The Experts below are selected from a list of 6303 Experts worldwide ranked by ideXlab platform
R L Cone - One of the best experts on this subject based on the ideXlab platform.
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laser linewidth narrowing using transient spectral Hole Burning
Journal of Luminescence, 2014Co-Authors: C W Thiel, R L Cone, Thomas OttgeAbstract:Abstract We demonstrate significant narrowing of laser linewidths by high optical density materials with inhomogeneously broadened absorption. As a laser propagates through the material, the nonlinear spectral Hole Burning process causes a progressive self-filtering of the laser spectrum, potentially reaching values less than the homogeneous linewidth. The transient spectral Hole dynamically adjusts itself to the instantaneous frequency of the laser, passively suppressing laser phase noise and side modes over the entire material absorption bandwidth without the need for electronic or optical feedback to the laser. Wide bandwidth laser phase noise suppression was demonstrated using Er3+ doped Y2SiO5 and LiNbO3 at 1.5 μm by employing time-delayed self-heterodyne detection of an external cavity diode laser to study the spectral narrowing effect. Our method is not restricted to any particular wavelength or laser system and is attractive for a range of applications where ultra-low phase noise sources are required.
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optical decoherence and persistent spectral Hole Burning in er3 linbo3
Journal of Luminescence, 2010Co-Authors: C W Thiel, R L Cone, R M Macfarlane, Thomas Bottger, Yongchen Sun, William R BabbittAbstract:Abstract Developing new resonant optical materials for spatial-spectral holography and quantum information applications requires detailed knowledge of the decoherence and population relaxation dynamics for the quantum states involved in the optical transitions, motivating the need for fundamental material studies. We report recent progress in studying these properties in erbium-doped lithium niobate at liquid helium temperatures. The influence of temperature, applied magnetic fields, measurement timescale, and dopant concentration were probed using photon echo spectroscopy and time-resolved spectral Hole Burning on the 1532 nm transition of Er 3+ :LiNbO 3 . Effects of spectral diffusion due to interactions between Er 3+ ions and between the Er 3+ ion and 7 Li and 93 Nb nuclear spins in the host lattice were observed. In addition, long-lived persistent spectral storage of seconds to minutes was observed due to non-equilibrium population redistribution among superhyperfine states.
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recent progress in developing new rare earth materials for Hole Burning and coherent transient applications
Journal of Luminescence, 2002Co-Authors: Y Sun, C W Thiel, R L Cone, R W Equall, R L HutchesonAbstract:To develop new spectral Hole Burning materials and optimize known materials for applications such as optical correlator and memory devices, a broad range of experiments, from optical coherent transients to photoelectron spectroscopy, have been used to elucidate fundamental aspects of the rare-earth electronic structure. We report progress in the characterization of Er 3+ doped materials where we have measured an ultra-narrow line width of 50Hz in Er 3+ :Y 2 SiO 5 and a Γ inh /Γ h ratio as high as 10 8 in Er 3+ :LiNbO 3 . Progress is also reported for Nd 3+ :YVO 4 where the high oscillator strength is an advantage over other rare earth ions and excellent coherence properties can be achieved at modest magnetic fields. Finally, we report the advances in the pursuit of photon-gated Hole Burning materials through the study of the energies of the localized rare earth energy states relative to the host band states, providing the foundation for understanding photoionization in these materials.
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laser stabilization at 1536 nm using regenerative spectral Hole Burning
Physical Review B, 2001Co-Authors: Peter B Sellin, N M Strickland, Thomas Bottger, J L Carlsten, R L ConeAbstract:Laser frequency stabilization giving a 500-Hz Allan deviation for a 2-ms integration time with drift reduced to 7 kHz/min over several minutes was achieved at 1536 nm in the optical communication band. A continuously regenerated spectral Hole in the inhomogeneously broadened ${}^{4}{I}_{15/2}{(1)}^{4}{I}_{13/2}(1)$ optical absorption of an ${\mathrm{Er}}^{3+}:{\mathrm{Y}}_{2}{\mathrm{SiO}}_{5}$ crystal was used as the short-term frequency reference, while a variation on the locking technique allowed simultaneous use of the inhomogeneously broadened absorption line as a long-term reference. The reported frequency stability was achieved without vibration isolation. Spectral Hole Burning frequency stabilization provides ideal laser sources for high-resolution spectroscopy, real-time optical signal processing, and a range of applications requiring ultra-narrow-band light sources or coherent detection; the time scale for stability and the compatibility with spectral Hole Burning devices make this technique complementary to other frequency references for laser stabilization.
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laser frequency stabilization using regenerative spectral Hole Burning
Physical Review B, 2000Co-Authors: N M Strickland, Peter B Sellin, J L Carlsten, Yongchen Sun, R L ConeAbstract:We demonstrate laser frequency stabilization using a continuously regenerated transient spectral Hole in an inhomogeneously broadened resonance of a solid. Regenerative transient Holes provide extreme stabilization for time scales appropriate for spectroscopy, signal processing, ranging, and interferometry. Stabilization to 20 Hz on a 10-ms time scale using spectral Holes at 793 nm in ${\mathrm{Tm}}^{3+}{:\mathrm{Y}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_{12}$ gives substantial improvement in the reliability of stimulated photon echoes in the same material and enables the observation of a third population storage mechanism for Hole Burning in ${\mathrm{Tm}}^{3+}{:\mathrm{Y}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_{12}.$
Govind P Agrawal - One of the best experts on this subject based on the ideXlab platform.
