scholarly journals An ultra-high flux matter-wave laser from a highly flexible ioffe-pritchard trap

2014 ◽  
Author(s):  
Βασιλική Μπόλπαση
Keyword(s):  
High Resolution ◽  
Magnetic Trap ◽  
Matter Wave ◽  
High Resolution Spectroscopy ◽  
High Flux ◽  
Atom Beam ◽  
Atom Number ◽  
Wave Laser ◽  
Atom Lasers ◽  
Bose Einstein

This thesis describes the development and construction of a machine for producinghigh atom-number Bose-Einstein Condensates (BECs). Emphasis is given to thenovel Ioe-Pritchard magnetic trap used, that consists exclusively of circular coils.This allowed us to achieve higher gradients and thus tighter connements [1].This thesis also describes a novel atom-laser output-coupler based on time dependentadiabatic potentials (TDAP) [2]. In this method strong rf elds are usedto deform the trapping potential. Contrary to the traditional weak rf methods thatextracts the atoms from the center of the BEC, the TDAP atom lasers emerge fromthe edge of the condensate. This provides the atom lasers with low divergence.Furthermore, the atoms are outcoupled from the BEC at an arbitrarily large rateleading to uxes per trapped atom sixteen times higher compared to the brightestquasi-continuous atom laser.Finally, presented is the coldest thermal atom beam to date. Using the TDAPoutcoupling, we produced thermal atom beams with temperatures as low as 200 nK,which makes it, by two orders of magnitude, the coldest thermal beam ever observed.Something like that would be very useful for high-resolution spectroscopy of ultracoldcollisions.

scholarly journals High resolution imaging and optical control of Bose-Einstein condensates in an atom chip magnetic trap

2013 ◽  
Vol 102 (8) ◽  
pp. 084104 ◽  
Author(s):  
Evan A. Salim ◽  
Seth C. Caliga ◽  
Jonathan B. Pfeiffer ◽  
Dana Z. Anderson
Keyword(s):  
High Resolution ◽  
Magnetic Trap ◽  
Optical Control ◽  
High Resolution Imaging ◽  
Atom Chip ◽  
Resolution Imaging ◽  
Bose Einstein

scholarly journals An atomic Fabry–Perot interferometer using a pulsed interacting Bose–Einstein condensate

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
P. Manju ◽  
K. S. Hardman ◽  
P. B. Wigley ◽  
J. D. Close ◽  
N. P. Robins ◽  
...  
Keyword(s):  
Scattering Length ◽  
Einstein Condensate ◽  
Matter Wave ◽  
Pitaevskii Equation ◽  
Atom Number ◽  
Experimental Realization ◽  
Bose Einstein Condensate ◽  
Fabry Perot ◽  
Resonant Transmission ◽  
Bose Einstein

Abstract We numerically demonstrate atomic Fabry–Perot resonances for a pulsed interacting Bose–Einstein condensate (BEC) source transmitting through double Gaussian barriers. These resonances are observable for an experimentally-feasible parameter choice, which we determined using a previously-developed analytical model for a plane matter-wave incident on a double rectangular barrier system. Through numerical simulations using the non-polynomial Schödinger equation—an effective one-dimensional Gross–Pitaevskii equation—we investigate the effect of atom number, scattering length, and BEC momentum width on the resonant transmission peaks. For $$^{85}$$ 85 Rb atomic sources with the current experimentally-achievable momentum width of $$0.02 \hbar k_0$$ 0.02 ħ k 0 [$$k_0 = 2\pi /(780~\text {nm})$$ k 0 = 2 π / ( 780 nm ) ], we show that reasonably high contrast Fabry–Perot resonant transmission peaks can be observed using (a) non-interacting BECs, (b) interacting BECs of $$5 \times 10^4$$ 5 × 10 4 atoms with s-wave scattering lengths $$a_s=\pm 0.1a_0$$ a s = ± 0.1 a 0 ($$a_0$$ a 0 is the Bohr radius), and (c) interacting BECs of $$10^3$$ 10 3 atoms with $$a_s=\pm 1.0a_0$$ a s = ± 1.0 a 0 . Our theoretical investigation impacts any future experimental realization of an atomic Fabry–Perot interferometer with an ultracold atomic source.

