Title:
Steady-State Ultracold Sr Near Quantum Degeneracy - Applications in CW Atom Laser and Clocks
Steady-State Ultracold Sr Near Quantum Degeneracy - Applications in CW Atom Laser and Clocks
Speaker:
陳俊嘉 (Chun-Chia Chen), PhD student, University of Amsterdam
陳俊嘉 (Chun-Chia Chen), PhD student, University of Amsterdam
Time:
03/30 (Sat.) 5 pm PDT, 6 pm MDT, 7 pm CDT, 8 pm EDT
03/31 (Sun.) 8 am Taiwan
03/30 (Sat.) 5 pm PDT, 6 pm MDT, 7 pm CDT, 8 pm EDT
03/31 (Sun.) 8 am Taiwan
Keywords:
Physics, Cold atom, Quantum gas, Precision measurement, Atomic clock
Physics, Cold atom, Quantum gas, Precision measurement, Atomic clock
Abstract:
So far, BECs and atom lasers have only been demonstrated as the product of a time sequential, pulsed cooling sequence. For applications such as next generation atomic clocks, superradiant lasers or atom interferometers for gravitational wave detection, a steady-state source of degenerate atoms offers great advantages. We present an apparatus that produces a steady-state strontium sample with a phase-space density approaching degeneracy, thus taking a critical step towards demonstrating steady-state atom lasers. Our machine achieves this by simultaneously cooling atoms in spatially separated regions on both the 30-MHz and 7.4-kHz linewidth Sr transitions. We then continuously load a dipole trap where a Stark shift protected dimple collects the coldest atoms. Finally, we demonstrate a new deceleration method that might bridge the gap between the unity phase-space density now demonstrated and an eventual steady-state BEC.
So far, BECs and atom lasers have only been demonstrated as the product of a time sequential, pulsed cooling sequence. For applications such as next generation atomic clocks, superradiant lasers or atom interferometers for gravitational wave detection, a steady-state source of degenerate atoms offers great advantages. We present an apparatus that produces a steady-state strontium sample with a phase-space density approaching degeneracy, thus taking a critical step towards demonstrating steady-state atom lasers. Our machine achieves this by simultaneously cooling atoms in spatially separated regions on both the 30-MHz and 7.4-kHz linewidth Sr transitions. We then continuously load a dipole trap where a Stark shift protected dimple collects the coldest atoms. Finally, we demonstrate a new deceleration method that might bridge the gap between the unity phase-space density now demonstrated and an eventual steady-state BEC.
No comments:
Post a Comment