Beam shaping laser with controllable gain

Litvin, Igor A.; King, Gary; Strauss, H. J.

doi:10.1007/s00340-017-6747-2

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…There are several design configurations available that consider either low or higher order mode selection [13][14][15][16][17][18][19], and particular to the selection of flattop beams (FTBs) for increased energy extraction and single-mode operation, there are several phase-only approaches that include the use of diffractive mirrors [20], graded-phase mirrors [21,22], diffractive elements [23], and intra-cavity deformable mirrors [24][25][26][27][28][29]. Other approaches include an intra-cavity amplitude filter [30], manipulation of the gain profile [31], an intra-cavity variable reflectivity mirror [32], and employing optical feedback in a microchip laser [33]. With many of these approaches, an obvious step in realizing high brightness in solid-state lasers is through increasing the output laser power by scaling up the input pump power.…”

Section: Introductionmentioning

confidence: 99%

Brightness enhancement in a solid-state laser by mode transformation

Naidoo¹,

Litvin²,

Forbes³

2018

Optica

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Laser brightness is a measure of the ability to deliver intense light to a target and encapsulates both the energy content and the beam quality. High-brightness lasers require that both parameters be maximized, yet standard laser cavities do not allow this. For example, multimode beams, a mix of many transverse modes, have a high energy content but low beam quality, while single transverse mode Gaussian beams have a good beam quality, but their small mode volume means a low energy extraction. Here we overcome this fundamental limitation and demonstrate an optimal approach to realizing high-brightness lasers. We employ intra-cavity beam shaping to produce a single transverse mode that changes profile inside the cavity, Gaussian at the output end and flattop at the gain end, such that both energy extraction and beam quality are simultaneously optimized. This work should have a significant influence on the design of future high-brightness laser cavities.

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Section: Introductionmentioning

confidence: 99%

Brightness enhancement in a solid-state laser by mode transformation

Naidoo¹,

Litvin²,

Forbes³

2018

Optica

Self Cite

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“…By the manipulation of output powers, it is possible to get controllable beam shaping for the output intensity profile. The experiment proving this concept is shown by Litvin et al [39] in 2017.…”

Section: Laser Beam Propagationmentioning

confidence: 88%

Review on mechanism and process of surface polishing using lasers

2019

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Laser polishing is a technology of smoothening the surface of various materials with highly intense laser beams. When these beams impact on the material surface to be polished, the surface starts to be melted due to the high temperature. The melted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surface tension. By varying the process parameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surface roughness can be achieved. High precision polishing of surfaces can be done using laser process. Currently, laser polishing has extended its applications from photonics to molds as well as bio-medical sectors. Conventional polishing techniques have many drawbacks such as less capability of polishing freeform surfaces, environmental pollution, long processing time, and health hazards for the operators. Laser polishing on the other hand eliminates all the mentioned drawbacks and comes as a promising technology that can be relied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface. Majority of the researchers performed laser polishing on materials such as steel, titanium, and its alloys because of its low cost and reliability. This article gives a detailed overview of the laser polishing mechanism by explaining various process parameters briefly to get a better understanding about the entire polishing process. The advantages and applications are also explained clearly to have a good knowledge about the importance of laser polishing in the future.

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“…Rather than using amplitude and phase, both of which are lossy (practical phase‐only elements always have some efficiency issues), it is also possible to exploit gain shaping for selecting structured light modes. This can be accomplished by shaping the pump light to shape the spatial gain profile, perhaps to make it more uniform or to deliberately structure it spatially, or by adjusting the distribution of active ions in solid‐state media . Such techniques are particularly well‐suited to microchip lasers where it is not possible to insert any amplitude or phase elements into the cavity due to the monolithic design.…”

Section: Structured Light Lasersmentioning

confidence: 99%

Structured Light from Lasers

Forbes

2019

Laser & Photonics Reviews

248

126

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Structured light is derived from the ability to tailor light, usually referring to the spatial control of its amplitude, phase, and polarization. Although a venerable topic that dates back to the very first laser designs, structuring light at the source has seen an explosion in activity over the past decade, fuelled by a modern toolkit that exploits the versatility of diffractive structures, liquid crystals, metasurfaces/metamaterials, and exotic laser geometries, as well as a myriad of applications that range from imaging, microscopy, and laser material processing to optical communication. Here, the recent progress in creating and controlling structured light is reviewed, with particular emphasis on structuring light at the source: structured light lasers. The various design approaches, including pump shaping, cavity geometries, and the use of custom intracavity optical elements, implemented in a variety of lasers from microchip solutions to high‐power fibers are covered in a tutorial style. The history and latest developments in the field are reviewed, elucidating the various structured light patterns that have been created from lasers, including orbital angular momentum and vector states of light. Finally, the present challenges and limitations are highlighted, along with comments on likely future trends.

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Beam shaping laser with controllable gain

Cited by 18 publications

References 17 publications

Brightness enhancement in a solid-state laser by mode transformation

Brightness enhancement in a solid-state laser by mode transformation

Review on mechanism and process of surface polishing using lasers

Structured Light from Lasers

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