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Proceedings ArticleDOI

Spatial dynamics of picosecond CO 2 laser pulses produced by optical switching in Ge

TL;DR: In this paper, the design, test and optimization of a picosecond CO2 pulse-forming system is presented, where the system switches a semiconductor's optical characteristics at 10 1 am under the control of a synchronized 1.06-jim Nd:YAG laser pulse.
Abstract: The design, test and optimization of a picosecond CO2 pulse-forming system are presented. The system switches a semiconductor's optical characteristics at 10 1um under the control of a synchronized 1.06-jim Nd:YAG picosecond laser pulse. An energy-efficient version of such a systemusing collimated beams is described. A simple, semi-empirical approach is used to simulate theswitching process, specifically including the spatial distributions of the laser energy and phase,which are relevant for experiments in laser-driven electron acceleration. 1. INTRODUCTION Lasers have been proposed as a tool for electron acceleration since early in their develop- ment. But only with the advent of sufficiently high-power lasers has this idea become feasible, andresearch programs are under way in several laboratories. The Accelerator Test Facility (ATF)1at Brookhaven National Laboratory (BNL) is presently preparing to test three laser-acceleration schemes. In all cases, the laser will interact with a 50 MeV high-brightness e-beam producedby a conventional RF linear accelerator. One program investigates electron acceleration by the
Citations
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Journal ArticleDOI
TL;DR: In this paper, a semiconductor switching technique has been used to produce 30-300 ps variable duration CO/sub 2/ laser pulses of 0.5-MW peak power.
Abstract: A semiconductor switching technique has been utilized to produce 30-300 ps variable duration CO/sub 2/ laser pulses of 0.5-MW peak power. Eight passes through a 1.2-m long, UV-preionized, 3-atm TE CO/sub 2/ amplifier raise the output laser peak power to the 10/sup 10/ W level. Sampling the amplifier gain in linear and saturated regimes using CO/sub 2/ laser radiation ranging from CW to 30 ps pulse length permits comparison with computer modeling of picosecond CO/sub 2/ pulse amplification. The potential for further peak power scaling of picosecond molecular lasers is discussed. >

31 citations

Journal ArticleDOI
TL;DR: In this paper, a superatmospheric pressure CO2-amplifier with a 5 cm interelectrode gap and a gaseous medium pressure up to 5 atm was proposed for active medium excitation by soft X-ray preionized self-sustained discharge.
Abstract: The paper discusses the problem of developing superatmospheric pressure CO2-amplifiers intended to amplify picosecond light pulses. The advantages of the systems for active medium excitation by a soft X-ray preionized self-sustained discharge are demonstrated. The characteristics of the CO2-amplifier with a 5 cm interelectrode gap and a gaseous medium pressure up to 5 atm are presented.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the basic characteristics and photogenerated plasma behavior of the reflection switch are discussed and a model is proposed to explain the observed time resolved and integrated reflectivity.
Abstract: We report on a study of optically induced transient infrared reflectivity at 10.6 /spl mu/m of a GaAs wafer. The basic characteristics and the photogenerated plasma behavior of the reflection switch are discussed. A model is proposed to explain the observed time resolved and integrated reflectivity. Here, diffusion and a two body recombination mechanism whose rate is taken to be dependent on the carrier density, are used to model the plasma evolution. The experimental observations are found to be consistent with the model. >

4 citations

Patent
24 Nov 1992
TL;DR: In this paper, the authors describe a system that uses a physical measurement of a wavefront that has been altered in a known manner to slice off a portion of the removed portion and send the sliced portion to a measuring device for physical measurement.
Abstract: An ultra short (<10 ps), high power laser pulse is temporally characterized by a system that uses a physical measurement of a wavefront that has been altered in a known manner. The system includes a first reflection switch to remove a portion of a pulse from a beam of pulses, then includes a second reflection switch, operating in a mode that is opposite to the first reflection switch, to slice off a portion of that removed portion. The sliced portion is then directed to a measuring device for physical measurement. The two reflection switches are arranged with respect to each other and with respect to the beam of ultra short pulses such that physical measurement of the sliced portion is related to the temporal measurement of the ultra short pulse by a geometric or trigonometric relationship. The reflection switches are operated by a control pulse that is directed to impinge on each of the reflection switches at a 90° angle of incidence.

3 citations

Journal ArticleDOI
TL;DR: An all-optical time-division demultiplexer system is proposed that employs semiconductor switching and can be applied through the use of input infrared signals of wavelengths ≥1 µm.
Abstract: An all-optical time-division demultiplexer system is proposed that employs semiconductor switching. The technique can be applied through the use of input infrared signals of wavelengths ≥1 µm. The device is simple to construct and has a potential capacity of 1 Tbit/s, with cross talk between channels of only approximately -13 to -17 dB at operating wavelengths between 1 and 15 µm, respectively. The optimum characteristics and the operational parameters are also presented.

3 citations