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effects of spatial Hole Burning on gain switching in vertical cavity surface emitting lasers
IEEE Journal of Quantum Electronics, 1997Co-Authors: S Y Law, Govind P AgrawalAbstract:We present a numerical study of the effects of carrier diffusion and spatial Hole-Burning in vertical-cavity surface-emitting lasers under gain switching. Our model includes spatial and temporal dependences of both the optical field and the carrier density. Results show that spatial Hole Burning places a limit on the minimum achievable pulse width. We demonstrate that spatial Hole-Burning tan be avoided and shorter pulses can be obtained by using an appropriate pumping geometry. We also consider the case in which the laser operates simultaneously in two transverse modes and show that transverse-mode competition induced by spatial Hole Burning leads to period doubling and other interesting nonlinear behavior.
J S Smith - One of the best experts on this subject based on the ideXlab platform.
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spatial Hole Burning and self focusing in vertical cavity surface emitting laser diodes
Applied Physics Letters, 1994Co-Authors: G C Wilson, D M Kuchta, J D Walker, J S SmithAbstract:We measure spatial Hole Burning in weakly index guided vertical‐cavity surface‐emitting laser diodes (VCSELs) by spatially and spectrally resolving the spontaneous emission near field above threshold and show that spatial Holes produce a significant lensing effect. We demonstrate experimentally, and with a simple model, that in weakly index guided VCSELs, self‐focusing causes the fundamental mode width to decrease with increasing output power, exacerbating the spatial Hole Burning problem and inducing a transition to multimode operation at relatively low powers.
William R Babbitt - One of the best experts on this subject based on the ideXlab platform.
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optical decoherence and persistent spectral Hole Burning in er3 linbo3
Journal of Luminescence, 2010Co-Authors: C W Thiel, R L Cone, R M Macfarlane, Thomas Bottger, Yongchen Sun, William R BabbittAbstract:Abstract Developing new resonant optical materials for spatial-spectral holography and quantum information applications requires detailed knowledge of the decoherence and population relaxation dynamics for the quantum states involved in the optical transitions, motivating the need for fundamental material studies. We report recent progress in studying these properties in erbium-doped lithium niobate at liquid helium temperatures. The influence of temperature, applied magnetic fields, measurement timescale, and dopant concentration were probed using photon echo spectroscopy and time-resolved spectral Hole Burning on the 1532 nm transition of Er 3+ :LiNbO 3 . Effects of spectral diffusion due to interactions between Er 3+ ions and between the Er 3+ ion and 7 Li and 93 Nb nuclear spins in the host lattice were observed. In addition, long-lived persistent spectral storage of seconds to minutes was observed due to non-equilibrium population redistribution among superhyperfine states.
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spectral Hole Burning for wideband high resolution radio frequency spectrum analysis
Optics Letters, 2005Co-Authors: Friso Schlottau, Max Colice, Kelvin H Wagner, William R BabbittAbstract:We present experimental results for what is to our knowledge the first spectral-Hole-Burning based rf spectrum analyzer to cover 10 GHz of rf analysis bandwidth. The rf signal of interest is modulated onto an optical carrier, and the resultant optical sidebands are burned into the inhomogeneously broadened absorption band of a Tm3+:YAG crystal. At the same time a second, frequency-swept laser reads out the absorption profile, which is a double-sideband replica of the rf spectrum, and thus the rf spectrum can be deduced after spectral calibration of the nonlinear readout chirp. This initial demonstration shows spectral analysis covering 10 GHz of bandwidth with >5500 spectral channels and provides 43 dB of dynamic range.
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rf spectrum analysis in spectral Hole Burning media
on Optical information systems, 2004Co-Authors: Max Colice, Ivan Lorgeré, Friso Schlottau, Kelvin H Wagner, Krishna R Mohan, William R Babbitt, Jean-louis Le GouëtAbstract:We propose a novel, wideband spectrum analyzer based on spectral Hole Burning (SHB) technology. SHB crystals contain rare earth ions doped into a host lattice, and are cooled to cryogenic temperatures to allow sub-MHz Hole Burning linewidths. The signal spectrum is recorded in an SHB crystal by illuminating the crystal with an optical beam modulated by the RF signal of interest. The signal's spectral components excite those rare earth ions whose resonance frequencies coincide with the spectral component frequencies, engraving the RF spectrum into the crystal's absorption profile. Probing this altered absorption profile with a low power, chirped laser while measuring the transmitted intensity results in a time-domain readout of the accumulated RF signal spectrum. The resolution of the spectrum analyzer is limited only by the homogeneous linewidth of the rare earth ions ( 20 GHz.
S Y Law - One of the best experts on this subject based on the ideXlab platform.
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effects of spatial Hole Burning on gain switching in vertical cavity surface emitting lasers
IEEE Journal of Quantum Electronics, 1997Co-Authors: S Y Law, Govind P AgrawalAbstract:We present a numerical study of the effects of carrier diffusion and spatial Hole-Burning in vertical-cavity surface-emitting lasers under gain switching. Our model includes spatial and temporal dependences of both the optical field and the carrier density. Results show that spatial Hole Burning places a limit on the minimum achievable pulse width. We demonstrate that spatial Hole-Burning tan be avoided and shorter pulses can be obtained by using an appropriate pumping geometry. We also consider the case in which the laser operates simultaneously in two transverse modes and show that transverse-mode competition induced by spatial Hole Burning leads to period doubling and other interesting nonlinear behavior.