In Lippmann photography, the interference of the image with its reflection onto a mirror in contact with the photographic
emulsion allows, for each pixel of the image, the recording of Bragg gratings. Removing the mirror, processing the plate
and reading out these Bragg gratings with a white light source diffracts the very colours used for recording and thus
reproduces the images in colours. Using Lippmann photography as a data storage technique was proposed in the 1960th:
for a given pixel, and to each recording wavelength is associated one bit of data, several bits being recorded at the same
pixel. In this paper, we revisit this data storage technique and we propose and demonstrate an homodyne detection to
improve the efficiency of Lippmann data storages. The proposed homodyne geometry also presents the advantage to
simplify the architecture: the Lippmann mirror required for recording is kept in place for data retrieving. Such an
homodyne readout could also be applied to enhance the detected signals in other holographic approaches.
We have succeeded in continuous-wave laser oscillation on 4I13/2 → 4I15/2 transition of Er3+ ions around 1550 nm in microspheres fabricated with Erbium doped posphate "Schott" and silica "Baccarat" glasses. The microsphere lasers have been studied under pumping at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. Wavelength Red-shift effect of both fluorescence and laser spectra was experimentally observed in Er3+ doped phosphate glass when the pump power was increased, originating from thermal effects.
Er3+ / Yb3+ co-doped phosphate glass and Er3+ : ZBLALiP fluoride glass microsphere lasers have been studied under pumping by a fiber taper at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. Red-shift effect on the wavelengths of both fluorescence and laser spectra
is experimentally observed when the pump power is increased, originating from thermal effects. We showed coupling effect between microspherical laser and an external cavity made by a metallic mirror. We observed line shift to lower wavelengths due to optical feedback effect.
Er3+/Yb3+ co-doped phosphate glass microsphere lasers have been studied under pumping by a fiber taper at 1480 nm. Whispering Gallery Mode laser spectra were analyzed for different sphere diameters. The gain spectrum is calculated for the transition 4I13/2 → 4I15/2 around 1550 nm. Red-shift effect on the wavelengths of both fluorescence and laser spectra is experimentally observed when the pump power is increased, originating from thermal effects. We showed coupling effect between microspherical laser and an external cavity made by a metallic mirror. We observed line shift to lower wavelengths due to optical feedback effect.
We report on passive micro-resonator numerical simulations. These structures present a potential functionality in wavelength division access network. We study the influence of the gap between the micro-resonator and the coupling device. We show that greater than 75% optical power transfer to the drop port is enabled in polymer micro-ring by use of a dual-taper coupling method.
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