Chichkov, B.

Eichmann, H.

Mossavi, K.

Wellegehausen, B.

English

MPG.PuRe

~~~ ~~~~ ~ $:30-1&30 BALLROOM A JFA - Joint Symposium on High Power Lasers and ‘I%& Applications II Presider: P.V. Nickles, Max Bom Imtitut. Mtn. GERMANY O8:3O (Invited) J FA1 High-order harmonics: Generation and applications Anne L‘liuillier Ikpurrmoir of Physics, Lurid Itistirut(, i$T(diiiolo,yy p.0. Box 118. s- 221 00 Luud. SWt,(/l!Il 7d: +46 46 2227601 Fux: +46 46 2224250 When an intense laser is focused into a gas jet, very high-order harmonics can be produced. The harmonics are emitted approximately with the Same efficiency up to orders as high as 143 and to energies as high as 1 XO eV (6 nm). They have the same characteristics as the generating laser: they are collimated, intense, coherent and of short pulse duration. Thus, these phenomena are interesting not only from a basic point-of-view as a probe of the response of an atom to a strong laser field, but also, from a more applied point-of-view, as an interesting soft X-ray source, with specific properties. The radiation can be used in traditional applications in atomic, molecular and solid-state physics, such as lifetime measurements. More “exotic” applications, such as the production of attosecond (subfemtosecond) light pulses, have also been proposed. Both aspects, the understdndillg of the physics of harmonic generation, as well as the applications of this new XUV radiation source will be reviewed. 09:OO JFAP (Invited) Recent Progress of Nonlinear ShortPulee Tunable W V  and XUV Generation 13. Wellegehausen. K .  Mossavi. II. ISI(.IIIII.LIIII. 3 N  (!liiclikov summary SIio~%pulse, 111gIi peak power K r F  (2Oiri.1, ,1t)f1 I s !  . ~ i i O  ‘1‘i:SappIiirv Iascx~ (100n1.1, 150 fs) are used to generate (~olimwt V l l V  . ~ i i d  XUV radiatioii b y  l o w  - and high order nonlinear optical prowss<’s I i r  I j i i l l r  cases, tiiiiahilit.y is arliievrd by sum- or difference- frequency niixnlg wlt.li ra(liation from 3 high peak power optical parametric oscillator-amplifirr s v s 1 m i  ini.1-lrvel, around 500 Is) With the KrF laser, resonant third- or fifth-order prorrsses ni Xe and A r  havc been investigated. With optimized pulsed gas jets ;uid 1 sliglit noncollinear phasr rnai.rhtng geometry, tunable VUV radiat.ion .troiriid 155 r i i n  with energies up to I w.1 al. pulse durations below 1 ps and (iiirvrrstrui dfirieucy approaching 5% l iave been obtained. For the XUV range ~ ~ i o i i i r ~ l  ‘tr) iitn. ruergies of 0.1 1 1t1 dre i>xperted. In high- order harmonic generation with the TiSapphirc laser, typically a comb of almost equally intense harmonics is obsrrvrd i n  t h r  plateau region, covering spectral ranges down to 10 nm ill. In order to structure this spectrum, high order < , I  2 ( j ~  frequency mixing rxperiments have been performed, including polai~zdl .~oi i  ciiiitrol /2/ and refractivr rndrx manipulation due to plasma formation i n  11rr ~~ini l i i~rar  material. Indications of phase matching for individual harmonics nnd piosperts for a harmonic mginerring will be discussed. I< rlerfwces :II , 2 /  If ISichmann, A. Egbert, S. Nolt.e, C:. M ~ i i ~ r r i ~ ~ .  I3 W<.llrgrliausen, W. Rerkrr. S Iring, .I. K. Mclver; Phys Rev. A 51, R :MI-! ! I W r ~ i  .I . I .  Macklin, J. D. Kmeter, C .  L. Gordoli Ill. I ’ l i y ~  H r v  I,rl,l 70, 776 (1993) 

Recent Progress of Nonlinear ShortPulee Tunable W V and XUV Generation

http://hdl.handle.net/11858/00-001M-0000-0013-5B7C-D

Recent Progress of Nonlinear ShortPulee Tunable W V and XUV Generation

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