WAVELENGTH SCALING OF LITHIUMLIKE RECOMBINATION SCHEME FOR XUV GAIN PRODUCTION


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1 WAVELENGTH SCALING OF LITHIUMLIKE RECOMBINATION SCHEME FOR XUV GAIN PRODUCTION A. Carillon, F. Gadi, B. GauthÉ, H. Gunnou, P. Jaglé, G. Jamlot, A. Klisnick, C. Möllr, A. Surau To cit this vrsion: A. Carillon, F. Gadi, B. GauthÉ, H. Gunnou, P. Jaglé, t al.. WAVELENGTH SCALING OF LITHIUMLIKE RECOMBINATION SCHEME FOR XUV GAIN PRODUCTION. Journal d Physiqu Colloqus, 1987, 48 (C9), pp.c9375c < /jphyscol: >. <jpa > HAL Id: jpa Submittd on 1 Jan 1987 HAL is a multidisciplinary opn accss archiv for th dposit and dissmination of scintific rsarch documnts, whthr thy ar publishd or not. Th documnts may com from taching and rsarch institutions in Franc or abroad, or from public or privat rsarch cntrs. L archiv ouvrt pluridisciplinair HAL, st dstiné au dépôt t à la diffusion d documnts scintifiqus d nivau rchrch, publiés ou non, émanant ds établissmnts d nsignmnt t d rchrch français ou étrangrs, ds laboratoirs publics ou privés.
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3 JOURNAL DE PHYSIQUE Colloqu C9, supplmnt au n012, Tom 48, dgcmbr 1987 WAVELENGTH SCALING OF LITHIUMLIKE RECOMBINATION SCHEME FOR XUV PRODUCTION GAIN A. CARILLON, F. GADI, B. GAUTH~, H. GUENNOU, P. JAEGL~, G. JAMELOT, A. KLISNICK, C. MOLLER and A. SUREAU Laboratoir d Spctroscopi Atomiqu t Ioniqu, Bat. 350, Univrsit ParisSud, F Orsay Cdx, Franc and GILM, Ecol Polytchniqu, F Palaisau Cdx, Franc RESUME. On prsnt ds valurs d gain obtnus tant par msurs xprimntals qu par prvisions thgoriqus pour ls transitions 3d5f, 3d4f t 4d5f ds ions 1ithiumoEds dans &+s plasmas produits par lasr. A la suit d'un tud dgtaillg du cas d l'ion A1 /1/ t n s fondant sur ds prgvisions obtnus par calcul pour ls ions d charg plus 6lv /32/, nous prgsntons ls prmirs rsultats xpgrimntaux c_o crnant ls ions s1 +. En particulir, un cofficint d gain d P l'ordr Q 1 cm a 6t6 msurg pour la transition 3d5f d S XIV 2 la longuur d'ond d 65.2 A, qui st la plus court pour laqull la msur d'un gain ait jamais 1'pY)t f 81t dluf.g+ publication jusqu'8 c jour. Ds calculs concrnant ls ions K, Ca t Ti sont 6galmnt prgsnt6s. ABSTRACT. Obsrvd and prdictd valus of gain for 3d5f, 3d4f and 4d5f transitions of lithiumliklof+ons in lasrproducd plasmas ar rportd. Aftr an xtnsiv study of th A1 cas /1/ and following calculatd prdict992 for highrz ions /2/ w prsnt th first xprimntal rsu ts concrning th S ion. 3 In particular, a gain cofficint of th ordr of 1 cm has bn masurd for th 3d5f transition of S XIV at th wavlngth of , which is th shortst for which th masu a gain s vr bn publishd to day. Som calculat~ons concrning th K 5~n\aq5t, and Ti1'' ions ar also prsntd. INTRODUCTION. Although no Xray lasr dvic has yt bn achivd to day, th most rcnt progrss in this fild /3/ has mad it sur such a fasibility. As a consqunc of that, th proccupation of sarchrs is no mor only to incras th valu of th gainlngth product thy obtain in thir xprimnts, but also to look forward for futur applications. Among ths, th intrst of biologists for shortr wavlngths comprisd btwn 23.3 and , in th socalld watrwindow, is now wll known. In this rang, sinc watr is rathr transparnt to radiation whil carbon is opaqu, on can hop to obtain holograms of living protins with a good contrast. That is on of th rasons why wavlngthscaling of th diffrnt