TITLE

Laser Beam Shaping

AUTHOR(S)
Aït-Ameur, Kamel; Passilly, Nicolas; de Saint Denis, R.; Fromager, Michaël
PUB. DATE
September 2008
SOURCE
AIP Conference Proceedings;9/23/2008, Vol. 1047 Issue 1, p59
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We consider the promising properties of very simple Diffractive Optical Elements (DOE) for reshaping the intensity profile of a laser beam. The first type of DOE that we have considered is a phase aperture which consists in a transparent plate with a circular relief introducing a π phase shift in the central region of the incident beam. The phase aperture is able to convert a Gaussian beam into a super-Gaussian, a ring-shaped or a doughnut profile. The second DOE that has been considered is an adjustable axicon able to transform a Gaussian laser beam into a dark hollow beam or a Bessel-Gauss beam. The desired conical geometry is obtained from a deformable mirror formed by a 2 inches, 0.25mm thick silicon wafer supported by a standard 2 inches optical mount. To achieve the adequate deformation a small metallic ball pushes the back of the mirror wafer. The realized shape is monitored with a Shack-Hartmann wave-front sensor and it is shown that conical shape cannot be achieved. Nevertheless, recorded wave fronts exhibit important third order spherical aberration able to achieve beam profile transformation as conical lenses.
ACCESSION #
34481120

 

Related Articles

  • Effect of diffraction on stimulated Brillouin scattering from a single laser hot spot. Eliseev, V.V.; Rozmus, W.; Tikhonchuk, V.T.; Capjack, C.E. // Physics of Plasmas;Oct96, Vol. 3 Issue 10, p3754 

    Reports on a single laser hot spot in an underdense plasma represented as a focused Gaussian laser beam. Stimulated Brillouin scattering (SBS) from the beam; Reflectivity from a single laser hot spot; SBS gain per one Rayleigh length of the incident laser beam.

  • Energy transfer between crossing laser beams. Kruer, William L.; Wilks, Scott C.; Afeyan, Bedros B.; Kirkwood, Robert K. // Physics of Plasmas;Jan1996, Vol. 3 Issue 1, p382 

    Considers induced scattering between crossing laser beams including the effects of long-wavelength modulations in the plasma. Impact on the choice of beam-smoothing techniques for laser-driven hohlraums; Ideal way to quantify stimulated scattering instabilities; Variation of the intensity,...

  • Stimulated scattering of relativistically strong radiation from an underdense plasma at... Sakharov, A. S.; Kirsanov, V. I. // Physics of Plasmas;Sep97, Vol. 4 Issue 9, p3382 

    Discusses the theory of stimulated scattering of relativistically strong, arbitrarily polarized laser radiation from an undersense plasma. Occurrence of the scattering at the odd and high-frequency harmonics in a wide range of angles; Growth rate of the instability associated with the harmonic...

  • Optical recording of information pits in thin layers of chalcogenide semiconductors. Morozovska, A. N.; Kostyukevych, S. A.; Nikitenko, L. L.; Kryuchin, A. A.; Kudryavtsev, A. A.; Shepeliavyi, P. E.; Moskalenko, N. L. // Semiconductor Physics, Quantum Electronics & Optoelectronics;2004, Vol. 7 Issue 1, p93 

    The paper is devoted to the theoretical consideration of the question how to record pits with the necessary height profile in photosensitive materials by varying their heat conductivity, photosensitivity, optical absorption, as well as the recording gaussian beam intensity, radius and exposure...

  • Transient and time periodic self focusing of a laser beam in a plasma. Bharuthram, R.; Parashar, J.; Tripathi, V.K. // Physics of Plasmas;May99, Vol. 6 Issue 5, p1611 

    Develops a theoretical model for self focusing of a Gaussian laser beam with step function temporal profile in a collisionless plasma in the paraxial ray approximation. Expression for modified electron density in the paraxial region as a function of space and time; Solution for the wave...

  • Illumination uniformity of a capsule directly driven by a laser facility with 32 or 48 directions of irradiation. Temporal, M.; Canaud, B.; Laffite, S.; Le Garrec, B. J.; Murakami, M. // Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p064504 

    The uniformity of the illumination of a spherical capsule directly driven by laser beams has been assessed numerically. Two schemes characterized by 32 and 48 directions of irradiation with associated a single laser beam or a bundle of laser beams characterized by a super-Gaussian intensity...

  • Time resolved side scatter diagnostics at NOVA Kyrala, George A.; Evans, Scott; Jimerson, Johnny; Fernandez, Juan // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p664 

    Describes a fiber-optically coupled streak camera that was used to measure temporally and angularly resolved side scatter radiation during the interaction of a laser beam with the long scale length plasma in a hohlraum. Diodes; Design of the streak camera system; Contribution to side scatter...

  • Scattering of radiation off random density irregularities in a laser-produced plasma. Dragila, R. // Journal of Applied Physics;7/1/1986, Vol. 60 Issue 1, p95 

    Investigates the effect of scattering laser radiation penetrating to the critical region off random density irregularities present in the underdense region of a laser-produced plasma. Problem of plasma density profile modification by the ponderomotive force; Resonance absorption modification...

  • A compact double-pass Raman backscattering amplifier/compressor. Ren, J.; Li, S.; Morozov, A.; Suckewer, S.; Yampolsky, N. A.; Malkin, V. M.; Fisch, N. J. // Physics of Plasmas;May2008, Vol. 15 Issue 5, p056702 

    The enhancement of stimulated Raman backscattering (SRBS) amplification was demonstrated by introducing a plasma density gradient along the pump and the seed interaction path and by a novel double-pass design. The energy transfer efficiency was significantly improved to a level of 6.4%. The seed...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics