Flat-Top Line-Shaped Beam Shaping and System Design

Guo, Youming

doi:10.3390/s22114199

Cited by 14 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mathematical representation of a flat-top can also be approximated as a Lorentzian function [22], having a an outgoing uniform intensity over a radius, 𝑅𝑅 𝑂𝑂 : 𝐼𝐼(𝑅𝑅) 𝑓𝑓𝑓𝑓𝑠𝑠𝑓𝑓−𝑓𝑓𝑡𝑡𝑖𝑖 = 1…”

Section: Theory Of Optical Phase Arrays (Opa)mentioning

confidence: 99%

Conceptual design and analysis of a compact liquid crystal on silicon non-mechanical optical beam steering antenna for lean platforms

Ishola¹,

Kolev²,

Kunimori³

et al. 2023

Free-Space Laser Communications XXXV

View full text Add to dashboard Cite

We present concept design of an innovative, compact, non-mechanical optical beam steering antenna with an experimental liquid crystal beam shaper optimized for lean platforms. Laser communication terminals in air and space-borne platforms must fulfil the low-SWaP (size, weight, and power) design philosophy which is often a challenging task when utilizing mechanical steerers like prisms, MEMS fast steering mirrors, lenslet arrays, gimbal movers etc. We introduce the approach of a compact photonics integrated circuit consisting of power division network, optical phase array antennas and liquid crystal on silicon structure to form a laser transmitting module for a CubeSat. An Erbium Doped Fiber Amplifier provide adequate optical power output that can facilitate a baseline free-space communication link margin at 1550nm. The design parameters were tuned to achieve to minimal divergence and adequate beam steering angle, higher EIRP, high beam switching speed and tolerance of space environmental conditions. Applications are numerous and not limited to optical communication terminals on drones, aircrafts, and satellites; automotive LiDAR systems, medical and scientific instrumentation devices are also promising areas of rapid adoption and integration.

show abstract

Section: Theory Of Optical Phase Arrays (Opa)mentioning

confidence: 99%

Conceptual design and analysis of a compact liquid crystal on silicon non-mechanical optical beam steering antenna for lean platforms

Ishola¹,

Kolev²,

Kunimori³

et al. 2023

Free-Space Laser Communications XXXV

View full text Add to dashboard Cite

show abstract

“…It is more preferable in various applications such as laser heat processing, optical data processing, and photobiomodulation therapy. − Beam shaping is currently the primary technique for flat-top beam generation. Traditional beam shaping methods typically involve transforming Gaussian beams into flat-top beams through spatial optical systems, such as aspherical lens combinations, microlens arrays, and diffractive optical elements. − While these methods have the advantages of a good beam shaping effect and small light energy loss, they often introduce complex optical systems in practical applications, which can impact the integration and stability of the optical systems and come at a high cost. Fiber-based beam shaping methods can effectively circumvent these issues.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Flat-Top Beam Emission with an All-Fiber Multimode Laser

Lou,

Ge,

Gou

et al. 2024

ACS Photonics

View full text Add to dashboard Cite

Flat-top beams can eliminate the adverse effects of traditional Gaussian beams due to an uneven energy distribution. It is widely used in laser processing, image processing, and biomedical fields. The generation of pulsed flat-top beams using fiber lasers has gradually become a hot research topic in recent years. In this work, we propose an effective strategy to directly generate ultrafast flat-top beams with an all-fiber multimode laser without additional beam shaping. Utilizing the inherent characteristics of the multimode fiber, misalignment splicing of fibers, and tapered fibers in the cavity, we experimentally realize ultrashort pulses with flat-top beam shape through spatiotemporal mode-locking (STML). Numerical simulations based on the generalized multimode nonlinear Schrodinger equation further confirm that the flat-top beam is due to the coherent superposition of different transverse modes. To the best of our knowledge, this is the first time that the picosecond-level pulses with a flat-top beam shape are experimentally realized in all-fiber lasers. This work is of great significance for the development of ultrafast flat-top beams and also helps to broaden the applications of flat-top beams and multimode fiber lasers.

show abstract

“…Generally, the output laser energy distribution of a semiconductor laser is a Gaussian distribution, so beam shaping is required to shape the Gaussian beam into a collimated flat-top beam with uniform energy distribution within a certain distance to avoid the adverse effects caused by non-uniform energy distribution. Several methods have been developed to shape Gaussian or Gaussian-like beams into flat-top beams [2], including the microlens array shaping method, the diffractive optical element (DOE) method [3], the liquid crystal spatial light modulator (SLM) method [4], and the aspherical lenses array method [5], and others. Among these shaping methods, aspherical lenses array method is a widely used method due to its advantages such as simple structure, high damage threshold, and high transmission rate etc.…”

Section: Introductionmentioning

confidence: 99%