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Contents. 1.   Mechanisms of ultrafast light-matter interaction A.  Dipole interaction B.   Displacive excitation of phonons C.  Impulsive stimulated Raman and Brillouin scattering D.   Scattering and Diffraction 2.  Ultrafast optical-frequency methods A.   Ellipsometry

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Contents

Contents

1.  Mechanismsof ultrafast light-matter interaction

A.  Dipole interaction

B.  Displaciveexcitationofphonons

C.  Impulsive stimulated Raman andBrillouinscattering

D.  ScatteringandDiffraction

2.  Ultrafast optical-frequencymethods

A.  Ellipsometry

B.  Broadband techniques

C.  Harmonicgeneration

D.  Fluorescence

E.  2-D Spectroscopies

3.  THz-frequencymethods

A.  Mid-IR andTHzinteractionswithsolids

B.  Differencefrequencymixing

C.  Optical rectification

4.  Ultrafast VUV and x-rayfrequencymethods

A.  Photoemissionspectroscopy

B.  X-rayabsorptionspectroscopies

C. Coherentimaging

D.  X-raydiffraction

5.  Electronbasedmethods

A.  Ultrafast electrondiffraction

B.  Electronspectroscopies


Time scales in solid state physics

Time scales in solid statephysics

Opticalcommunication

Magnetic

recording

High harmonic

generation

Micro electronics

Ti: Saphire lasers

10ns

1ns

100fs

10fs

1fs

100ps

10ps

1ps

Latticevibrations

Ferromagnetic

resonance

Ultrafast

demagnetization

Excitation of

an atom

Recombination of

Electron hole pairs

Thermali-zation


The solid and its excitations

tp<1 ps

te < 0.1ps

tel ~ 1 ps

Electrons

Phonons

Tsl ~ 100 ps?

Tes = ?

ts

Spin

The solid and its excitations


The solid and its excitations1

tp<1 ps

te < 0.1ps

tel ~ 1 ps

Electrons

Phonons

Tsl ~ 100 ps?

Tes = ?

ts

Spin

The solid and its excitations


Fast detector or fast source

Fast light source

Slow detector

Fast detector or fast source

Slow light source

Fast detector


Pump probe technique stroboscopic needs repeatable process

pump & probe technique: stroboscopic, needs repeatable process!

time base

pump

adjustable

delay

No cats were harmed in our experiments!

probe

Courtesy of A. Kirilyuk, U Delft


Pump probe techniques

Pump-Probe techniques


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