Short pulse amplification in the presence of absorption

Tilleman, M. M.; Jacob, J. H.
January 1987
Applied Physics Letters;1/19/1987, Vol. 50 Issue 3, p121
Academic Journal
Energy amplification of short pulses in the presence of distributed absorption is analyzed and discussed. A short pulse is defined as a pulse length that is much shorter than the lasing state lifetime. It is shown that the energy density of a short pulse cannot be amplified indefinitely in the presence of nonsaturable absorption. In an active medium having a small signal gain g0 and a nonsaturable absorption α, the maximum attainable energy density is (Esat g0/α), where Esat is the medium saturation energy. High-energy densities are obtained at the expense of the extraction efficiency. An amplifier design can be optimized by choosing the appropriate parameters such as small signal gain and active medium gain length.


Related Articles

  • Two-photon absorption properties of commercial fused silica and germanosilicate glass at 264 nm. Dragomir, Adrian; McInerney, John G.; Nikogosyan, David N.; Kazansky, Peter G. // Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1114 

    Using high-intensity femtosecond pulses at λ=264 nm, we have measured the two-photon absorption (TPA) coefficient in three fused silica samples Suprasil, Herasil, Infrasil (Heraeus) and in 3.5 mol% Ge-doped fused silica. While in fused silica samples the TPA coefficient value is about 2 X...

  • Optical limiting behavior of bismuth oxide-based glass in the visible range. Oliveira, T. R.; de S. Menezes, L.; Falcão-Filho, E. L.; Gomes, A. S. L.; de Araújo, Cid B.; Sakaguchi, K.; Mezzapesa, F. P.; Carvalho, I. C. S.; Kazansky, P. G. // Applied Physics Letters;11/20/2006, Vol. 89 Issue 21, p211912 

    The authors report experimental results on the optical limiting behavior of a bismuth oxide-based glass by exciting the samples with nanosecond laser pulses at 532 and 598 nm. The results show that two-photon and free-carrier absorption processes contribute for the nonlinear absorption. Values...

  • Enhancement of optical absorption and photocurrent of 6H-SiC by laser surface nanostructuring. Zhao, Q. Z.; Ciobanu, F.; Malzer, S.; Wang, L. J. // Applied Physics Letters;9/17/2007, Vol. 91 Issue 12, p121107 

    Nanoscale ripple structures with spatial periods of up to 155 nm are generated by a single beam ultrashort pulsed laser structuring of 6H-SiC surface. The period of nanoripples does not depend on the laser fluence and the number of pulses. Optical absorption and photocurrent measurements on SiC...

  • Characteristics of optical limiting in media with nonlinear absorption and scattering. S. E.Zelensky; Kolesnik, O. S.; Kopyshinsky, O. V. // Semiconductor Physics, Quantum Electronics & Optoelectronics;2005, Vol. 8 Issue 3, p74 

    A comparative study is performed for characteristics of optical limiting in the media with nonlinear absorption and scattering with the use of nanosecond-scale laser pulses. Two methods are proposed to analyze of experimental nonlinear transmittance curves. The experiments revealed differences...

  • Shot-to-shot correlation of residual energy and optical absorptance in femtosecond laser ablation. Vorobyev, A.Y.; Guo, Chunlei // Applied Physics A: Materials Science & Processing;Jan2006, Vol. 86 Issue 2, p235 

    In this paper, we perform a shot-to-shot detailed study of how residual thermal energy correlates to the optical absorptance change due to laser-induced surface structural modifications in multi-shot femtosecond laser ablation. We observe an overall enhancement for residual thermal coupling and...

  • Transient dispersion and absorption in a V-shaped atomic system. Sahrai, M.; Maleki, A.; Hemmati, R.; Mahmoudi, M. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Apr2010, Vol. 56 Issue 1, p105 

    We investigate the dynamical behavior of the dispersion and the absorption in a V-type three level atomic system. It is shown that in the presence of decay-induced interference the probe dispersion and absorption are phase dependent. We find that an incoherent pumping field provides an...

  • Calculation of the probability of photoprocesses induced by ultrashort electromagnetic pulses. Astapenko, V. A. // Russian Physics Journal;Oct2010, Vol. 53 Issue 5, p437 

    n expression for the total probability of photoprocesses induced by ultrashort electromagnetic pulses in terms of the excited transition cross-section has been derived by using perturbation theory. The expression obtained is valid for any radiation spectral width and for various types of...

  • Static and optical field enhancement in metallic nanotips studied by two-photon photoemission microscopy and spectroscopy excited by picosecond laser pulses. Tsujino, S.; le Pimpec, F.; Raabe, J.; Buess, M.; Dehler, M.; Kirk, E.; Gobrecht, J.; Wrulich, A. // Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG 

    The authors studied the photoemission from molybdenum nanotip arrays with controlled apex curvatures by photoelectron microscopy and spectroscopy excited by 10 ps visible laser pulses under dc electric field. While two-photon photoemission microscopy demonstrates the enhancement of...

  • Dynamics Of Electronic Excitation Of Solids With Ultrashort Laser Pulse. Medvedev, Nikita; Rethfeld, Bärbel // AIP Conference Proceedings;10/8/2010, Vol. 1278 Issue 1, p250 

    When ultrashort laser pulses irradiate a solid, photoabsorption by electrons in conduction band produces nonequilibrium highly energetic free electrons gas. We study the ionization and excitation of the electronic subsystem in a semiconductor and a metal (solid silicon and aluminum,...

  • K radiation of foil under interaction with laser pulse of relativistic intensity. Andreev, A.; Platonov, K. // Optics & Spectroscopy;Jan2011, Vol. 110 Issue 1, p20 

    n analytical model of K radiation of thin laser targets has been developed. It has been shown that, for such targets, the motion of fast electrons is significant not only in the target itself but also in vacuum. The considered dependences for the free path length of a fast electron and for the...


Read the Article


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

Try another library?
Sign out of this library

Other Topics