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

Калашников, В. Л.; Krimer, Dmitry O.; Mejid, F.; Poloiko, I G; Mikhailov, V. P.

doi:10.1070/qe1999v029n04abeh001480

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…As shown in [15], a factor of primary importance impeding USP generation is the modulation instability of a laser pulse. To estimate the modulation instability, we use the aberration-free approximation, which assumes the possibility of variation of USP parameters, with its shape being unchanged.…”

Section: Modelmentioning

confidence: 99%

Theory of generation of sub-10-fs pulses in a cw solid-state laser with a semiconductor passive switch and self-focusing under coherent-interaction conditions

Калашников¹,

Krimer²,

Poloiko³

2000

Quantum Electron.

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A brief review of established methods shows that only with the Berthelot technique is it possible to see a finite volume of liquid in sustained mechanical tension. A short discussion of the practice and theory reveals two uncertainties with the conventional technique : that of the determination of a true filling temperature, and the influence of compliance by the glass on the tension developed. A description is then given of a modified apparatus with which these difficulties do not arise. The tube is formed into a coil which deflects sufficiently to indicate internal pressure or tension, and by monitoring these deflections with a distance meter a record of pressure/ tension against temperature can be made. The course of a typical run is shown from which the excess pressure, filling temperature and limiting tension may all be estimated with much greater precision than befoie. The orders of magnitude of the results obtained are indicated, and a possible influence of non-uniform gaseous supersaturation is suggested.

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Section: Modelmentioning

confidence: 99%

Theory of generation of sub-10-fs pulses in a cw solid-state laser with a semiconductor passive switch and self-focusing under coherent-interaction conditions

Калашников¹,

Krimer²,

Poloiko³

2000

Quantum Electron.

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“…It is also known [4] that certain solid-state lasers can generate a regular sequence of fairly short pulses on excitation of relaxation oscillations in them at a fairly low external modulation of the pumping level or the cavity Q factor [5]. The physical processes occurring in the cavities of cw solid-state lasers emitting ultrashort pulses were investigated in [6,7] on the basis of simulation and comprehensive analysis of the operation of saturable Q switches based on semiconductor structures.…”

Section: Introductionmentioning

confidence: 99%

Self-pulsations of radiation in a solid-state laser with a nonlinear thin-film Q switch

Glazunova

Yurevich

2005

J Appl Spectrosc

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The conditions for realization of the regime of self-oscillations of the intensity of a continuously pumped solid-state laser have been qualitatively analyzed using a system of kinetic equations. It has been established that, in the case where a thin semiconductor layer absorbing light at frequencies close to the lasing frequency is placed into the cavity of such a laser, self-oscillations of its radiation intensity arise as a result of the amplitude-phase self-modulation of the laser light field.Keywords: relaxation dynamics of lasers, intracavity self-modulation of radiation, self-modulation broadening of the amplification line.Introduction. Lasers emitting a continuous sequence of short pulses are used in metrology and modern apparatus for transmission of information. Generation of stable trains of contrasting subpicosecond-and picosecond light pulses calls for top laser technologies. Currently, planar semiconductor structures have come into use as passive Q switches in solid-state lasers generating ultrashort pulses in the regime of mode locking [1][2][3]. It is also known [4] that certain solid-state lasers can generate a regular sequence of fairly short pulses on excitation of relaxation oscillations in them at a fairly low external modulation of the pumping level or the cavity Q factor [5]. The physical processes occurring in the cavities of cw solid-state lasers emitting ultrashort pulses were investigated in [6, 7] on the basis of simulation and comprehensive analysis of the operation of saturable Q switches based on semiconductor structures.Formulation of the Problem. The aim of the present work is to determine the range of parameters of a solid-state laser with a thin-film passive Q switch at which in it there arise self-oscillations of its light intensity. Such a laser begins to operate in the regime of intracavity self-Q-switching on excitation of relaxation oscillations in it as a result of the change in the effective transmission of its Q switch caused by the change in the radiation intensity. However, the transmission of a semiconductor Q switch can change not only as a result of the saturated absorption of light in its material, but also due to the high criticality of the very thin layer of this material to the variations in the frequency of oscillations in the cavity. Such variations in the frequency of oscillations can arise in active media characterized by a complex structure of amplification. In the case of a complex profile of the amplification band, even the detuning of the maximum lasing frequency from the fundamental frequency of the active transition can be nonzero. It has been established in [8,9] that the refractive index of semiconductors and activated crystals changes resonantly depending on the magnitude and sign of such a detuning. Under these conditions, the dynamics of laser radiation depends on the self-modulation broadening of the amplification line and on the relation between the amplitude and phase of the radiation pulses. In [10], it was established that self-modulation chan...

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

Cited by 2 publications

References 11 publications

Theory of generation of sub-10-fs pulses in a cw solid-state laser with a semiconductor passive switch and self-focusing under coherent-interaction conditions

Theory of generation of sub-10-fs pulses in a cw solid-state laser with a semiconductor passive switch and self-focusing under coherent-interaction conditions

Self-pulsations of radiation in a solid-state laser with a nonlinear thin-film Q switch

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