Photorefractive Materials for Dynamic Optical Recording. Jaime Frejlich

) a...Figure 6.21 Self‐stabilized recording in the less‐oxidized crystal (sample LNB...Figure 6.22 Self‐stabilized recording in an oxidized crystal (sample LNB1) wit...Figure 6.23 Self‐stabilized recording in an oxidized crystal (sample LNB1) wit...Figure 6.24 Overall beam

produced by the interference of the recording beams...Figure 6.25 Measurement of the running hologram speed for the sample LNB1,

, Figure 6.26 Self‐stabilized recording on the same

:Fe sample (LNB3) with ordi...Figure 6.27 Recording setup stabilized on a nearby placed glassplate G, all ot...Figure 6.28 Glassplate‐stabilized experimental data for the recording on an ox...Figure 6.29 Mathematical simulation of non self‐stabilized recording with

. T...Figure 6.30 Evolution of

and scattering PSL during stabilized holographic re...

      7 Chapter 7Figure 7.1 Schema of the experimental setup for electro‐optic coefficient meas...Figure 7.2 Evolution of the absorption coefficient in an undoped

crystal (la...Figure 7.3 Light‐induced absorption: transmitted

versus incident

irradianc...Figure 7.4 Light‐induced absorption of undoped

(sample labeled BTO‐013) at

Figure 7.5 Absorption coefficient‐thickness

measured for three different BTO...Figure 7.6 Arrhenius curve dark conductivity for BTO:V. Data fitting to Eq. 7....Figure 7.7 Frequency‐dependence of the absolute value

in Eq. 7.12 for differ...Figure 7.8 Schematic setup for the electric measurement of photoconductivity. ...Figure 7.9 Typical crystal schema, in the so‐called “Transverse Configuration”...Figure 7.10 Photocurrent (in pA) as a function of the incident irradiance on t...Figure 7.11 (Left) Photograph of the wavelength‐resolved photoconductivity exp...Figure 7.12 Transverse configuration: coefficient σ on a logarithmic scal...Figure 7.13 Detailed view of Fig. 7.12 showing a strong increase in σ for...Figure 7.14 σ (s m/

) for thermally relaxed BTO:V (

) and pre‐exposed to Figure 7.15 Longitudinal configuration schema showing an externally polarized Figure 7.16 Lateral view of the sandwiched BTO crystal plate showing the light...Figure 7.17 Plotting of

with positive polarization (ranging from 0 to 500 V)...Figure 7.18 Light‐induced photoelectric conversion efficiency

measured (

) o...Figure 7.19 Comparative longitudinal

(without external applied field) (

) an...Figure 7.20

and

measured on an ITO‐sandwiched BTO with

mm and

mm under...Figure 7.21 Modulated photocurrent data of an undoped

crystal, with monochro...Figure 7.22 Plot of the Airy function (left), the equivalent Gaussian function...Figure 7.23 Plotting of

in the

plane, for

(left) and

(right).Figure 7.24 Schematic representation of an ac photocurrent produced by a sinus...Figure 7.25Figure 7.25 Stationary space‐charge field arising from a speckle pa...Figure 7.26 Plotting of

in the

plane for a speckle pattern of light vibrat...Figure 7.27 Simulation of the first harmonic photocurrent coefficient

(in ar...Figure 7.28 Simulation of the first harmonic photocurrent coefficient

as a f...Figure 7.29 Schematic representation of the experimental setup. A laser beam i...Figure 7.30 Optical sensor in metallic housing (from Fig. 7.29) showing the se...Figure 7.31Figure 7.31 Expanded front view of the photorefractive sensor housi...Figure 7.32 First harmonic photocurrent as function of reduced vibration ampli...Figure 7.33 Experimental first harmonic photocurrent

measured on a CdTe:V ph...

      8 Chapter 8Figure 8.1 Holographic setup: a laser beam is divided by the beamsplitter BS, ...Figure 8.2 Energy transfer between interfering

= 633 nm beams in the two‐wav...Figure 8.3 Exponential gain coefficient

as a function of the external incide...Figure 8.4 White light hologram erasure in

:Fe: The erasure data (

), measure...Figure 8.5 The graph shows the erasure of holograms in undoped BTO under 10–15...Figure 8.6 Hologram diffraction efficiency (arbitrary units) decay during

nm...Figure 8.7 Diffraction efficiency (

in arbitrary units) during erasure of a h...Figure 8.8 Erasure of holograms in Pb‐doped BTO (same sample as in Fig. 8.6) r...Figure 8.9 Diffraction efficiency (recorded and measured using

nm laser beam...Figure 8.10 Diffraction efficiency (au) as a function of time (seconds, in log...Figure 8.11 Hologram relaxation in the dark: exponential time as a function of...Figure 8.12 Photorefractive sensitivity S data (

) as a function of the extern...Figure 8.13 Second harmonic evolution for KNSBN:Ti for the same sample and exp...Figure 8.14 Evolution of the

accounting on self‐diffraction effects as de...Figure 8.15 Two‐wave mixing experiment in a photorefractive GaAs intrinsic cry...Figure 8.16 Second harmonic response curves for an undoped semi‐insulating GaA...Figure 8.17 Two‐wave mixing experiment in a photorefractive GaAs intrinsic cry...Figure 8.18 Two‐wave mixing experiment in a photorefractive GaAs intrinsic cry...Figure 8.19 Plot of the