Controlling mode locking in optical ring cavities

Krenz, Gordon; Bux, Simone; Slama, Sebastian; Zimmermann, C.; Courteille, Ph. W.

doi:10.1007/s00340-007-2632-8

Cited by 19 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this way the atoms are repelled from the intensity maxima, which contributes to reducing radiation pressure. The spectrometer presented in this work, together with a recently developed method to actively control backscattering from imperfections at the mirrors' surfaces [23] will become important for future studies of collective dynamics in the regime of very weak coupling forces, where quantum effects are expected to play a role [11,10]. This work has been supported by the Deutsche Forschungsgemeinschaft (DFG) under Contract No.…”

Section: Resultsmentioning

confidence: 99%

Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure

et al. 2007

Self Cite

View full text Add to dashboard Cite

The combination of ultra-cold atomic clouds with the light fields of optical cavities provides a powerful model system for the development of new types of laser cooling and for studying cooperative phenomena. These experiments critically depend on the precise tuning of an incident pump laser with respect to a cavity resonance. Here, we present a simple and reliable experimental tuning scheme based on a two-mode laser spectrometer. The scheme uses a first laser for probing higher-order transversal modes of the cavity having an intensity minimum near the cavity's optical axis, where the atoms are confined by a magnetic trap. In this way the cavity resonance is observed without exposing the atoms to unwanted radiation pressure. A second laser, which is phase-locked to the first one and tuned close to a fundamental cavity mode drives the coherent atom-field dynamics.

show abstract

Section: Resultsmentioning

confidence: 99%

Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…A more effective general solution is to actively control the reverse mode by pumping it with a field of independently controllable amplitude and phase. [37]. Bidirectional pumping capability is desirable in any case, and so we chose to split off part of the power in the forward pump beam to inject into the reverse mode.…”

Section: Fig 5 Absorption Image Of 10 7mentioning

confidence: 99%

Monolithic bowtie cavity traps for ultracold gases

Cai¹,

Allman²,

Evans³

et al. 2020

J. Opt. Soc. Am. B

View full text Add to dashboard Cite

We report on trapping and cooling 6 Li atoms in a monolithic ring bowtie cavity. To make the cavity insensitive to magnetic fields used to tune atomic interactions, we constructed it entirely from fused silica and Zerodur. The components were assembled using hydroxide bonding, which we show can be compatible with ultra-high vacuum. Backscattering in high-finesse ring cavities readily causes trap intensity fluctuations and heating, but with phase-controlled bi-directional pumping the trap lifetime can be made long enough for quantum gas experiments in both the crossed-beam trap (unidirectional pump) and 2D lattice trap (bidirectional pump) configurations.

show abstract

“…In addition, it should be mentioned that for the experimental observation of spin-orbit coupling in this system, the backscattering into the same mode due to imperfections of the cavity mirrors, has to be small. This can be achieved by either choosing an optimized cavity geometry or via an additional light field which destructively interferes with the backscattered light [68].…”

Section: Atomic Momentum Distributions and Cavity-induced Spin-orbit mentioning

confidence: 99%

Cavity-induced emergent topological spin textures in a Bose–Einstein condensate

et al. 2019

View full text Add to dashboard Cite

The coupled nonlinear dynamics of ultracold quantum matter and electromagnetic field modes in an optical resonator exhibits a wealth of intriguing collective phenomena. Here we study a Λ-type, threecomponent Bose-Einstein condensate coupled to four dynamical running-wave modes of a ring cavity, where only two of the modes are externally pumped. However, the unpumped modes play a crucial role in the dynamics of the system due to coherent backscattering of photons. On a mean-field level we identify three fundamentally different steady-state phases with distinct characteristics in the density and spatial spin textures: a combined density and spin-wave, a continuous spin spiral with a homogeneous density, and a spin spiral with a modulated density. The spin-spiral states, which are topological, are intimately related to cavity-induced spin-orbit coupling emerging beyond a critical pump power. The topologically trivial density-wave-spin-wave state has the characteristics of a supersolid with two broken continuous symmetries. The transitions between different phases are either simultaneously topological and first-order, or second-order. The proposed setup allows the simulation of intriguing many-body quantum phenomena by solely tuning the pump amplitudes and frequencies, with the cavity output fields serving as a built-in nondestructive observation tool. New J. Phys. 21 (2019) 013029 S Ostermann et al *

show abstract

Controlling mode locking in optical ring cavities

Cited by 19 publications

References 14 publications

Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure

Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure

Monolithic bowtie cavity traps for ultracold gases

Cavity-induced emergent topological spin textures in a Bose–Einstein condensate

Contact Info

Product

Resources

About