1 / 10

Pulsed laser spectroscopy in strontium

Pulsed laser spectroscopy in strontium. Outline. Strontium project update Ladder EIT Electron shelving spectroscopy. Project update. Pyramid MOT Cavity 412 nm laser 420 nm laser. Optical setup. Pump laser. Dye laser. Dispenser. Baffle. Aperture. FPD. Lens. Cell.

ilario
Télécharger la présentation

Pulsed laser spectroscopy in strontium

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pulsed laser spectroscopy in strontium Graham Lochead 07/09/09

  2. Graham Lochead 07/09/09 Outline • Strontium project update • Ladder EIT • Electron shelving spectroscopy

  3. Graham Lochead 07/09/09 Project update • Pyramid MOT • Cavity • 412 nm laser • 420 nm laser

  4. Graham Lochead 07/09/09 Optical setup Pump laser Dye laser Dispenser Baffle Aperture FPD Lens Cell 461 nm light from fibre Dye laser parameters • ~5 mm beam diameter • 10 Hz repetition • 10 ns pulse duration • ~20 mJ per pulse • ~5 nm tuning range • ~2 GHz linewidth

  5. Ladder EIT (I) 5snd 1D2 lr> Δc ωr Probe: 5s21S0 → 5s5p 1P1 Couple: 5s5p1P1 → 5snd1D2 413 nm ωc le> 5s5p 1P1 Δp ωe 461 nm ωp 1P1 lifetime ~ 5 ns, Rydberg lifetime ~ 10 μs lg> 5s21S0 J.P. Marangos, J. Mod. Opt 45, p. 471-503 (1998) Graham Lochead 07/09/09

  6. Ladder EIT (II) Diagonalization of the Hamiltonian leads to new eigenstates: For Ωc >> Ωp and Δp = 0 Probe couples to excited state of both |+> and |-> which have equal but opposite transition probabilities, thus on-resonance probe not absorbed Coherent process – decoherence effects increase absorption Graham Lochead 07/09/09

  7. Simulations • Solve three level optical Bloch equations • Rydberg transition Rabi frequency from oscillator strength S.-U. Haq et al., EPJD 44, p. 439 (2007) Graham Lochead 07/09/09

  8. Graham Lochead 07/09/09 Catastrophe! Hole • Cell cleaned out • Reassembled and re-evacuated • Absorption seen again • Hole drilled in viewport • Vacuum lost

  9. Graham Lochead 07/09/09 Electron shelving 5snd 1D2 Probe: 5s21S0 → 5s5p 1P1 Couple: 5s21S0 → 5snd 1D2 Off-resonant two photon excitation to Rydberg state 435 nm 5s5p 1P1 Ωp 435 nm 461 nm Ωc 5s21S0 Unlikely to see EIT due to large decoherence Rydberg state has a long lifetime relative to 1P1 P. Thoumany et al., Optics Letters 34, p. 1621-1623 (2009)

  10. Graham Lochead 07/09/09 Outlook • Change dye to attempt electron shelving • Finish building pyramid MOT

More Related