Dynamics of the operation of a fast-flow laser with inhomogeneous excitation of the active medium in an unstable cavity

Mushenkov, A V; Odintsov, A. I.; Sarkarov, N. E.; Fedoseev, A. I.; Fedyanovich, A V

doi:10.1070/qe1997v027n05abeh000957

Cited by 3 publications

(8 citation statements)

References 9 publications

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“…Under the conditions specified in the comments regarding figure 2, relation (7) is observed for the total perturbation ( )…”

Section: Analytical Modelmentioning

confidence: 99%

“…In the opposite case, for low-speed or external pumping, the amplitude of the edge perturbation at the axis ( ) g 0 2 exceeds the amplitude of the internal perturbation ( ) g 0 1 , and the feedback is predominantly created by the edge perturbation. In the general case, the complex increment Γ, which is determined from relation (7), is formed jointly by all three types of perturbation. At the same time, each perturbation in turn depends on Γ.…”

Section: Analytical Modelmentioning

confidence: 99%

“…Analyzing the vector diagrams of the perturbations (11) at the UC axis allows us to determine the resonant frequencies that correspond to the maximum increment values. As an example, figure 4 shows the scheme of the 'triple resonance' when the oscillation frequency Ω is close to the relaxation frequency Ω 0 and the phases of both flow perturbations ( ) g 0 As (7) predicts, the total amplitude of the gain perturbation at axis ( ) g 0 is approximately proportional to the oscillation frequency Ω. At the same time, as can be seen from ( 11), the amplitudes of the perturbation components ( ) g 0 0 , ( ) g 0 1 and ( ) g 0 2 decrease when the frequency increases.…”

Section: Analytical Modelmentioning

confidence: 99%

“…For example, the ruby laser active rod moving along the cavity axis modifies the lasing regime [1]. Gas lasers with a fast transverse flow of active medium through a resonator system may show instability and have various self-pulsing regimes, both regular and chaotic [2][3][4][5][6][7][8][9][10]. The mechanism of lasing instability is based on the feedback between different spatial parts of an optical cavity due to the medium motion.…”

Section: Introductionmentioning

confidence: 99%

“…This behavior is also addressed by the theory of nonlinear optical processes in a moving media. The practical interest of the phenomena is associated with the development of regime control methods that are applicable to powerful gas-flow lasers [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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The gradient waves of perturbations as an instability factor in fast-flow lasers

et al. 2016

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We study the mechanism of the self-oscillation instability associated with the nonlinear interaction of radiation with a moving active medium in a fast-flow gas laser. The results of our analytical and numerical calculations of the frequencies and increments of the small self-oscillation perturbations in an unstable cavity of the laser with a non-uniform pumping rate are presented. In the analytical model the small perturbations of the gain in each point of the flow consist of two parts. The first part includes the 'local' perturbations that are not related to a motion of the medium. The second part includes the 'flow' perturbations that arise upstream of the flow due to the gradients of the pumping rate and the laser field intensity. These perturbations are carried by the flow in the form of traveling waves. The interference of the 'gradient' waves of the flow perturbations results in the resonant properties of the feedback produced by the flow. It is demonstrated that it is feasible to control the lasing regime based on these resonant properties of the feedback. The simulation of the nonlinear lasing regimes demonstrates that the conversion of continuous lasing into the periodical self-pulsing regime is not accompanied by a significant reduction in the average power output.

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“…Under the conditions specified in the comments regarding figure 2, relation (7) is observed for the total perturbation ( )…”

Section: Analytical Modelmentioning

confidence: 99%

Section: Analytical Modelmentioning

confidence: 99%

Section: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The gradient waves of perturbations as an instability factor in fast-flow lasers

et al. 2016

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Chaotic lasing regimes in the unstable cavity of an inhomogeneously pumped fast-flow laser

Loskutov¹,

Mushenkov²,

Odintsov³

et al. 1999

Quantum Electron.

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Au-gated Pt field-emitter arrays (FEAs) were fabricated using focused ion and electron beams. The gate opening in Au layers was produced by physical sputtering using focused ion beams (FIBs) and subsequent wet etching of the underlying silicon dioxide layer. Deposition of a platinum pyramid-shaped emitter into the gate opening using electron beams (EBs) induced a chemical reaction producing field emission without any thermal annealing process. Pt emitters with different heights of a Au-gated field emitter array were studied. The electron emission currents are about 1 and 10 µA for the emitter tip heights of 570 and 760 nm, respectively. Consequently, the height of the emitter must be adjusted to the top surface of gate apertures for optimization of emission behavior.

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Self-oscillation perturbations in a fast-flow unstable resonator laser

Odintsov¹,

Sarkarov²,

Fedoseev³

2006

Quantum Electron.

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Dynamics of the operation of a fast-flow laser with inhomogeneous excitation of the active medium in an unstable cavity

Cited by 3 publications

References 9 publications

The gradient waves of perturbations as an instability factor in fast-flow lasers

The gradient waves of perturbations as an instability factor in fast-flow lasers

Chaotic lasing regimes in the unstable cavity of an inhomogeneously pumped fast-flow laser

Self-oscillation perturbations in a fast-flow unstable resonator laser

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