Shaping of annular laser intensity profiles and their thermal effects for optical trepanning

Zeng, D.; Latham, W. P.; Kar, Aravinda

doi:10.1117/1.2150789

Cited by 13 publications

(3 citation statements)

References 7 publications

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“…The second application we present by using our model is a large-core multimode fiber doughnut beam tuner. Doughnut beams are now widely used in communication 13, 14 , microscopy 15, 16 , laser drilling 17 , optical trapping 18 , and laser surgery 19 . The intensity profile of the doughnut beam needs to be adjusted to achieve specific purposes.…”

Section: Introductionmentioning

confidence: 99%

“…One example is the stimulated emission depletion microscopy for super resolution imaging 20 , in which the doughnut intensity profile influences the resolution. As another example, in laser surgery and laser drilling, the intensity profile of the doughnut beam is required to realize desirable heating or drilling patterns 17, 21 . Additionally, doughnut beam was used in optical trapping as a sperm sifter 22 .…”

Section: Introductionmentioning

confidence: 99%

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Power Flow in a Large-Core Multimode Fiber under External Perturbation and its Applications

Qian

Yang

Zhong

et al. 2017

Sci Rep

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Large core optical multimode fiber provides benefits such as a large light-coupling tolerance, easy handling, and delivery of higher light power without undesirable nonlinear effects. In this research, we exploit the effects of external perturbation on the power flow within the large core fiber and present two relevant applications, namely a perturbation sensor and a doughnut beam tuner. Since conventional multimode fiber power flow model does not take into consideration the perturbation effect, we modify the power flow model so that the influence of time varying perturbation can be theoretically analyzed. Based on our theory, we further conduct the numerical simulation and experiments on these two applications. For the fiber vibration sensor, the proposed numerical model shows that the sensor sensitivity depends on the intensity profile of the launched beam and also the higher-order harmonics that were not reported previously can become interferences to affect the signal. For the beam tuner application, we prove both theoretically and experimentally that the doughnut intensity profile at the fiber output can be tuned in real-time by applying external perturbations to the fiber. We expect that the results can be useful to further exploit the external perturbation on large core fiber in various applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Flow in a Large-Core Multimode Fiber under External Perturbation and its Applications

Qian

Yang

Zhong

et al. 2017

Sci Rep

View full text Add to dashboard Cite

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“…1 It is widely used in laser materials processing, such as pulsed laser deposition, lithography, micromachining, 2 laser fusion, laser radar, laser scanning, and optical data processing. 3 For different laser materials processing applications, different irradiance profiles, such as flat-top beam, Bessel beam, and annular beam [4][5][6] have been utilized. The easiest approach in shaping a beam is the use of apodization and truncation.…”

Section: Introductionmentioning

confidence: 99%

Diffractive optical elements for pitchfork beam shaping

2009

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A set of laser beam shaping optics is designed by an iterative method using an adaptive additive algorithm to transform a Gaussian beam into a pitchfork beam. Two diffractive optical elements are designed based on Fresnel diffraction to reduce the amount of energy in the first-order diffraction ring and to increase the depth of focus for the optical system. These two beam properties are found to depend on the diameter of the desired beam and the Airy disk diameter. If the diameter of the desired beam is large, then the optical system yields better results in achieving the above-mentioned two beam properties. The performance of the diffractive optical elements is compared to a previous laser beam shaping system designed by the ray-tracing technique. A pinhole scanning power meter is used to measure the laser irradiance profile at the focal plane to verify the existence of the pitchfork beam. The irradiance profile measurement shows that diffractive optical elements allow better control for reducing the amount of energy in the diffraction side lobes.

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