Laser far-field beam-profile measurements by the focal plane techniques

by G. W. Day

Publisher: Dept. of Commerce, National Bureau of Standards, Institute for Basic Standards, Electro-Magnetic Division : for sale by the Supt. of Docs., U.S. Govt. Print. Off. in Boulder, Colo

Written in English
Published: Pages: 44 Downloads: 843
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Subjects:

  • Laser beams -- Measurement.

Edition Notes

StatementG. W. Day, C. F. Stubenrauch.
SeriesNBS technical note ; 1001, NBS technical note -- 1001.
ContributionsStubenrauch, D. F., Institute for Basic Standards (U.S.). Electromagnetics Division.
The Physical Object
Paginationiii, 44, [1] p. :
Number of Pages44
ID Numbers
Open LibraryOL15222692M

  In this chapter, we review recent achievements of far-field label-free super-resolution microscopy (LFSRM) that deploys materials absorption to provide the contrast. In the linear absorption modalities, samples convert photon energy to heat efficiently, which turns the photothermal detection with single-molecule sensitivity into : Chen Li, Ji-Xin Cheng. Optics has enabled laser surgery, optical diagnostic techniques, and visualization of the body's interior (see Figures and and Boxes and ).. Although the applications of optics to surgery and medicine have increased rapidly since the invention of the laser in , a number of optical techniques were used before that time. The precision of the focal spot sample positioning is obtained by a galvanomirror set in the plane of the sample and a piezostage in the out‐of‐plane direction. A charge‐coupled device (CCD) camera is used for monitoring the focal spot on the sample and in situ fabrication Cited by:   Ok, but I am actually more interested in a laser beam in free space. Gordianus suggested the laser beam in free space is identical to an infinitely wide plane wave, multiplied by a gaussian-like beam profile in the cross sectional plane. My objection against that suggestion is that it makes ##\nabla\cdot\mathbf{E}## nonzero.

Experimental cross-polarization detection of coupling far-field light to highly confined plasmonic gap modes via nanoantennas J. Wen, P. Banzer, A. Kriesch, D. Ploss, B. Schmauss, U. Peschel APPLIED PHYSICS LETTERS 98 (10) () | Journal. PROCEEDINGS VOLUME Laser-Induced Damage in Optical Materials Editor(s): First principles simulation of the dynamics of transient warm dense matter during the formation of ultrashort laser pulse induced damage using the particle-in-cell method Nanosecond multiple pulse measurements and the different types of defects. Key words: Laser circular and elliptical beams, lenses, beam parameters. A 0 r p x y z z dA(x',y',0) P(x,y,z) x y w 0 w z O S 0 Phase front 0 r 1. INTRODUCTION Calculation of laser radiation field can be made using the aperture field method or using the spectrum of plane waves [1], or paraxial approximation of Helmholtz equation [2]. All these. The emission from such a laser will display a far-field diffraction pattern at a distance (Equation, see printed copy) where a is the diameter of the emergent laser radiation. The TEM(oo) beam from a typical helium neon laser will display a milliradian beam spread at a distance of meters from the laser.

Laser Microfabrication. Thin Film Processes and Lithography Daniel J. Ehrlich and Jeffrey Y. Tsao (Eds.) This book reviews the solid core of fundamental scientific knowledge on laser-stimulated surface chemistry that has accumulated over the past few years. It provides a useful overview for the student and interested non-expert as well as. Aberrated beam propagation through turbulence and comparison of Monte Carlo simulations to field test measurements Nelofar Mosavi,a,b,* Charles Nelson,c Brian S. Marks, aBradley G. Boone, and Curtis R. Menyukb aJohns Hopkins University Applied Physics Laboratory, Johns Hopkins Road, Laurel, Maryland , United States bUniversity of Maryland, .   The effect of the beam numerical aperture was addressed by Sirven et al. 48 and an autofocus algorithm based on searching the best in-focus image was described by Novotny et al. 55 The complexity of the laser–sample interaction can be seen from the study of Lednev et al., 56 who investigated the influence of the spatial beam profile of the Cited by: laser radar handbook loss attenuation wavelength field antenna bandwidth data probability detector clutter snr atmospheric angle aperture efficiency radars eo handbook You can write a book review and share your experiences. Other readers will.

