Exploring the limits of optical storage using persistent spectral hole-burning: holographic recording of 12000 images

Spectral hole burning in naphthalocyanines derivatives in the region 800nm for holographic storage applications

“…At this intensity, we observed a homogeneous line broadening &1 GHz for the samples mentioned above. A pathlength di!erence of 14 cm between the reference and signal arm allows a phase shift of 2 ( ¸/c) when the laser is shifted in frequency by "1 GHz [1]. This phase shift is used to cancel the absorption grating and reveals only an index grating in the center of the burning frequency through the Kramers}Kronig relations [12,13].…”

“…A persistent spectral hole burning (PSHB)-based memory has the potential of ultrahigh storage density (Tbyte/cm) in polymer-based materials. Recently, the recording of 12,000 holograms in one spatial location using frequency multiplexing around 634 nm has been demonstrated in chlorine-doped polyvinyl butyral "lms [1]. To access holograms stored in the medium, the laser source is tuned to the corresponding wavelength used to record the hologram.…”

Persistent spectral hole-burning in a -doped aluminosilicate glass from 8 to 295 K: Study of the burning and refilling kinetics, and of optical dephasing

“…In the case of vitreous silica, they have been assigned to rotations of SiO 4 tetrahedra [41]. As can be seen in Figure 8, our experimental data for the temperature dependence of both the homogeneous linewidth and frequency shift can be fitted according to equations (7,8) assuming a narrow pseudo-local phonon distribution centered around ∼ 50 cm −1 for the spectral density of modes. These phonon frequencies are close to frequencies of vibrations obtained experimentally in [41].…”

“…In the case of rare-earth ions, this ratio may be larger than 10 7 at low temperature. Recently, using an organic molecule doped in a polymer matrix, a storage density of at least 10 10 bits per cm 2 has been demonstrated [8], which compares well with conventional memories. However, this PSHB result was obtained at 1.7 K. When the temperature is increased, two problems arise.…”

Spectroscopy, persistent hole burning, and holographic applications of naphtophthalocyanine/haloanthracene systems

“…An important application of PSHB media is holographic ultra-high density optical storage. Recently, the recording of 12,000 holograms at a single location by frequency multiplexing has been demonstrated [6]. Combining angle and frequency multiplexing can further increase the storage capacity.…”