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689 nm Laser Stabilization and Cavity Design

689 nm Laser Stabilization and Cavity Design. Outline. 689 nm transition in strontium PDH lock and stabilization High finesse cavity considerations. 689 nm transition. 2. 1. 0. We will use a 532 nm optical lattice laser to add spatial confinement to our MOT. Doppler limited temperature.

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689 nm Laser Stabilization and Cavity Design

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  1. 689 nm Laser Stabilization and Cavity Design Graham Lochead 27/04/09

  2. Graham Lochead 27/04/09 Outline • 689 nm transition in strontium • PDH lock and stabilization • High finesse cavity considerations

  3. Graham Lochead 27/04/09 689 nm transition 2 1 0 We will use a 532 nm optical lattice laser to add spatial confinement to our MOT Doppler limited temperature 1P1 3P 1D2 461 nm /2p = 32 MHz 689 nm /2p = 7.5 kHz TD≈ 1 mK TD≈ 0.2 μK 1S0

  4. Graham Lochead 27/04/09 689 nm linewidth Need to stabilize the linewidth to at least 10 kHz Linewidth is currently 600 kHz Measured using side of fringe technique

  5. Pound-Drever-Hall setup FPD Oscilloscope PS Laser Graham Lochead 27/04/09

  6. Graham Lochead 27/04/09 Locking and stabilization Strontium cell FPD Filter Feedback to cavity piezo Slow feedback to piezo PS Fast feedback to diode Laser

  7. Graham Lochead 27/04/09 Linewidth dependence The laser locks to the central feature of the error signal Increasing the error signal gradient strengthens the lock and reduces the linewidth Best when PS = 0.42 PC E. Black Am. J. Phys. 69 (1), January 2001

  8. Graham Lochead 27/04/09 Length stability Causes: Acoustic vibration Thermal vibration Air currents Solutions: Vibrationally isolate Thermally stabilize cavity Evacuate

  9. Graham Lochead 27/04/09 Cavity Low expansion spacer Mirror Rubber Mount

  10. Finesse Contributions to the finesse For spherical mirrors, finesse is dominated by reflectivity component W. Demtröder, Laser Spectroscopy Graham Lochead 27/04/09

  11. Graham Lochead 27/04/09 Transverse modes Standing waves inside cavity are Guass-Hermite waves Transverse modes, TEMlm, are set up

  12. Graham Lochead 27/04/09 Cavity peak spacing The transverse modes cause more cavity peaks where For a symmetric confocal cavity R1=R2=L transverse and longtiudinal modes are degenerate

  13. Graham Lochead 27/04/09 Stability condition Low loss condition 0<g1g2<1

  14. Graham Lochead 27/04/09 Overall cavity conditions Finesse = 10,000 r = 99.97% L = 10 cm FSR = 1.5 GHz = 150 kHz R = 50 cm Similar setups have lead to linewidths of 100 Hz Y.Li et. al Appl. Phys B 78, 315-320 (2004)

  15. Graham Lochead 27/04/09 Progress/Future work Progress Slow laser piezo lock Cavity design Future work Fast laser lock Cavity piezo lock Order and assemble cavity

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