Jaime Frejlich - Photorefractive Materials for Dynamic Optical Recording

6 Chapter 6Figure 6.1 Scanning electronic microscopy image of a 1D hollow sleeve structur...Figure 6.2 Scanning electronic microscopy image of a 2D‐array holographically ...Figure 6.3 Scanning electronic microscopy image of a blazed grating made by th...Figure 6.4 Block‐diagram of a self‐stabilized setup: Dphotodetector, LA‐...Figure 6.5 Schematic description of the actual self‐stabilized holographic rec...Figure 6.6 Schematic description of the effect of noise on the two‐wave mixing...Figure 6.7 Block‐diagram of fringe‐locked running hologram setup: same as for ...Figure 6.8 Schematic actual setup for self‐stabilized running hologram recordi...Figure 6.9 Fringe‐locked running hologram speed: Kv (rad/s) versus feedback am...Figure 6.10 Schema of the self‐stabilized setup in Fig. 6.8 modified to operat...Figure 6.11 Transverse optical configuration for holographic recording on BTO:...Figure 6.12 Self‐stabilized recording in a crystal: The upper figure shows t...Figure 6.13 Second harmonic evolution during holographic recording in a nomina...Figure 6.14 Experimental setup: BSbeamsplitter, C: :Fe crystal, Mmirror, PZ...Figure 6.15 Computed as a function of 2 from Eq. 6.53 for nonstabilized rec...Figure 6.16 Computed as a function of 2 and , for .Figure 6.17 Computed as a function of 2 and , for . The plane superimpo...Figure 6.18 Computed (in arbitrary units), with (that is, , ) as a functi...Figure 6.19 Computed evolution of ( ), ( ) in arbitrary units and ( ) as...Figure 6.20 Computed evolution of ( ), ( ) in arbitrary units, and ( ) 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 PSLduring 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...