Acoustical laser with mechanical pumping

Zavtrak, S. T.

doi:10.1121/1.414649

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…Classical laser designs [13][14][15][16][17][18][19] have been proposed but little has yet been realized in the laboratory. Here we report construction of nonlinear electronic oscillators coupled piezoelectrically to an elastic body and capable of both spontaneous and stimulated emission.…”

Section: Introductionmentioning

confidence: 99%

“…Laser oscillation is not necessarily a quantum phenomenon. Classical laser designs [1][2][3][4][5][6] have pedagogic value but no devices have yet been constructed, and the designs have played no role in laser research. Here we report construction of nonlinear classical oscillators in contact with an acoustic cavity and capable of both spontaneous and stimulated emission.…”

Section: Introductionmentioning

confidence: 99%

“…The sine-qua-non of a laser is stimulated emission, in which a wave incident upon an excited oscillator is re-emitted with unchanged phase and increased amplitude. It is perhaps not widely appreciated that stimulated emission is a classical phenomenon [1][2][3][4][5][6]. An excited classical linear oscillator will exhibit stimulated absorption or stimulated emission depending on the phase of the oscillator relative to that of the incident field.…”

Section: Introductionmentioning

confidence: 99%

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Entrainment and stimulated emission of ultrasonic piezoelectric auto-oscillators

Weaver

Lobkis

Yamilov

2007

The Journal of the Acoustical Society of America

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Theoretical modeling and laboratory tests are conducted for nonlinear auto-oscillating piezoelectric ultrasonic devices coupled to reverberant elastic bodies. The devices are shown to exhibit behavior familiar from the theory of coupled auto-oscillators. In particular, these spontaneously emitting devices adjust their limit-cycle frequency to the spectrum of the body. It is further shown that the auto-oscillations can be entrained by an applied field; an incident wave at a frequency close to the frequency of the natural limit cycle entrains the oscillator. Special attention is paid to the phase of entrainment. Depending on details, the phase is such that the oscillator can be in a state of stimulated emission: the incident field amplifies the ultrasonic power emitted by the oscillator. These behaviors are essential to eventual design of an ultrasonic system that would consist of a number of such devices all synchronized to their mutual field, a system that would be an analog to a laser. A prototype uaser is constructed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entrainment and stimulated emission of ultrasonic piezoelectric auto-oscillators

Weaver

Lobkis

Yamilov

2007

The Journal of the Acoustical Society of America

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“…Sasers are devices capable of producing beams of coherent phonons. Besides the system considered here, several other kinds of such devices were proposed and constructed [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Besides the system considered here, several other kinds of such devices were proposed and constructed [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The operation threshold of a double barrier phonon laser

Camps

Makler

2000

Solid State Communications

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We make an adaptation of laser modelling equations to describe the behavior of a phonon laser (saser). Our saser consists of an AlGaAs/GaAs double barrier heterostructure designed to generate an intense beam of transversal acoustic (T A) phonons. To study our system, we begin with a Hamiltonian that describes the decay of primary longitudinal optical phonons (LO 1 ) into secondary (LO 2 ) and T A (LO 1 → LO 2 + T A) and its inverse process (recombination). Using this Hamiltonian, a set of coupled equations of motion for the phonons is obtained. We also consider the interaction between the phonons and its reservoirs. These interactions are introduced in the equations of motion leading to a set of coupled Langevin equations. In order to obtain an expression to describe our saser we apply, in the Langevin equations, an adiabatic elimination of some variables of the subsystem. Following the method above we obtain the value of the injection threshold for the operation of our phonon laser. At this threshold occurs a phase transition from a disordered to a coherent state. It is shown that it is not necessary a big "optical" pumping to get a sasing region.

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A source of terahertz coherent phonons

Makler

Vasilevskiy²,

Anda

et al. 1998

J. Phys.: Condens. Matter

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Resonant tunnelling in a double-barrier heterostructure (DBHS) designed in order to produce an intense coherent emission of phonons is studied theoretically. This emission is achieved when the energy difference between the first excited level and the ground state in the well is close to the LO-phonon energy. The LO phonons emitted during the electron transition decay into a pair of (LO and TA) phonons that leave the well in the [111] direction. These secondary TA phonons are coherent and form a beam that we call a SASER (by analogy with 'laser'). The circulating current and the populations of phonons and electrons in the well are calculated by solving appropriate kinetic equations. Some possible applications of this system are discussed.

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Acoustical laser with mechanical pumping

Cited by 9 publications

References 3 publications

Entrainment and stimulated emission of ultrasonic piezoelectric auto-oscillators

Entrainment and stimulated emission of ultrasonic piezoelectric auto-oscillators

The operation threshold of a double barrier phonon laser

A source of terahertz coherent phonons

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