Laser Resonators and the Beam Divergence Problem

Anan'ev, Yurii A.

doi:10.1201/9781003062899

Cited by 22 publications

(8 citation statements)

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“…To explain this, we refer to the results obtained in [27][28][29], which demonstrate the influence of intracavity scattering on laser generation. Later results [27][28][29] were summarized in a monograph [30]. A short explanation, based on [30], is provided below.…”

Section: The Influence Of Pump Fluence Distribution On Ti:sapphire Laser Operationmentioning

confidence: 99%

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Engineering of Ti:Sapphire Lasers for Dermatology and Aesthetic Medicine

Tarasov¹,

Chu²

2021

Applied Sciences

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This review describes new engineering solutions for Ti:Sapphire lasers obtained at Laseroptek during the development of laser devices for dermatology and aesthetic medicine. The first device, PALLAS, produces 311 nm radiation by the third harmonic generation of a Ti:Sapphire laser, which possesses similar characteristics to excimer laser-based medical devices for skin treatments. In comparison to excimer lasers, Ti:Sapphire laser services are less expensive, which can save ~10% per year for customers compared to initial excimer laser costs. Here, the required characteristics were obtained due to the application of a new type of diffraction grating for spectral selection. The second device, HELIOS-4, based on the Ti:Sapphire laser, produces 300 mJ, 0.5 ns pulses at 785 nm for tattoo removal. The characteristics of HELIOS-4 exceed those of other tattoo removal laser devices represented in the medical market, despite a simple and inexpensive technical solution. The development of the last laser required the detailed study of a generation process and the investigation of the factors responsible for the synchronization of the generation in Ti:Sapphire lasers with short (several millimeters) cavities. The mechanism that can explain the synchronization in such lasers is suggested. Experiments for the confirmation of this concept are conducted and analyzed.

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Section: The Influence Of Pump Fluence Distribution On Ti:sapphire Laser Operationmentioning

confidence: 99%

“…Later results [27][28][29] were summarized in a monograph [30]. A short explanation, based on [30], is provided below.…”

Section: The Influence Of Pump Fluence Distribution On Ti:sapphire Laser Operationmentioning

confidence: 99%

Engineering of Ti:Sapphire Lasers for Dermatology and Aesthetic Medicine

Tarasov¹,

Chu²

2021

Applied Sciences

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“…Any spatial variation in the Stokes radiation intensity would reduce 1/A eff . In stable spherical cavities with a large Fresnel number, the generation of high-order Gaussian (Laguerre-Hermite) modes predominates [10,12], resulting in less overlap with the pump radiation and a lower conversion efficiency.…”

Section: Energy Characteristicsmentioning

confidence: 99%

Impact of Laser Cavity Configurations and Pump Radiation Parameters on the Characteristics of High-Energy Yellow Raman Lasers Based on Potassium Gadolinium Tungstate Crystals

Tarasov,

Chu

2024

Applied Sciences

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In this paper, the influence of pump radiation parameters and laser resonator configurations on the characteristics of high-energy 589 nm KGW Raman lasers is investigated and explained. The best energy efficiency is obtained in lasers with a flat resonator, while the best angular characteristics are obtained in lasers with an unstable resonator. The use of stable spherical resonators results in the worst energy and angular characteristics. The angular divergence in lasers with flat cavities increases with pump intensity because of wing growth, whereas the core width remains unchanged. The structure of the wings is recorded and analyzed.

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“…are the 'partial' WFs of the orthogonal field components (3), p = e x p x + e y p y is the spatial frequency vector characterizing directions of the plane-wave components of angular spectrum [1,3,5,61] of the beam (1), ( 2). In the geometric-optics limit (k → ∞), when the WF reduces to the ray intensity [62], p x and p y become angular ray coordinates [6] of rays composing the beam.…”

Section: Wigner Functionmentioning

confidence: 99%

“…Paraxial light fields are distinguished by the existence of physically selected longitudinal direction, along which the field spatial properties change much more slowly than in the orthogonal-transverse-directions [1][2][3][4][5][6]. In compliance with this notion and related ideas, the structure and properties of such fields are generally characterized via the field distributions at certain transverse cross sections, and the dependence on the longitudinal coordinate z is usually considered separately from the dependences on transverse ones x, y.…”

Section: Introductionmentioning

confidence: 99%

Geometric spin Hall effect and polarization-dependent transformations in the oblique section of a paraxial light beam

Bekshaev

Ternovsky

2023

Phys. Scr.

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The spatial structure of light beams is usually considered in the transverse cross sections but supplementary analysis of the field pattern across an oblique plane may disclose additional details of the internal beam structure and energy flow distributions. Their manifestations are known as “geometric spin Hall effect of light” (gSHEL). We analyze the “practical” gSHEL scheme in which the light energy distribution is registered by a detector whose input plane is inclined with respect to the propagation axis. Based on the vector beam model and using the formalism of optical Wigner matrices, we find that the oblique-plane energy distribution differs from that observed in the transverse cross section. This difference is associated with the azimuthal energy circulation and the orbital angular momentum (AM) of the beam; it can be expressed as the lateral shift of the mean-weighted beam position (beam centroid). The similar effect can be observed in elliptically polarized beams without orbital AM: there, the oblique-section projection reveals a specific asymmetry induced by the spin AM in the longitudinal field components of such beams. The polarization-induced oblique-section beam shift is rather weak in paraxial approximation but can be observable if the light-detecting procedure is selectively sensitive to the longitudinal optical-field component.

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Laser Resonators and the Beam Divergence Problem

Cited by 22 publications

References 0 publications

Engineering of Ti:Sapphire Lasers for Dermatology and Aesthetic Medicine

Engineering of Ti:Sapphire Lasers for Dermatology and Aesthetic Medicine

Impact of Laser Cavity Configurations and Pump Radiation Parameters on the Characteristics of High-Energy Yellow Raman Lasers Based on Potassium Gadolinium Tungstate Crystals

Geometric spin Hall effect and polarization-dependent transformations in the oblique section of a paraxial light beam

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