Haonan Liu

University of Colorado Boulder

Collective behaviorResonanceSpontaneous emissionUltracold atomMaximum power principlePhase (waves)OpticsPhysicsLaser linewidthPhase transitionBeam (structure)DipoleAmplitudeSingle-mode optical fiberAtomic physicsOptical cavityMaterials scienceBeam laserAtomic beamCollimated lightSuperradianceMonochromatic colorDephasingLaserDisplacement (vector)Dynamics (mechanics)Non-equilibrium thermodynamicsSteady state (electronics)BistabilityContinuous wave

11Publications

2H-index

12Citations

Publications 11

#1Simon B. JägerH-Index: 8

#2Haonan LiuH-Index: 2

Last. Murray HollandH-Index: 46

view all 4 authors...

We study the collective emission of a beam of atomic dipoles into an optical cavity. Our focus lies on the effect of a finite detuning between the atomic transition frequency and the cavity resonance frequency. By developing a theoretical description of the coupled atom-cavity dynamics we analyze the stationary atomic configurations including a superradiant phase where the atoms undergo continuous monochromatic collective emission. In addition, we derive an analytical formula for the cavity pull...

#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...

#1Simon B. JägerH-Index: 8

#2Haonan LiuH-Index: 2

Last. Murray HollandH-Index: 46

view all 5 authors...

We theoretically analyze the collective dynamics of a thermal beam of atomic dipoles that couple to a single mode when traversing an optical cavity. For this setup we derive a semiclassical model and determine the onset of superradiant emission and its stability. We derive analytical expressions for the linewidth of the emitted light and compare them with numerical simulations. In addition, we find and predict two different superradiant phases; a steady-state superradiant phase and a multi-compo...

Regular and bistable steady-state superradiant phases of an atomic beam traversing an optical cavity

#1Simon B. Jäger (CU: University of Colorado Boulder)H-Index: 2

#1Simon B. Jäger (CU: University of Colorado Boulder)H-Index: 8

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 ...

#1Haonan LiuH-Index: 2

#2Simon B. Jäger (NIST: National Institute of Standards and Technology)H-Index: 2

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...

#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...

#1Haonan LiuH-Index: 2

#2Simon B. JägerH-Index: 8

Last. Murray HollandH-Index: 46

view all 6 authors...

#1Liang-Ying ChihH-Index: 1

#2Athreya ShankarH-Index: 7

Last. Murray HollandH-Index: 46

view all 5 authors...

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