Athreya Shankar
University of Colorado Boulder
Synchronization (computer science)Phase (waves)OpticsPhysicsElectromagnetically induced transparencyKinetic energyLaser linewidthPenning trapIonTransverse planeAtomic physicsOptical cavityMaterials scienceAtomic beamNormal modeSuperradianceMolecular physicsLaserQuantum mechanicsGround stateSpin-½QuantumPotential energySteady state (electronics)
32Publications
7H-index
101Citations
Publications 28
Newest
#1Simon B. JägerH-Index: 8
#2Haonan LiuH-Index: 2
Last. Murray HollandH-Index: 46
view all 5 authors...
#1Haonan LiuH-Index: 2
#2Simon B. JägerH-Index: 8
Last. Murray HollandH-Index: 46
view all 7 authors...
#1Chen TangH-Index: 3
#2Athreya ShankarH-Index: 7
Last. Scott ParkerH-Index: 30
view all 6 authors...
Planar thermal equilibration is studied using direct numerical simulations of ultracold two-dimensional (2D) ion crystals in a Penning trap with a rotating wall. The large magnetic field of the trap splits the modes that describe in-plane motion of the ions into two branches: High frequency cyclotron modes dominated by kinetic energy and low frequency \mathbf{E \times B}modes dominated by potential energy associated with thermal position displacements. Using an eigenmode analysis we extract t...
Source
#1Athreya ShankarH-Index: 7
#2Jarrod T. ReillyH-Index: 2
Last. Murray HollandH-Index: 46
view all 4 authors...
We show that the onset of steady-state superradiance in a bad cavity laser is preceded by a dissipative phase transition between two distinct phases of steady-state subradiance. The transition is marked by a non-analytic behavior of the cavity output power and the mean atomic inversion, as well as a discontinuity in the variance of the collective atomic inversion. In particular, for repump rates below a critical value, the cavity output power is strongly suppressed and does not increase with the...
2 CitationsSource
#1Simon B. Jäger (CU: University of Colorado Boulder)H-Index: 8
#2Haonan Liu (CU: University of Colorado Boulder)H-Index: 2
Last. Murray Holland (CU: University of Colorado Boulder)H-Index: 46
view all 5 authors...
We investigate the different photon emission regimes created by a pre-excited and collimated atomic beam passing through a single mode of an optical cavity. In the regime where the cavity degrees of freedom can be adiabatically eliminated, we find that the atoms undergo superradiant emission when the collective linewidth exceeds the transit-time broadening. We analyze the case where the atomic beam direction is slanted with respect to the cavity axis. For this situation, we find that a phase of ...
4 CitationsSource
#1Haonan LiuH-Index: 2
#2Simon B. Jäger (NIST: National Institute of Standards and Technology)H-Index: 8
Last. Travis Nicholson (NUS: National University of Singapore)H-Index: 10
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We propose a new type of superradiant laser based on a hot atomic beam traversing an optical cavity. We show that the theoretical minimum linewidth and maximum power are competitive with the best ultracoherent clock lasers. Also, our system operates naturally in continuous wave mode, which has been elusive for superradiant lasers so far. Unlike existing ultracoherent lasers, our design is simple and rugged. This makes it a candidate for the first widely accessible ultracoherent laser, as well as...
9 CitationsSource
#1Athreya ShankarH-Index: 7
#2Chen TangH-Index: 3
Last. John J. BollingerH-Index: 57
view all 8 authors...
The authors theoretically and numerically investigate the in-plane motion of two-dimensional ion crystals stored in Penning traps. They find that the thermal fluctuations in the in-plane positions of ions, described by normal modes whose potential energy is several hundred times larger than their kinetic energy, strongly contribute to the spectral broadening of the transverse drumhead motion.
5 CitationsSource
#1Haonan LiuH-Index: 2
#2Simon B. JägerH-Index: 8
Last. Travis NicholsonH-Index: 10
view all 7 authors...
We propose a steady-state, ultracoherent laser based on superradiance from a hot atomic beam traversing an optical cavity. Our design is considerably simpler than existing ultrastable lasers due to its uncomplicated atomic source and straightforward cavity. Nevertheless, its minimum linewidth and maximum output power are competitive with the best narrow-linewidth light sources. We show that, because of atomic phase synchronization, the phase of the output light is robust against decoherence aris...
#1Simon B. JägerH-Index: 8
#2Haonan LiuH-Index: 2
Last. Murray HollandH-Index: 46
view all 5 authors...
We investigate the different emission regimes of a pre-excited and collimated atomic beam passing through an optical cavity. In the regime where the cavity degrees of freedom can be adiabatically eliminated, we find that the atoms undergo superradiant emission if the collective linewidth exceeds transit-time broadening. We analyze the case where the atomic beam is not precisely perpendicular to the cavity axis and find a phase of continuous light emission similar to steady-state superradiance fo...