arXiv subjects

K. L. Corwin

Publications and source records attributed to K. L. Corwin.

3 recordsLinked to original sources

arXiv2002

Fundamental noise limitations to supercontinuum generation in microstructure fiber

Broadband noise on supercontinuum spectra generated in microstructure fiber is shown to lead to amplitude fluctuations as large as 50 % for certain input laser pulse parameters. We study this noise using both experimental measurements and numerical simulations with a generalized stochastic nonlinear Schroedinger equation, finding good quantitative agreement over a range of input pulse energies and chirp values. This noise is shown to arise from nonlinear amplification of two quantum noise inputs: the input pulse shot noise and the spontaneous Raman scattering down the fiber.

physics.optics↗

arXiv2001

A quasi-pure Bose-Einstein condensate immersed in a Fermi sea

We report the observation of co-existing Bose-Einstein condensate and Fermi gas in a magnetic trap. With a very small fraction of thermal atoms, the 7Li condensate is quasi-pure and in thermal contact with a 6Li Fermi gas. The lowest common temperature is 0.28 muK = 0.2(1) T_C = 0.2(1) T_F where T_C is the BEC critical temperature and T_F the Fermi temperature. Behaving as an ideal gas in the radial trap dimension, the condensate is one-dimensional.

cond-mat.stat-mech↗

arXiv2000

Sympathetic cooling of bosonic and fermionic Lithium gases towards quantum degeneracy

Sympathetic cooling of two atomic isotopes is experimentally investigated. Using forced evaporation of a bosonic 7Li gas in a magnetic trap, a sample of 3 10^5 6Li fermions has been sympathetically cooled to 9(3)muK, corresponding to 2.2(0.8) times the Fermi temperature. The measured rate constant for 2-body inelastic collisions of 7Li |2,2> state at low magnetic field is 1.0^{+0.8}_{-0.5} 10^-14 cm^3s^-1.

cond-mat↗