Spot size and radial intensity distribution of focused Gaussian beams in spherical and non-spherical aberration lenses

Alkelly, Abdu A.

doi:10.1016/j.optcom.2007.05.031

Cited by 14 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several authors have shown the effect of extension of DOF by SA in the field of laser applications [42–44]. And hence, we hypothesize that the SA of standard orders would extend the DOF of AO-OCT imaging.…”

Section: Introductionmentioning

confidence: 71%

See 1 more Smart Citation

Extended depth of focus adaptive optics spectral domain optical coherence tomography

Sasaki¹,

Kurokawa²,

Makita³

et al. 2012

Biomed. Opt. Express

View full text Add to dashboard Cite

We present an adaptive optics spectral domain optical coherence tomography (AO-SDOCT) with a long focal range by active phase modulation of the pupil. A long focal range is achieved by introducing AO-controlled third-order spherical aberration (SA). The property of SA and its effects on focal range are investigated in detail using the Huygens-Fresnel principle, beam profile measurement and OCT imaging of a phantom. The results indicate that the focal range is extended by applying SA, and the direction of extension can be controlled by the sign of applied SA. Finally, we demonstrated in vivo human retinal imaging by altering the applied SA.

show abstract

Section: Introductionmentioning

confidence: 71%

“…It is noteworthy that the axicon can be considered to generate extremely high-order spherical aberration (SA) [ 41 ]. Several authors have shown the effect of extension of DOF by SA in the field of laser applications [ 42 – 44 ]. And hence, we hypothesize that the SA of standard orders would extend the DOF of AO-OCT imaging.…”

Section: Introductionmentioning

confidence: 99%

Extended depth of focus adaptive optics spectral domain optical coherence tomography

Sasaki¹,

Kurokawa²,

Makita³

et al. 2012

Biomed. Opt. Express

View full text Add to dashboard Cite

show abstract

“…Spot size is simply defined as the radial distance of the focused laser beam . For a diffraction limited Gaussian beam TEM 00 , the spot size ω 2 using focusing lens of focal length f is determined by the equation ω 2 = 2.44 λ f/ ω 1, where λ is the used laser wavelength and ω 1 is the beam waist before lens.…”

Section: Resultsmentioning

confidence: 99%

Surface heterogeneity study of some reference Cu-Ag alloys using laser-induced breakdown spectroscopy

Sheta

Carlo

Ingo

et al. 2015

Surf. Interface Anal.

View full text Add to dashboard Cite

Investigation of the chemical composition, surface structure, metallurgical features, corrosion mechanism, and surface modification techniques of archeological metallic artifacts from Romans and pre-Roman times aimed to simulate the most commonly used Cu-based and Ag-based alloys. These simulated reference alloys will be used as sacrificial materials to study the most appropriate conservation materials and procedures. In the present work, laser-induced breakdown spectroscopy (LIBS) is introduced as a new validated surface mapping technique to study the micro-chemical distribution of elements in binary reference copper-silver alloy samples. Using different techniques for surface and bulk analysis, such as SEM coupled with energy-dispersive X-ray spectroscopy and X-ray diffraction, it has been proven that LIBS is a simple, sensitive, and direct technique in the determination of heterogeneity of the sample's surface. By changing the laser wavelength (λ/nm) and focal length of the used focusing lens (f/cm), different spot sizes can be obtained. It was possible to control the spatial resolution in mapping the investigated samples' surface and to achieve local chemical information. In the present work, Q-switched neodymium-doped yttrium aluminum garnet laser has been used at its fundamental wavelength 1064 nm and its second harmonic 532 nm. The studied samples were specially manufactured heterogeneous copper-silver alloys with known grain size as studied via SEM investigation. The obtained LIBS results are in good agreement with those by other analytical techniques and extend the applicability of the surface techniques to study metallic ancient objects.

show abstract

“…The main reason for this phenomenon might be an optical aberration. Thus, the 6 µm thick photopolymer layer setting still causes optical aberration that limits the maximum irradiance point and leads to the splitting into two peaks 38 .…”

Section: Discussionmentioning

confidence: 99%

Micro and nanoscale 3D printing using optical pickup unit from a gaming console

et al. 2021

View full text Add to dashboard Cite

Conventional photopolymerization-based 3D printing still requires developing a concise and cost-effective method to improve the printing resolution at the nanoscale. Here, we propose the use of a gaming console optical drive pickup unit for 3D photopolymerization. This mass-produced optical pickup unit features a finely adjustable diode laser, allowing us to adjust the printing resolution from tens of micrometres down to hundreds of nanometres without requiring oxygen radical scavenging or costly femtosecond lasers. We evaluate the 3D printing performance using a commercial photopolymer under different laser exposure parameters. The proposed printing system achieves a resolution of 385 nm along the lateral direction and XYZ nano-resolution linear stages enable a printing volume of up to 50 × 50 × 25 mm3. Finally, we demonstrate the fabrication of 3D stereoscopic microstructures. The substantially simplified optics proposed here paves the way for affordable high-resolution micro/nanoscale 3D fabrication.

show abstract

Spot size and radial intensity distribution of focused Gaussian beams in spherical and non-spherical aberration lenses

Cited by 14 publications

References 14 publications

Extended depth of focus adaptive optics spectral domain optical coherence tomography

Extended depth of focus adaptive optics spectral domain optical coherence tomography

Surface heterogeneity study of some reference Cu-Ag alloys using laser-induced breakdown spectroscopy

Micro and nanoscale 3D printing using optical pickup unit from a gaming console

Contact Info

Product

Resources

About