New principle of formation of ultrashort pulses in solid-state lasers with self-phase-modulation and gain saturation

Калашников, В. Л.; Kalosha, V. P.; Poloiko, I G; Mikhailov, V. P.

doi:10.1070/qe1996v026n03abeh000635

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The complex confinement potential in [15] corresponds to a cigar-like confining potential in a weakly-dissipative BEC (figure 1(a)) [16]. As it was previously found, an external periodical phase modulation can substantially enhance 1D-soliton stability in a dissipative laser system in the presence of Kerrnonlinearity [50][51][52][53][54]. As a rule, a periodic phase modulation (∝t 2 + H.O.T.)…”

Section: Introductionsupporting

confidence: 52%

Stabilization of spatiotemporal dissipative solitons in multimode fiber lasers by external phase modulation

Калашников¹,

Wabnitz²

2022

Laser Phys. Lett.

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In this work, we introduce a method for the stabilization of spatiotemporal (ST) solitons. These solitons correspond to light bullets in multimode optical fiber lasers, energy-scalable waveguide oscillators and amplifiers, localized coherent patterns in Bose–Einstein condensates, etc. We show that a three-dimensional confinement potential, formed by a spatial transverse (radial) parabolic graded refractive index and dissipation profile, in combination with quadratic temporal phase modulation, may permit the generation of stable ST dissipative solitons. This corresponds to combining phase mode-locking with the distributed Kerr-lens mode-locking. Our study of the soliton characteristics and stability is based on analytical and numerical solutions of the generalized dissipative Gross–Pitaevskii equation. This approach could lead to higher energy (or condensate mass) harvesting in coherent spatio-temporal beam structures formed in multimode fiber lasers, waveguide oscillators, and weakly-dissipative Bose–Einstein condensates.

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Section: Introductionsupporting

confidence: 52%

Stabilization of spatiotemporal dissipative solitons in multimode fiber lasers by external phase modulation

Калашников¹,

Wabnitz²

2022

Laser Phys. Lett.

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“…That is obviously connected to co-existence of nonlinearities with different time scales: instantaneous non-dissipative SPM, and non-instantaneous dissipative nonlinearities like stimulated Raman scattering (SRS), saturable absorber losses, and gain saturation. This issue is especially intriguing, as the dynamic gain saturation can provide a supplementary mechanism of DS formation [71].…”

Section: Main Obstacles To the Ds Energy Harvestingmentioning

confidence: 99%

Theory of Laser Energy Harvesting at Femtosecond Scale

Калашников¹

2018

High Power Laser Systems

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Energy scaling of femtosecond laser pulses has a lot of applications in nanoscale micromachining, precision time-resolution spectroscopy, high-harmonic generation, surgery, etc. Besides applied sciences and technology, there are fundamental applications of energy harvesting at femtosecond scale. In particular, it is possible to study and control intra-atom and molecular dynamics at attosecond level as well as to map the quantum processes directly with unprecedented spatial and temporal resolution. This "mesoscopic" union of classical and quantum phenomena provides with new insights into fundamental issues of quantum mechanics of open systems including possible application in the field of quantum computing. In this work, we consider a theory of femtosecond pulse energy harvesting using the dissipative soliton generation in both solid-state and fiber mode-locked lasers and the femtosecond pulse enhancement in an external resonator. The femtosecond pulse energy, width, and spectrum scaling laws are presented in the explicit and physically meaningful form.The second approach is based on the energy storing in an external high-Q resonator (so-called enhancement resonator, ER) coupled synchronously with a femtosecond pulse oscillator [26][27][28]. This simple idea faces difficulties when it is realized on a femtosecond scale because nonlinear effects and group-delay dispersion (GDD) tend to destroy a synchronization between a laser and ER. These issues will be outlined, and some modifications of ER technique will be proposed. DS energy scalingThe DS energy and width scaling are connected closely with a duality between amplification of the maximum number of laser modes and simultaneous spectral condensation, i.e., the concentration High Power Laser Systems

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“…[10], it reduces the total anomalous group-velocity dispersion and, consequently, increases the contribution of the higher-order dispersion (particularly the third-order contribution). For this reason we shall subtract the third-order dispersion, which can be done by introducing into Eqn (1) a perturbation term d 3 q 3 aaqt 3 (d 3 is the dimensionless coefficient of the third-order group-velocity dispersion) while retaining the shape of an ultrashort pulse ak, t a 0 sech t À Wk t p 1ic expfijk ot À Wkg , where 5 is the time delay of a pulse in a round trip through the cavity; o is the frequency detuning of a pulse from the centre of the pass band of a frequency-selective component [14]. The right-hand sides of the iteration relationships (4) must then be supplemented by the following terms:…”

mentioning

confidence: 99%

Self-oscillations in cw solid-state ultrashort-pulse-generating lasers with mode locking by self-focusing

Калашников¹,

Krimer²,

Mejid³

et al. 1999

Quantum Electron.

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New principle of formation of ultrashort pulses in solid-state lasers with self-phase-modulation and gain saturation

Cited by 5 publications

References 13 publications

Stabilization of spatiotemporal dissipative solitons in multimode fiber lasers by external phase modulation

Stabilization of spatiotemporal dissipative solitons in multimode fiber lasers by external phase modulation

Theory of Laser Energy Harvesting at Femtosecond Scale

Self-oscillations in cw solid-state ultrashort-pulse-generating lasers with mode locking by self-focusing

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