We measure the critical scattering length for appearance of first three-body bound state, or Efimov parameter, at seven different Feshbach resonances in ultracold $^{39}\mathrm{K}$ atoms. study both intermediate and narrow resonances, where spectrum is expected to be determined by nonuniversal coupling two channels. Instead, our observed ratio parameter with van der Waals radius approximately same universal as broader resonances. This unexpected observation suggests presence a new regime

We investigate the sub-Doppler laser cooling of bosonic potassium isotopes, whose small hyperfine splitting has so far prevented below Doppler temperature. find instead that combination a dark optical molasses scheme naturally arises in this kind system and an adiabatic ramping parameters allows us to reach temperatures for detunings. demonstrate as low $25\ifmmode\pm\else\textpm\fi{}3$ $\ensuremath{\mu}$K $47\ifmmode\pm\else\textpm\fi{}5$ high-density samples two isotopes ${}^{39}$K...

We discuss the implementation and characterization of source a slow, intense, collimated beam rubidium atoms. The cold atomic is produced by two-dimensional magneto-optical trapping in directions transverse to axis unbalanced Doppler cooling axial direction. vacuum design allows use relatively low laser power considerably simplified assembly. has high flux about $2\ifmmode\times\else\texttimes\fi{}{10}^{10}\phantom{\rule{0.3em}{0ex}}\mathrm{atoms}∕\mathrm{s}$ at total...

We report the realization of a Bose-Einstein condensate ${}^{39}$K atoms without aid an additional atomic coolant. Our route to condensation comprises sub-Doppler laser cooling large clouds with more than ${10}^{10}$ and evaporative in optical dipole trap where collisional cross section can be increased using magnetic Feshbach resonances. Large condensates almost ${10}^{6}$ produced less 15 s. achievements eliminate need for sympathetic Rb atoms, which was usual implemented until now due...

We present the design, implementation and detailed experimental characterization of two-dimensional Magneto-optical traps (MOT) bosonic $^{23}$Na $^{39}$K atoms for loading cold atomic mixture in a dual-species 3DMOT with large number atoms. report our various measurements pertaining to characterisation two 2D$^+$MOTs via capture rate also optimised parameters best performance system mixture. In condition, we more than $3 \times 10^{10}$ $5.8 10^8$ simultaneously from individual $5 atoms/sec...

We report our measurements of the absolute transition frequencies 5P_3/2,F = 3 to nS and nD Rydberg states 87Rb with high principal quantum numbers in a wide range values (n 45-124). The were performed using Electromagnetically Induced Transparency (EIT) ladder-type three-level systems. measure an accuracy less than 2 MHz. determine Rydberg-Ritz parameter for from experimental frequencies. Our highly excited would be useful diverse applications information processing, simulation sensing atoms.

The possible existence of a magnetic pole has been under discussion for many years. Dirac worked out in detail an electro-dynamics which single is assumed to exist (1,2). He shown that the such leads naturally quantization charge, strength g and electric charge e being related by equation where p integer, h Planck's constant divided 2π, c velocity light.

We report noninvasive detection of spin coherence in a collection Raman-driven cold atoms using dispersive Faraday rotation fluctuation measurements, which opens possibilities probing correlations quantum gases and other similar systems. demonstrate five orders magnitude enhancement the measured signal strength as compared to traditional noise spectroscopy with thermal equilibrium. Our observations are good agreement comprehensive theoretical modeling driven at various temperatures. The...

Rydberg atoms have highly controllable exotic properties such as strong inter-atomic interaction, high polarizability, and long lifetimes which enabled unprecedented progress in atom-based quantum Technologies. We present a brief review of recent the development technologies using atoms. highlight advances various regimes Information processing, sensing, simulation many-body physics single-photon sources for communications.

We report our experimental measurements and theoretical analysis of the position response function cold atoms in a magneto-optical trap (MOT) by applying transient homogeneous magnetic field as perturbing force. observe transition from damped oscillatory motion to an over-damped relaxation, stemming competition between viscous drag provided optical molasses restoring force MOT. Our observations are agreement with predictions model based on Langevin equation. also study diffusion atomic cloud...

We discuss our experimental results on forced evaporative cooling of cold rubidium 87Rb atoms to quantum degeneracy in an Optical Dipole Trap. The are first trapped and cooled a magneto-optical trap (MOT) loaded from continuous beam [1]. More than 1010 the MOT then about 108 transferred Quasi-Electrostatic Trap (QUEST) formed by tightly focused CO2 laser (λ = 10.6μm) beams intersecting at their foci orthogonal configuration horizontal plane. Before loading into dipole trap, phase-space...

Abstract. The world’s largest mangrove ecosystem Sundarbans lies in the southwestern part of Ganges-Brahmaputra Delta. health, function, and services forest depend on availability freshwater flow within deltaic system. rivers, which used to feed delta nourish now stand disconnected from their upstream sources. unavailability restricts growth freshwater-loving mangroves has potential affect health existing limiting ability provide services. Due high salinity, natural reproduction these...

In this Note we describe the design, construction, and calibration of an electronic wavelength-meter using a wavelength-sensitive dual-output photodiode. The device was constructed circuitry then calibrated various laser sources in wavelength range 500–850 nm. This is inexpensive compared to other similar devices available commercially. It very useful for determination wavelengths diode lasers. works well with multi-mode light, there are no stringent alignment requirements. extremely compact...