schms considrd for Xray lasing action has bcom an incrasing proccupation. PRESENTATION. In this qgqr w shall dal with lithiumlik rcombination schm, dparting from th A1 ca: for which w hav rportd an amplification of spontanous mission at A as arly as 1978 /4/. Indd, if on considrs ths ions in a rapidly cooling plasma, population invrsion appars btwn th lowr 3d lvl and th uppr 4f (154.6 A) and 5f lvls ( ) as prdictd by calculation taking into account radiativ cascads and collisionnal transitions rats /2,5,6/. Exprimntal gain masurmnts hav bn prformd for both transitions, in th corona, i.., in a rbon 2.j th lasrproducd plasma whr lctronic dnsity N is of th ordr of 10 cm. Th wavlngth of th lasr was pm and th pul~s duration was ithr 600 ps or 2 ns. Th lasr bam was Focusd on th surfac of a massiv targt by two crossd cylindrical lnss, providing a fairly homognous lighting along th focal lin of 1 to 2 cm long. Th flux linar dnsity on th targt was in th rang of 0.5 to 20 GW/C~. Gain G was dducd from th nhancmnt of mittd intnsity I1 with plasma lngth 1 using th rlation I orxp(g1) Timrsolvd xprimnts hav shown that amplification taks plac durxng plasma Articl publishd onlin by EDP Scincs and availabl at
4 C9376 JOURNAL DE PHYSIQUE cooling aftr th top of th lasr puls. Masurd pak valus of gainlngth product ar comprisd btwn 2 and 2.5 cm. Ths rsults hav bn accountd for by thortical calculations which hav shown that, in th cas of aluminium, gain occurs for, th 5f3d and 4f3d transitions in th plasma corona during th cooling and rcombination phas. Calculations ar prformd with a collisionnalradiativ modl usd as th postprocssor of a hydrodynamical cod. Considring a highr Z lmnt as sulphur, for which th 3d5f and 3d4f transitions of SXIV ar situatd at 65.2 and 95.5 A, th C.R. modl has bn usd introducing various sts of dnsity and tmpratur obtaind from th hydrodynamical cod in th cas of Al. This is mad possibl by th rathr broad rang of convnint valus rvald by th cod. Th C.R. modl givs th valus of invrsion dnsity An and, sinc th xprssion of gain is givn by: G(cm 1 )= ~ 14 (An) S (M/kTi) 1/23 whr n is xprssd in cm, S is th lin strngth in u.a., M th atomic mass and Ti th ionic tmpratur in V, on can obtain th xpctd valu of gain in ach cas. Tabl I shows a comparison of rprsntativ rsults obtaind for Al and S. It appars that comparabl valus of gain can b obtaind with both lmnts. Al^ N(cm~ 3 ) 10^ _T_iC.V) ^.i LMn G(cm x ) W S An W S^.n X(A) GCcaT 1 ) X(A) GCcm" 1 ) 5f3d _ ~ "9574 ~2T3 ' ISA,7 S TABLE I On th basis of this valuation a study of th 5f3d transition in sulphur, at 65.2 A, has bn undrtakn. A massiv planar targt was usd and w compard intnsitis mittd by plasmas of 1 and 2 cm producd by a um'lso J lasr bam with a puls duration of 2 ns. Th lmgrazing incidnc spctromtr uss a 3,600 groovs/mm grating. An O.M.A. was usd for dtction. For this first xprimnt only timintgratd masurmnts wr mad. An xampl of rsult is shown on Fig.l. Uppr curvs rprsnt th spctra mittd by both plasmas in th rgion of 65 A. Th strongst lin^is th Sf^d at 65.2 A, whil th othr on on th lft sid is th 5d3p at 64.3 A. At 65.2 A, a suddn drop is clarly visibl in th absorption curv which is rprsntd in lowr part. A simulation has bn undrtakn to invstigat th ffcts of timintgration on th obsrvd valu of gain as wll as thos of th xprimntal width. Th rsult of this study, as it appars in Fig.2 and 3, shows that an instant gain