Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optics Letters

Optical coherent transient header/data isolation technique

K.D. Merkel, William Randall Babbitt

Published Jan 1, 1996• 15 citations
Publisher

Abstract

We experimentally demonstrate a novel, all-optical technique that spatially isolates two parts of a temporally encoded optical information stream from each other by means of spatial-spectral holographic technology. A brief reference pulse is applied to an inhomogeneously broadened absorber [Tm(3+):YAG (0.1 at. %) at ~4.4 K] in the direction opposite that of the information stream, overlapping it on a boundary between the two temporal parts to be isolated (i.e., the header and the data). Another brief reference pulse subsequently applied in the opposite (the same) direction as that of the information stream results in an emitted optical output that mimicks only the part of the information stream that follows (precedes) the first reference pulse in a timeforward (time-reversed) fashion, completely isolated from the other part.

DOI
10.1364/ol.21.000071

Related papers

Temporal dependence of coherent transient regenerated true-time delays on intensity of applied pulses

K.D. Merkel, William Randall Babbitt

Summary form only given. Accurate true-time delays are essential to correctly steer modern phased-array antennas. Optical coherent transient technology has the ability to store a variable true-time delay as a spatial-spectral holographic population grating in an inhomogeneously broadened absorber (IBA). Typically, two optical pulses program the delay. A third optical pulse or waveform applied to the IBA generates a delayed replica of itself. The delay is typically defined by /spl tau//sub 21/=t/sub 2/-t/sub 1/, the arrival time difference of the first two pulses. However, we find that this prediction for the delay of the emitted signal only holds for input optical pulse areas much less than pi. Experimental investigation and simulations were performed to observe the variation in arrival time of the output signal.

Conference on Lasers and Electro-Optics•Jan 1, 1998•0 citations

Broadband true time-delay with optical coherent transients

Ming Tian, Randy R. Reibel, William Randall Babbitt

Summary form only given. When phased array antenna systems operate with broadband (multiple gigahertz) signals, true time-delay devices are needed to solve the problem of beam squint. Optical coherent transient technology, also known as spatial-spectral holography, offers a unique way of using the space and frequency dimensions of inhomogeneously broadened absorbers to handle thousands of high-resolution delays in a compact volume. We demonstrated broadband true-time delay in a Tm/sup 3+/:YAG crystal, which offers delays up to a microsecond on signals having several tens of GHz bandwidth with sub-picosecond delay resolution.

Conference on Lasers and Electro-Optics•Jan 1, 2001•0 citations

Four-dimensional temporal-spatial holograms

THOMAS W. MOSSBERG

In standard holographic applications, an object and a reference beam are simultaneously made incident on a recording material. Interference between these beams results in the storage of the spatial Fourier transform of the object pulse in the material. It is shown here that if the storage material is frequency selective (as in the case of inhomogeneously broadened absorbers), not only the spatial but also the temporal structure of the object pulse can be stored in and reconstructed from the material.

Conference on Lasers and Electro-Optics•Jan 1, 1982•0 citations

Optical Beam Routing through Time-Domain Spatial-Spectral Filtering

William Randall Babbitt, THOMAS W. MOSSBERG

Recent years have seen the development of a variety of techniques for the storage and processing of optical data streams in materials with [1-10] and without [11-12] intrinsic frequency selectivity. These techniques are characterized by very high bandwidth and relatively large time-bandwidth product. It is known, that the optical processes responsible for the storage and/or processing of temporal waveform data frequently also lead to the storage of spatial waveform information [13,14]. It has been demonstrated, for example, that sequences of images can be stored. [5,7,8] An area that is relatively unexplored, however, relates to the possible interactions between stored temporal and spatial information. We explore one example of how the temporal and spatial information stored within a material can interact and lead to a novel functionality, i. e. the passive routing of optical beams along one of many possible temporally encoded directions.

International Conference on Photonics in Switching•Jan 1, 1995•0 citations

Spectrally ordered Zeeman coherences and optical pulse-shape storage

N. W. Carlson, William Randall Babbitt, Yu Bai +1 more

We have experimentally investigated the creation of spectrally ordered nuclear and electronic Zeeman coherences in a gas-phase sample. A Zeeman coherence is generated through the sequential excitation of two coupled optical transitions. In our experiment, one transition was excited by a data pulse and the other by a short reference pulse. Subsequent excitation of one of these transitions by a short reading pulse transforms the Zeeman coherence into an optical coherence and leads to the emission of a time-forward or time-reversed duplicate of the data pulse. Output signals up to 5% as intense as the original data pulse were observed. We present a general analysis that is applicable to both gases and solids and find that the solid-state analog of this process will exist only if the inhomogeneous broadening of the two optical transitions is highly correlated.

