keV HHG and Sub femtosecond K-shell excitation. PowerPoint Presentation, PPT - DocSlides

keV  HHG and Sub femtosecond K-shell excitation. PowerPoint Presentation, PPT - DocSlides

2016-04-09 47K 47 0 0

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. ( . using IR (2.1. . m) Radiation Source. . ). Gilad Marcus. The Department of Applied Physics. , . The Hebrew Universit. y, Jerusalem, Israel. . Tel Aviv, 2-4, December 2013. Acknowledgment. ID: 277426

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Presentations text content in keV HHG and Sub femtosecond K-shell excitation.

Slide1

keV

HHG and Sub femtosecond K-shell excitation. ( using IR (2.1m) Radiation Source )

Gilad MarcusThe Department of Applied Physics, The Hebrew University, Jerusalem, Israel

Tel Aviv, 2-4, December 2013

Slide2

Acknowledgment

Xun

Gu

1

Wolfram

Helml 1

Yunpei

Deng 1

Ferenc Krausz 1Reinhard Kienberger 1 Robert Hartmann 2 Takayoshi Kobayashi 3 Lothar Strueder 4

Max Planck, Quantum Optic, Germany

pnSensor

GmbH, Germany

University of Electro-Communications,

Chofu

, Tokyo, Japan

Max Planck, Extraterrestrial Physics, Germany

Slide3

Currently, the photon energy of atto-second pulses is limited to ~150 eV ( l~8 nm). Pushing the HHG toward the x-ray regimeShorter attosecond pulses Access to the water-window (300-500 eV) Time resolved spectroscopy of inner-shell processesX-ray diffraction imaging with a better resolutionRe-colliding electrons with higher energiesLaser induced diffraction imaging with better resolution

Motivation for

keV

HHG

Slide4

Increasing the energy of the re-colliding electrons

I (PW/cm2)0.150.51.0λ (nm)800210080021008002100Up (eV)9.061.83020660412ħωmax (eV)442111106682051321

By using

a longer

wavelength

w

e can overcome the ionization

problem

Currently, the photon energy of

atto

-second pulses is limited to ~150

eV

(

l

~8 nm).

Slide5

The 2-cycles IR source

15 fsec

740 µJ

1 kHz

Self CEP Stabilization

n

m

Slide6

OPA system output:

Carrier wave-length:

l=

2.1

mmPulse duration: 15.7 fs (2 cycles)Pulse energy: 0.7 mJRep rate: 1000 Hz Automatically Carrier-envelope-phase-stabilized

wavelength, nm

f-to-3f interferogram

2 cycles IR (2.1mm) source

Long term (few hours) phase scan

B.Bergues

, et. al,

New Journal of Physics

13, no. 6 ( 2011): 063010.

I.

Znakovskaya

, et al. PRL 108, no. 6 (2012): 063002.

Slide7

High Harmonic Generation

Slide8

THG FROG

compressor

(bulk silicon)

Diagnostics for pulse

compression measurement

THG FROG

focusing lens

(CaF2, 250 mm)

High harmonic beam from N

2

through 150nm Pd +500nm C

Ne/N

2

gas target,

pressure

up to 3 bar!

PN

Camera

keV

high harmonics and K-shell excitation

Slide9

THG FROG

compressor

(bulk silicon)

Diagnostics for pulse

compression measurement

THG FROG

focusing lens

(CaF2, 250 mm)

keV

high harmonics and K-shell excitation

High harmonic beam from N

2

through 150nm Pd +500nm C

Ne/N

2

gas target,

pressure

up to 3 bar

!

PN

Camera

Slide10

Photon counting and photon’s energy resolving with the

pnCCD

Two photons hittingtwo pixels.The charge in each pixel is proportionalto the photon energy

Slide11

Photon counting and photon’s energy resolving with the

pnCCD

Charge from one photons, spilled into neighboring pixels

Slide12

Photon counting and photon’s energy resolving with the

pnCCD

Rejected as an error.Not a reasonable charge distribution

Cosmic ray trace

Slide13

keV

high harmonics and K-shell excitation

High harmonics spectrum

from a neon gas target

through 500nm aluminum

Same spectrum through additional 500nm of vanadium (a) or iron (b)

Vanadium L-edge

Iron L-edge

1.6 keV

Cut off

G. Marcus, et. al,

PRL

108

,

023201.

Slide14

Photon counting and photon’s energy resolving with the

pnCCD

Two photons hitting

two pixels.The charge in each pixel is proportionalto the photon energy

Slide15

Photon counting and photon’s energy resolving with the

pnCCD

Slide16

Real spectrum

Two pixels

pseudo photons

Slide17

keV

high harmonics and K-shell excitation

High harmonics spectrum

from a neon gas target

through 500nm aluminum

Same spectrum through additional 500nm of vanadium (a) or iron (b)

Vanadium L-edge

Iron L-edge

1.6 keV

Cut off

G. Marcus, et. al,

PRL

108

,

023201.

Slide18

keV high harmonics and K-shell excitation

Slide19

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Better phase matching conditions

due to the absorption lines

Inner shell excitation followed

by x-ray

emission

Slide20

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Calculation shows: Plasma

dispersion still dominate

Inner shell excitation followed

by x-ray

emission

Slide21

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Inner shell excitation followed

by x-ray fluorescence

Slide22

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Inner shell excitation followed

by x-ray fluorescence

2D

Slide23

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Inner shell excitation followed

by x-ray fluorescence

2D

Slide24

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Inner shell excitation followed

by x-ray fluorescence

2D

Slide25

keV high harmonics and K-shell excitation

Enhanced peak at the K-edge

Inner shell excitation followed

by x-ray fluorescence

2D

Slide26

keV high harmonics and K-shell excitation

Inner shell excitation followed

by x-ray fluorescence

Slide27

Thank you

Slide28

Slide29

Slide30

Slide31

Slide32

Slide33


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