Laser far-field beam-profile measurements by the focal plane techniques by G. W. Day Download PDF EPUB FB2

An analysis of laser far-field beam-profile measurements by the focal plane technique is given. Particular attention is paid to systems at A/lym wavelength aua having apertures up to 10 cm. The basic mathematics is reviewed and approx- imations are evaluated.

Additional Physical Format: Online version: Day, G.W. Laser far-field beam-profile measurements by the focal plane techniques. Boulder, Colo.: Dept. of Commerce. Laser Far-Field Beam-Profile Measurements by the Focal Plane Technique. Published. March 1, Author(s) Gordon W.

Day, Carl Laser far-field beam-profile measurements by the focal plane techniques book. Stubenrauch. Citation. Technical Note (NIST TN) - Report Number. NIST Pub Series. Technical Note (NIST TN) Pub Type. NIST Pubs. Created March 1,Updated Janu Cited by: 1. Laser far-field beam-profile measurements by the focal plane technique Item Preview remove-circle Share or Embed This Item.

Laser far-field beam-profile measurements by the focal plane technique by Day, G. W.; Stubenrauch, C. Publisher National Bureau of Standards (U.S.). Laser far-field beam-profile measurements by the focal plane techniques. Responsibility G. Day, C. Stubenrauch.

Imprint Laser beams > Measurement. Bibliographic information. Publication date Series NBS technical note ; Note Issued March Download PDF The Far Field book full free. The Far Field available for download and read online in other formats.

Search Laser far-field beam-profile measurements by the focal plane techniques PDF eBook for Download and Read Online. Focal planes. Laser far-field beam-profile measurements by the focal plane techniques.

However, for beams with less than mrad divergence, the far field can be simulated by passing the beam through a diffraction-limited laser-grade lens or focusing mirror (Figure 3) and measuring the transformed beam that occurs at the focal plane of the optic (not the focused beam waist).

Figure 3. Far-field optical setup. direct near-field profile measurement techniques. Far-field measurements are considerably easier to perform and offer an attractive alternative for this characterization.

To assess this alternative, profiles of edge-emitting laser diodes and VCSELs, and the spot size of focused laser beams were determined from far-field and near-field measurements. A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path.

Since there are many types of lasers — ultraviolet, visible, infrared, continuous wave, pulsed, high-power, low-power — there is an assortment of instrumentation for measuring laser beam profiles.

FAR-FIELD. Far-field Antenna Measurements. For certain applications, far-field antenna measurements are the preferred technique for determining the amplitude and/or phase characteristics of an AUT.

Low gain antennas operating below 1 GHz, and where partial radiation characteristics are required, are candidates for far-field measurements.

On a. Current Technology of Laser Beam Profile Measurements Carlos B. Roundy, Ph.D. Spiricon, Inc. Logan, UT Phone: ()Fax: ()E-mail: [email protected] 1.

Introduction There are many applications of lasers in which the beam profile is of critical importance. WhenFile Size: 2MB. Laser-based techniques for particle-size measurement have become increasingly important in combustion research and many other disciplines.

Instruments are continually being developed and improved to meet the demanding geometric, accuracy and other requirements associated with current research and industrial by: The theory and techniques of laser beam shaping are addressed in the book edited by Dickey and Holswade.l Laser beam shaping techniques can be divided into three broad classes.

measurements of beam profile in focal plane of cylinder l ens and a plane shifted to the le ns are shown in Fig. Figure Examples of Beam Shaping of multimode fiber laser according to. Beam profilers are used in various ways; a qualitative impression of a beam profile can help during alignment of a laser, whereas measurements of the beam radius at different locations along the beam axis (the caustic) allow one to calculate the M 2 factor or the beam parameter product, quantitatively characterizing the beam quality.

Laser beam profile measurements at laser output (near field) and focal spot (far field) were carried out with CCD camera (DragonFly2, PoinGreyResearch) equipped with neutral optical filters. Camera exposure time was set to ms thus the image obtained was a Cited by: 4.

From the one-shot intensity and phase measurements and numeric propagation the laser beam is obtained at >10 positions.

The instrument is suitable for measurement of both CW and pulsed lasers down to single-shot rates, and provides quantitative measurement of numerous beam spatial characteristics in accordance with the ISO standard and M. profile changing along the axis.