Journal of the Optical Society of America B•Jun 1, 1985•18 citations

Coherent transient optical signal processing without brief pulses

K.D. Merkel, William Randall Babbitt

The temporal processing operations of convolution and correlation are demonstrated through optical coherent transient techniques, in which two long, low-intensity frequency-chirped pulses replace the single, brief reference pulse of a traditional three-pulse excitation sequence (brief pulse, pattern pulse, and data pulse). Here, a four-pulse excitation sequence is used (two frequency-chirped pulses, pattern pulse, and data pulse) in which the particular order and timing of the chirped pulses with respect to the other waveforms determine the processing operation. An experiment is performed with biphase-coded pattern and data pulses to demonstrate both the correlation and the convolution operations. A new atomic rephasing process that we call delayed rephasing is demonstrated.

Applied Optics•Jan 10, 1996•7 citations
We experimentally demonstrate a novel, all-optical technique that spatially isolates two parts of a temporally encoded optical information stream from each other by means of spatial-spectral holographic technology. A brief reference pulse is applied to an inhomogeneously broadened absorber [Tm(3+):YAG (0.1 at. %) at ~4.4 K] in the direction opposite that of the information stream, overlapping it on a boundary between the two temporal parts to be isolated (i.e., the header and the data). Another brief reference pulse subsequently applied in the opposite (the same) direction as that of the information stream results in an emitted optical output that mimicks only the part of the information stream that follows (precedes) the first reference pulse in a timeforward (time-reversed) fashion, completely isolated from the other part.
Summary form only given. Accurate true-time delays are essential to correctly steer modern phased-array antennas. Optical coherent transient technology has the ability to store a variable true-time delay as a spatial-spectral holographic population grating in an inhomogeneously broadened absorber (IBA). Typically, two optical pulses program the delay. A third optical pulse or waveform applied to the IBA generates a delayed replica of itself. The delay is typically defined by /spl tau//sub 21/=t/sub 2/-t/sub 1/, the arrival time difference of the first two pulses. However, we find that this prediction for the delay of the emitted signal only holds for input optical pulse areas much less than pi. Experimental investigation and simulations were performed to observe the variation in arrival time of the output signal.
Summary form only given. When phased array antenna systems operate with broadband (multiple gigahertz) signals, true time-delay devices are needed to solve the problem of beam squint. Optical coherent transient technology, also known as spatial-spectral holography, offers a unique way of using the space and frequency dimensions of inhomogeneously broadened absorbers to handle thousands of high-resolution delays in a compact volume. We demonstrated broadband true-time delay in a Tm/sup 3+/:YAG crystal, which offers delays up to a microsecond on signals having several tens of GHz bandwidth with sub-picosecond delay resolution.
In standard holographic applications, an object and a reference beam are simultaneously made incident on a recording material. Interference between these beams results in the storage of the spatial Fourier transform of the object pulse in the material. It is shown here that if the storage material is frequency selective (as in the case of inhomogeneously broadened absorbers), not only the spatial but also the temporal structure of the object pulse can be stored in and reconstructed from the material.
Recent years have seen the development of a variety of techniques for the storage and processing of optical data streams in materials with [1-10] and without [11-12] intrinsic frequency selectivity. These techniques are characterized by very high bandwidth and relatively large time-bandwidth product. It is known, that the optical processes responsible for the storage and/or processing of temporal waveform data frequently also lead to the storage of spatial waveform information [13,14]. It has been demonstrated, for example, that sequences of images can be stored. [5,7,8] An area that is relatively unexplored, however, relates to the possible interactions between stored temporal and spatial information. We explore one example of how the temporal and spatial information stored within a material can interact and lead to a novel functionality, i. e. the passive routing of optical beams along one of many possible temporally encoded directions.
We have experimentally investigated the creation of spectrally ordered nuclear and electronic Zeeman coherences in a gas-phase sample. A Zeeman coherence is generated through the sequential excitation of two coupled optical transitions. In our experiment, one transition was excited by a data pulse and the other by a short reference pulse. Subsequent excitation of one of these transitions by a short reading pulse transforms the Zeeman coherence into an optical coherence and leads to the emission of a time-forward or time-reversed duplicate of the data pulse. Output signals up to 5% as intense as the original data pulse were observed. We present a general analysis that is applicable to both gases and solids and find that the solid-state analog of this process will exist only if the inhomogeneous broadening of the two optical transitions is highly correlated.
The temporal processing operations of convolution and correlation are demonstrated through optical coherent transient techniques, in which two long, low-intensity frequency-chirped pulses replace the single, brief reference pulse of a traditional three-pulse excitation sequence (brief pulse, pattern pulse, and data pulse). Here, a four-pulse excitation sequence is used (two frequency-chirped pulses, pattern pulse, and data pulse) in which the particular order and timing of the chirped pulses with respect to the other waveforms determine the processing operation. An experiment is performed with biphase-coded pattern and data pulses to demonstrate both the correlation and the convolution operations. A new atomic rephasing process that we call delayed rephasing is demonstrated.