ì”0§v˛c$xX@àkʦéêÚUmšûDÚUš5°|−„

Coherent control of laser-induced

plasma waveguides and plasma waves

by spatial-temporal femtosecond

waveform shaping

February 19, 2002

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1 ¬ A‹D*��Ü 1

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1.2 ʦ��Ú䋧 . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Xmʦ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 ŸÜ� j¶� Dñ™ 10

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2.5 Xmʦí��D¿¾ . . . . . . . . . . . . . . . . . . . . . . 17

2.6 û˝j¶DÏW¥� . . . . . . . . . . . . . . . . . . . . . . . 20

3 ã‚êA�TáñDA‹ 22

3.1 �ø�ã‚êA�Táñ . . . . . . . . . . . . . . . . . . . . 22

3.2 �ù�ã‚êA�Táñ . . . . . . . . . . . . . . . . . . . . 22

3.3 �ú�ã‚êA�Táñ . . . . . . . . . . . . . . . . . . . . 22

3.4 ã‚A‹ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.5 ¡D�TAº5o* . . . . . . . . . . . . . . . . . . . . . . . 23

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1

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ð�DÕä�£í9Ï� Í(Bb¨7ø¶ 25 fs\��_î�£ù(Ti:sapphire)ʦPÓÂ, wéêmÄu5qIä5>Ÿ|¦ (Nd:YVO4) ʦ, �|ä ® 40

1

2

10-terawatt laser system block diagram

VacuumCompressor

ExperimentalChamber

Third StageAmplifier4-pass

(2.8-J, 532-nmpump)

Pockels CellPulse Cleaner

VacuumSpatial Filter

Beam Expander

Second Stage4-pass Amplifier

(450-mJ532-nm pump)

Beam Expander Energy Tuner

Spatial Filter

RegenerativeAmplifier

(20-mJ,532-nm pump)

Pulse Stretcher

FemtosecondOscillator(CW 2.5-W,

pump)532-nm

SmallSpatial Filter

optical diagnosis

Third OrderAutocorrelator

Beam ProfilerSingle-shot

FROG

AutocorrelatorSpectrometer

1.0 nJ200 ps

805 nm1.5 mJ, 200 ps

100 mJ200 ps

95 mJ200 ps

808 nm120 mJ, 190 ps

810 nm1.1 J, 200 ps

810 nm, 550 mJ55 fs, 10 TW

797 nm1.5 nJ, 25 fs

Ç 1.1: �q?�òŠ0�s0§Ê¦Í$º0Ç�

nm� âk|(bDõðÍ$©!, BbíʦÍ$̶¨Ê−ª�ífËmçA

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x�GßíJ}‰� ¿t2éýBbA`íʦPÓÂüõx�iGí ì4, ©/�Tb�üvîªJ\M ìí�|, ©U6ÉÛb.ƒøüví&ˆ\ô�

wŸBb¨7 Offner triplet Z�5ÌHóÏr¥¦�0§ô� [22], ªø

ʦ0§ív …ÅB 200 ps� ¤Z�50§ô�Â.UàNŸ�¡N�mçjK,FJ.}ÄùpçÕí‡eHà7û_0§Ì¶êr9ò�

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)0§v ?D9ò�Ÿ…�p5 �Cys� Í7ÊõÒíÍ$52, âkʦ

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3

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4

energy

standard deviation = 1%

even

ts

0.96

40

0.97 0.98 0.99 1.00

30

20

10

0

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6

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7

line-focusedpump pulse

solid target

hot plasma

x-raypulse

pumppulse

gas target

(a)

hot plasma

x-raypulse

(b)

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8

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9

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10

11

position

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position

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12

outputwavefront

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incomingwavefront

micro-lens array

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13

line focus in a plasma waveguide formation

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prepulse

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tointerferometer

probepulse

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14

side view

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15

acoustic wave

inputpulse

fast ordinary axis(mode 1)

slow extraordinary axis(mode 2)

shapedpulse

Ç 2.7: AOPDF «TŸÜý<Ç�

plasma densityperturbation

incident pulseintensity

moldulated pulseintensity

plasma wave

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ward scattering 1�¤R�ÚUšPÓ [41] (Ç 2.8), ¥j�F��íÚUšú

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16

laser pulse

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J±Q��0§í#�, Áý7Í$2Ý(4^@Fù–í. ì4� ĤBbl

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17

pump pulse

probe pulse

plasma wave

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pump pulsedouble probepulse

plasma wave

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18

entranceslit

imageplane

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(a)

sphericalgrating

entranceslit

Rowlandcircle

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aperiodic sphericalgrating

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19

0.0

0.2

0.4

0.6

0.8

1.0

0 20 40 60 80

wavelength (nm)

tran

smitt

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1- m Al filterµ

0.0

0.2

0.4

0.6

0.8

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wavelength (nm)

tran

smitt

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0 5 10 15 20 25

1- m B filterµ

wavelength (nm)0 5 10 15 20 25

0.0

0.2

0.4

0.6

0.8

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smitt

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1- m Be filterµ

(a) (b)

(c)

Ç 2.13: Xm˙Ò¡N0: (a) 1.0-µm ¾½˙Ò, (b) 1.0-µm ¾−˙Ò, (c) 1.0-µm¾‘˙Ò�

˙ÎÆm� úklå¨í·−DG− X mʦ, BbøUà“½”˙ÒVhô‡6

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20

gas jet

photo-electron

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x-ray pulse

referencepulse

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ªJ)ƒù65>ŒóßmU, 7j) X m0§5v � ĤÎ7Ÿ…àkßÞÚ

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21

Shack-Hartmanndetector

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3

ã‚êA�TáñDA‹

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22

23

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