At the beam waist, where the phase front becomes plane, the beam contracts to a minimum diameter 2w 0 (z=0, R=∞). For most practical lasers, the location of the beam waist generally lies within the laser cavity For large values of z the beam expands linearly and has a far-field divergence angle (θ).File Size: 6MB.

As with any wavefront sensor, the laser beam is focused by optics in order to match the size of the beam with that of the sensor. With phase diversity, the sensor area is installed at the image focal plane of a lens.

Note that it is advisable to install a clear aperture at the front focal plane of the optics in order to ensure a. μm), far field (z= ±0 μm), intermediate field (z= ± μm). The images are made with a 10X NA objective lens, with an aperture with diameter 3 mm in its front focal plane. The incident beam is expanded from 8 mm to 22 mm before the aperture.

The beam profile represents an Airy disk at z = 0, and approachesFile Size: 5MB. For CO 2 lasers, the situation becomes far more challenging. Most CO 2 applications employ lasers in the kW power range with focused spot sizes from to μm.

Focal lengths of the focusing optics however are longer, from to mm. It will be shown why this is an advantage when measuring focused CO 2 spots.

Typical focal plane arrays available for use in. X-ray focus optimization and characterization based on coherent scattering and quantitative speckle size measurements was demonstrated at the Linac Coherent Light Source.

Its performance as a single-pulse free-electron laser beam diagnostic was tested for two typical focusing configurations. The results derived from the speckle size/shape analysis show the Cited by: 9. Laser induced damage in optical materials: proceedings of a symposium sponsored by the American Society for Testing and Materials and by the National Bureau of Standards ASTM special technical publication Proceedings of SPIE--the International Society for Optical Engineering: Authors: United States.

Many laser material processing applications require an optimized beam profile, e.g., ring shape or Top-Hat profiles with homogeneous intensity distribution.

In this study, we show a beam shaping concept leading to a phase shifting element with binary height profile as well as a very low periodicity with near diffraction limited spot size. Further advantages of so-called Fundamental Cited by: 1. All-Fiber Laser Beam Shaping Using a Long-period Grating The far-field beam Model C) for 2-D measurements.

The laser beam profile at D = 7 mm was examined at different wavelengths using the IR camera. Fig. 2a displays a 2D beam profile measured at wavelength of nm, corresponding.

Fig. 16a presents the simulated far-field result using a super-Gaussian beam profile and different phase maps: 1) the computed phase target with a linear profile; 2) the measured phase after the AO loop. We note that using the measured phase, an important amount of parasitic light appears around the two main focal : Ji-Ping Zou, Benoit Wattellier.

Fred M. Dickey is a distinguished member of the technical staff at Sandia National Laboratories, Albuquerque, New Mexico. He is the author of more than 75 papers and book chapters and holds nine patents. He is coeditor and coauthor of the book Laser Beam Shaping: Theory and Techniques published by Marcel Dekker ().

His current research interests include laser Cited by: 5. CONFERENCE PROCEEDINGS Papers Presentations Journals. Advanced Photonics Journal of Applied Remote Sensing. The standard “closed aperture” Z-scan apparatus (i.e. aperture in place in the far field) for determining nonlinear refraction is shown in Fig.

The transmittance of the sample through the aperture is monitored in the far field as a function of the position, Z, of the nonlinear sample in the vicinity of the linear optics focal position. Introduction to Items of Interest This chapter represents a potpourri of general laser information.

Basically, when something interesting and relevant to lasers shows up on one of the USENET newsgroups or elsewhere, it gets stuck in here. Therefore, given the great breath and depth of the laser field, the content is quite sparse - but growing.

RP Photonics Encyclopedia (formerly the Encyclopedia of Laser Physics and Technology) comprehensive encyclopedia articles on photonics, laser technology, fiber optics and general optics; freely available online (open access, no registration), and as a two-volume book; connected with the RP Photonics Buyer's Guide.Precision measurements of the BICEP/Keck Array beams in the far field are enabled by our small-aperture approach.

The standard far-field distance criterion of 2 D 2 / λ, where D is the aperture size ( cm) and λ is the wavelength, yie 70, and m for Keck Array receivers at 95,and GHz, respectively.We offer laser beam analysis products for profiling laser beams, characterizing pulses, and detecting position. × FREE 2-Day shipping on all web orders!* Learn More + FREE T-Shirt with orders $+ Details.