of about 1 cm accounts for th xprimntal obsrvations. WAVELENGTH SCALING. Whn scaling with highr Zlmnts towards shortr wavlngths on must considr lasr intnsity, lctronic dnsity and lctronic tmpratur. In th Lilik rcombination schm, lasr intnsity must b sufficint for crating Hlik ions. Sinc th prsnc of ths ions is conditionning th invrsion schm, if Z is th atomic numbr of an lmnt, th scaling will dpnd not on Z but on th paramtr z=z2. So, with an lmnt Z', lt z'=z'2, th following rlations hav to b considrd: I'. =(z'/z) 3 T lasr lasr N '= (z'/z) 7 N T '= (z'/z) 2 T
5 C9377 Timrsolvd gain at th top of th lin dducd from a plasma modling Fig. 2 Exprimntal rsult in sulphur. Lowr part: absorption curv. Fig. 1 Timintgratd absorption curv a) dirctly dducd from gain in Fig.2 b) taking into account instrumntal width Fig. 3 On th basis of this scaling, dparting from sulphur, a thortical study has bn undrtakn concrning Ca, Ti and Cu /7/. Calculatd wavlngths in Angstrom of 3d4f, 3d5f, 4d5f and 4f5g transitions ar th following: 3d3/25f5/2 3d5/25f7/2 3d3/24f5/2 3d5/24f7/2 4d3/25f5/2 4f5/25g7/2 4d5/25f7/2 4f7/25g9/2 17+ Ca , _.19+ Ti , n 26+ Cu Extrapolatd plasma paramtrs hav bn introducd into th timdpndnt C.R. modl. Enrgy lvls and oscillator strngths usd in th modl ar obtaind by ab initio calculations with a modifid HartrFock mthod. Atomic dynamics includs radiativ cascads and lctron ion collisions. Rducdpopulation dnsitis N/g, whr g=2j+l is th statistical wight of th lvl, hav bn calculatd as functions of tmpratur T. This was prformd for diffrnt valus of N and in ach cas, for various valus of th paramtr X which rprsnts th proportion of Hlik to Lilik ions. On Fig.4 ar prsntd th most charactristic rsults obtaind for both 5f3d and 4f3d transitions. It appars that in all cass
6 C9378 JOURNAL DE PHYSIQUE significativ invrsionratio valus ar obtaind. Du to lack of spac, 54 transitions ar not prsntd hr although still strongr valus hav bn obsrvd in som cass. Thus, ths rsults dmonstrat th intrsting possibilitis offrd Lilik ions in XUV lasr studis. Fig. 4 CONCLUSION. Lilik rcombination schm sms particularly appropriat for scaling towards shortr wavlngths sinc th nd in powr dnsity for plasma production is rathr modrat. An illustration of that is rprsntd in Fig.5 whr w hav plottd powr dnsitis vrsus wavlngths for th diffrnt schms proposd today. Anothr aspct of this study is to show,013 up th intrst of invstigating also th 45 transitions, particularly th 4d5f and 4f5g, not for shortr wavlngths, but for highr gains. 10'~ S * 0 *: 3:lik *: Lilik Nilik,, MO 0.: 0  B 1 t a, 8 i I /'* '3.Eum Al 1 B =* i i j I i 1 1!! REFERENCES Fig P. JAEGLE, G. JAMELOT, A. CARILLON, A. KLISNICK, A. SUREAU and H. GUENNOU, J.O.S.A. B, 4, 563 (1987); (Fatur dition on th Gnration of Cohrnt XUV and SoftXray Radiation). 2  H. GUENNOU, A. SUREAU, C. MOLLER, Intrnational Colloquium on XRay Lasrs, Aussois, Franc, 1986; Journal d physiqu, C6351, Vol 47 (1986). /3/  D.L. MATTHEWS t al., Phys. Rv. Ltt, 54, 110 (1985) P. JAEGLE, G. JAMELOT, A. CARILLON and C. WEHENKEL, Jpn. J. Appl. Phys. 17, 483 (1978). 5  A. KLISNICK, H. GUENNOU and J. VIRMONT, Journal d Physiqu, 47, C6 351 (1986). /6/  H. GUENNOU and A. SUREAU, J. Phys. B, 20, 919 (1987). /7/  A. SUREAU, H. GUENNOU, C. MOLLER. Procdings of th I.U.A. colloquium No 102, Sptmbr 911 Sptmbr 1987, Bauliu s/mr, Franc.
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