High-energy nanosecond radially polarized beam output from Nd:YAG amplifiers

Chang, Chengcheng; Cui, Xudong

doi:10.1007/s10043-017-0319-x

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…To compare quantificationally, the parameters, such as near field intensity, beam aperture, and numerical aperture of lens, are set to the same value for the two cases. Substitute equations ( 10) and (11) in equation ( 7) respectively, and under the conditions of λ 0 = 1053 nm, NA = 0.6, E 0 = 1, w 0 = 165 mm, N = 10 and β = 0.9, we get the characteristics of the LEF in the far field.…”

Section: Numerical Simulation Resultsmentioning

confidence: 99%

“…gratings [8], polarization selective mirrors [9] or few-mode fiber Bragg gratings [10] inside the cavity. This method can only obtain low peak power RPLB and the highest peak power generated until now is 77.2 MW [11], corresponding to a maximum LEF of 1.18 × 10 10 V m −1 at focal plane under 0.6 numerical aperture focusing. The other method is the extracavity method which directly transforms a linearly polarized laser beam into a RPLB outside a laser cavity by using spatial light modulators [12], multi sectors λ/2 wave plates [13,14], diffractive optical elements [15,16] or interferometric systems [17].…”

Section: Introductionmentioning

confidence: 98%

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Generation of super strong longitudinal electric field via vector superposition of linearly polarized laser beams

Zhang¹,

Zong-zhi²,

Jin³

et al. 2021

Laser Phys.

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Radially polarized laser beams, which could generate longitudinal electric fields (LEF) in the far field after being focused have drawn increasing interest in wide fields. However, it is difficult to boost a radially polarized laser pulse to high peak power due to its spatially inhomogeneous polarization distribution. Here, we propose a vector superposition approach, firstly partition a linearly polarized beam into two parts in the near field, secondly modulate their polarization direction separately using the electro-optical effect and finally focus them using a high numerical aperture lens, thereby generating the LEF in the far field owing to vector superposition. This approach can amplify a laser pulse to the required peak power by using traditional schemes of the linearly polarized seed-pulse generation and multi-pass amplification, thereby efficiently scaling the LEF to the required magnitude. The simulation results support the theory in concluding that the approach would be a competent way to achieve super strong LEF in the far field of a laser beam.

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Section: Numerical Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Generation of super strong longitudinal electric field via vector superposition of linearly polarized laser beams

Zhang¹,

Zong-zhi²,

Jin³

et al. 2021

Laser Phys.

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“…Exceptions to this would be the high‐power vector modes, for example, from disk lasers and fiber lasers, reaching up to 1.2 GW of peak power and 3 kW in average power, respectively. The use of new materials, including metasurfaces, could overcome this limitation in the future and have been suggested as a means to structuring light, but more likely is the need for structured light amplifiers, a topic that is only recently starting to received attention . Here the challenge is twofold: 1) to ensure a sufficiently uniform gain so that the spatially structured amplified is not restructured by gain and 2) to ensure that thermal effects do not alter the structured phase by imparting global aberrations on the wavefront.…”

Section: Discussionmentioning

confidence: 99%

Structured Light from Lasers

Forbes

2019

Laser & Photonics Reviews

247

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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“…Amongst these are examples of using structured pump light [70,71] to control the fundamental mode of the laser, thus potentially imparting a structured thermal gradient in the gain medium. In addition, there has been a move more recently towards higher powers with such structured light, either directly from the source [72][73][74][75][76][77] or by subsequent amplification [78][79][80][81][82][83]. Yet the impact of the structure of the light on the thermally induced effects has hitherto been neglected, as has the impact of the thermally induced phases and polarisation effects on the structure of the beam itself.…”

Section: Introductionmentioning

confidence: 99%

Thermal aberrations and structured light I: analytical model for structured pumps and probes

Scholes

Forbes

2021

Appl. Phys. B

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Structured light, where optical beams are tailored in amplitude, phase and polarisation to some desired profile, has become topical of late, fuelled by the ease at which such fields can be created internal and external to the source. In this treatise, part I of a two part series, we consider the thermal effects (stress, lensing and phase aberrations) associated with high-power structured light, where the structure may be the pump, optically inducing the thermal effects in the medium, or the probe, experiencing thermally induced optical aberrations. We outline a general theory for arbitrary structured light pumps and probes, reducing to the prior studies of Gaussian and flat-top beams as special cases. We illustrate the power of the model using the structure of light as a new degree of freedom with which to mitigate thermally induced optical aberrations. Finally, in part II of this composite work (Scholes and Forbes, Appl Phys B, 2021.

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High-energy nanosecond radially polarized beam output from Nd:YAG amplifiers

Cited by 7 publications

References 25 publications

Generation of super strong longitudinal electric field via vector superposition of linearly polarized laser beams

Generation of super strong longitudinal electric field via vector superposition of linearly polarized laser beams

Structured Light from Lasers

Thermal aberrations and structured light I: analytical model for structured pumps and probes

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