Anisimov S.I., Faenov A.Yu., Inogamov N.A., Khokhlov V.A., Petrov Yu.V., Skobelev I.Yu., Zhakhovskii V.V.

Ablation of lithium fluoride dielectric crystal by the short pulses of x-ray plasma laser and extreme ultraviolet free electron laser

ITP RAS, Chernogolovka, Russia

JIHT RAS, Moscow, Russia

circle. dashed aby shown is ) mm 0.035(~ zoneablation the4At

.mJ/cm 9.2 = Iat area irradiated theof image visibleandt luminescen - 2,4

observed;not isAblation .mJ/cm 7.1 = Iat area

laser FEE-EUV by the irradiated theof image visibleandt luminescen -1,3(b)

absent. is zonen irradiatio in the

ablation that shows Squares 1mm.by shifted is plane focal when the

mJ/cm 5.3 = Iat area irradiated theof image visibleandt luminescen - 3,4

zone;ablation theshow Squares area. thisof image visible-2

plane; focal in the ),mJ/сJ 10.8 = Iintensity (laser

laser -Ag by the irradiated area, crystal LiF of imaget Luminescen-1(a)

2

2

2

2

2

mm. 5by shifted is plane Focal

J.11 b) J;3.5energy Pulse a)

.microscope force atomic theof use by the obtained

laser, FEE-EUV by the irradiated area, LiF theof msDensitogra

EE

n.irradiatiolaser ofintensity with the

depth ablation theof increase slow a show msDensitogra

nm. 40~ isdepth ablation , mJ/cm 150I b)

nm; 35~ isdepth ablation , mJ/cm 110 a)

:profile surface theof msdensitogra and

,microscope force atomic of use with theobtained

area, LiFlaser FEE-EUV by the irradiated theof Image

2

2

I

,3ereceimp

att

e nnD

In

t

,)()/(

0

000

x

upTT

t

n

D

I

t

Eeie

e

att

e

,)()/(

0

00

x

upTT

t

Eiie

i

,0

0

x

p

t

u

,

),(),( 0

00

t

txxtx ),(

),( 00

txut

txx

Equations of the hydrodynamic motion of matter

ions) -i electrons,-(e

re, temperatupressure, energy, internal ,, ,coordinate Lagrangian

velocity matter, ofdensity initial anddensity ,

factor, couplingphonon -electron- gap, band-

t,coefficienion recombinat frequency, ionizationimpact

depth,n attenuation irradiatio intensity,laser

energy,photon laser electrons, conduction ofion concentrat

0

0

TpEx

u

r

DI

n

recimp

att

e

Al and LiFfor isotherms) (zero curves Cold

Al and LiFfor curves adiabaticShock

Z"." curve by theshown also is mequilibriu ionizationin ) Z(degree Ionization

crystal.covalent partially in addition in phonons acoustical

account into ng with taki- ca, crystal, ionic in the phonons opticalonly account into ng with taki- i

: emperatureelectron t on the LiF of factor couplingphonon -electron of Dependence

e

e

T

T

s.dielectricin of valuessmall todue res temperatusmallat

volume)ofunit per sfer power tran ( in difference obviousan is There

(Al). metal a and

dielectric LiF of factor couplingphonon -electron of Comparison

Z

DYNAMICS OF HEATING AND EXPANSION OF LiF DYNAMICS OF HEATING AND EXPANSION OF LiF CRYSTALCRYSTAL

. pressure negativeinstant maximum theof valueabsolute and position gives

ps 5for profile pressure in themarker square The .mJ/cm 10

fluence and fs 300duration pulseith ablation w of regime threshold-near

in the pulse FEL-EUV ofaction after n wavecompressio ofFormation

2

L

tF

appear. pulse acoustic

minus" and plus"main behind 0p stretching second and 0n compressio Second

wave.stretching thebehindother whilen wave,compressio thebefore one :appear shocks Two

.mJ/cm 10 fs, 300 n wave,compressio of breaking ofresult a asshock of Appearance 2

p

FL

2L mJ/cm 180 fs, pulse, FEL-EUV strong of

actionafter edisturbanc acoustic powerful ofFormation

F

curves.near digits as written are valuesFluence .mJ/cm 10 case for the

strength material presents curve dashed The motion. substance

the todie is and between difference The nm. 9.7 nm, 10

GPa, 3.4 ps, 5 :are scoordinate Its marker. same by the marked

n wavescompressio of figure in the well theofpoint apex theto

scorrespond mJ/cm 10 profile in themarker square The

. coordinate Lagrangianon esdependenci give curves continuous The

2

lim

00

max

2

0max

F

p

xxxx

pt

F

xp

neg

neg

Thank you for Thank you for your attention!your attention!

Physics of Extreme States of Matter — 2011, Chernogolovka, 2011, p. 38-41Оптический журнал, 2011, 13, в. 8