Fast high-resolution spectroscopy of dynamic continuous-wave laser sources

2010 ◽  
Vol 4 (12) ◽  
pp. 853-857 ◽  
Author(s):  
F. R. Giorgetta ◽  
I. Coddington ◽  
E. Baumann ◽  
W. C. Swann ◽  
N. R. Newbury
Keyword(s):  
High Resolution ◽  
Continuous Wave ◽  
High Resolution Spectroscopy ◽  
Continuous Wave Laser ◽  
Laser Sources ◽  
Wave Laser

ATOM-OPTICAL BISTABILITY IN TRAPPED BOSE–EINSTEIN CONDENSATES

2000 ◽  
Vol 14 (01) ◽  
pp. 31-37 ◽  
Author(s):  
ZENG-BING CHEN
Keyword(s):  
Nonlinear Optics ◽  
Master Equation ◽  
Optical Bistability ◽  
Einstein Condensate ◽  
Matter Wave ◽  
Atom Optics ◽  
Bose Einstein Condensate ◽  
Atom Lasers ◽  
Bose Einstein ◽  
Markov Master Equation

The close similarities between nonlinear optics and nonlinear atom optics motivate us to demonstrate the possibility of atom-optical bistability for a trapped Bose–Einstein condensate. Driven by an intense, coherent input matter wave, the trapped Bose–Einstein condensate might display the bistability when the Born–Markov master equation for the condensate mode is used. The atom-optical bistability provides a way to control atom lasers with atom lasers.

SPATIAL TUNING OF BOSE-EINSTEIN CONDENSATIONS

2007 ◽  
Vol 21 (23n24) ◽  
pp. 4265-4270 ◽  
Author(s):  
GUANGJIONG DONG
Keyword(s):  
Wave Scattering ◽  
Scattering Length ◽  
Critical Value ◽  
Matter Wave ◽  
Einstein Condensation ◽  
S Wave ◽  
Atom Number ◽  
Spatial Tuning ◽  
Spatially Periodic ◽  
Bose Einstein

We briefly review our recent work on spatial tuning of Bose-Einstein condensation (BEC). We first study spatially periodic tuning of the s-wave scattering length for controlling the propagation of a BEC matter wave, and find matter wave limiting processing and bistability. Second, we show that a stable BEC with natural attractive interaction could be formed by tuning the s -wave scattering length with a Gaussian optical field, but the condensed atom number should be less than a critical value. Further, we apply Thomas-Fermi approximation to obtain a formula for this critical value.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

scholarly journals Ultracold atom interferometry in space

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maike D. Lachmann ◽  
Holger Ahlers ◽  
Dennis Becker ◽  
Aline N. Dinkelaker ◽  
Jens Grosse ◽  
...  
Keyword(s):  
Spatial Coherence ◽  
Free Fall ◽  
Atom Interferometry ◽  
Matter Wave ◽  
Sounding Rocket ◽  
Ultracold Atom ◽  
Fundamental Physics ◽  
Light Pulses ◽  
Bose Einstein ◽  
Promising Source

AbstractBose-Einstein condensates (BECs) in free fall constitute a promising source for space-borne interferometry. Indeed, BECs enjoy a slowly expanding wave function, display a large spatial coherence and can be engineered and probed by optical techniques. Here we explore matter-wave fringes of multiple spinor components of a BEC released in free fall employing light-pulses to drive Bragg processes and induce phase imprinting on a sounding rocket. The prevailing microgravity played a crucial role in the observation of these interferences which not only reveal the spatial coherence of the condensates but also allow us to measure differential forces. Our work marks the beginning of matter-wave interferometry in space with future applications in fundamental physics, navigation and earth observation.

Sign in / Sign up

Export Citation Format

Share Document