nm, serving as the lasers for cooling and repumping of 133Cs. The power from one of the ECDL was ampli ed with a tapered ampli er(TA) in the master oscillator power...
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Format: | Final Year Project |
Language: | English |
Published: |
2012
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Subjects: | |
Online Access: | http://hdl.handle.net/10356/48689 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | In this final year project, a laser system was built for cooling 133Cs. We build 2 external
cavity diode lasers (ECDL) at 852nm, serving as the lasers for cooling and repumping of
133Cs. The power from one of the ECDL was ampli ed with a tapered ampli er(TA) in the
master oscillator power ampli er (MOPA) con guration. Both lasers are frequency stabilized
to within 1MHz by two di erent techniques: AC locking using saturated absorption
spectroscopy, and trombone locking using beat signal. Then acousto-optic modulators
(AOM) are used to o set and ne tune the frequency of the various lasers beam required
for the cooling experiment. All electronics that required for stabilizing laser were hand
build, this include current controller, temperature controller, AOM controller, COSY box
driver, PI controller and Log-in ampli er. A compact con guration of Doppler free saturation
spectroscopy(COSY box) use in AC locking was also designed and hand build
by author. The 133Cs cooling system setup and laser stabilization will be discuss in this
thesis. |
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