Emission of a propagation invariant flat-top beam from a microchip laser

Naidoo, Darryl; Harfouche, A.; Fromager, Michaël; Aı̈t-Ameur, Kamel; Forbes, Andrew

doi:10.1016/j.jlumin.2015.09.035

Cited by 19 publications

(9 citation statements)

References 28 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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“…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. Using gain control approaches, many forms of structured light have been realized . In many of these examples, external structured light was used to enhance intracavity creation of structured light.…”

Section: Structured Light Lasersmentioning

confidence: 99%

“…An obvious case of vector vortex beams is the generation of radially and azimuthally polarized beams, particularly from fiber lasers . Once again, many approaches have been explored to create such modes including radially polarized LG modes by annular pumping, radially polarized arbitrary structured ring and arc beams with an intracavity axicon, as shown in Figure , and vector flat‐top beams …”

Section: Structured Light Lasersmentioning

confidence: 99%

Structured Light from Lasers

Forbes

2019

Laser & Photonics Reviews

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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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“…Lasing optical spectra were measured by a multiwavelength meter (HP-86120B; wavelength range, 700-1650 nm) for obtaining global views and a scanning Fabry-Perot interferometer (SFPI) (Burleigh SA PLUS ; 2 GHz free spectral range; 6.6 MHz resolution) for measuring detailed structures. In the case of TS 3 Ls and monolithic microchip solidstate lasers [11,15,16], the input-output characteristics and the transverse and longitudinal mode oscillation properties depend on the focusing condition of the pump beam on the crystal due to the mode-matching between the pump and lasing mode profiles. In the present experiment, the pumpbeam diameter was changed by shifting the laser crystal along the z-axis, as depicted in Figure 1 When the laser crystal was adjusted to the pump-beam focus position, i.e.…”

Section: Stationary Characteristics Of Dual-polarization Oscillationsmentioning

confidence: 99%

Dynamic characterization of beating sinusoidal wave oscillations in a thin-slice solid-state laser with coupled orthogonally polarized transverse modes

Otsuka¹

2019

Laser Phys. Lett.

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Dynamic characterization of self-induced beating sinusoidal wave (BSW) oscillations and related phenomena, which were previously explored in a thin-slice dualpolarization solid-state laser operating in the regime of incomplete mode-locking of orthogonally polarized transverse eigenmodes, namely, a quasi-locked state [Laser Physics Letters, 15 (2018) 075001], is performed in terms of the amplitude correlation coefficient and intensity circulation among various orthogonally polarized mode pairs. Polarization-dependent symmetry-breaking featuring a nonreciprocal intensity flow for different orthogonally polarized mode pairs operating in the BSW state are found. The singular state is hidden in a nonlinear system where a perfect mode-locked BSW state with a large amplitude correlation coefficient featuring reciprocal intensity flow is established for a transverse mode pair possessing particular polarization directions that are related to the intensity ratio of orthogonally polarized transverse eigenmodes. Self-organized chaos synchronization is shown to take place for such a singular transverse mode pair subjected to self-mixing modulations.

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Emission of a propagation invariant flat-top beam from a microchip laser

Cited by 19 publications

References 28 publications

Brightness enhancement in a solid-state laser by mode transformation

Brightness enhancement in a solid-state laser by mode transformation

Structured Light from Lasers

Dynamic characterization of beating sinusoidal wave oscillations in a thin-slice solid-state laser with coupled orthogonally polarized transverse modes

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