Showing papers on "Femtosecond pulse shaping published in 1979"
TL;DR: In this article, the advantages and limitations of combined backward wave Raman pulse compression and pulse stacking for inertial fusion applications are discussed, and a description of the major technological limitations which drive the designs of large (200 kJ) systems and some nominal systems parameters for a terawatt prototype stacker-compressor laser system are given.
Abstract: The advantages and limitations of combined backward wave Raman pulse compression and pulse stacking for inertial fusion applications are discussed. A description of the major technological limitations which drive the designs of large (200 kJ) systems and some nominal systems parameters for a terawatt prototype stacker-compressor laser system are given. It is shown that aviable short wavelength laser fusion driver employing this concept can be expected to provide an overall power multiplication of 50 with a total systems efficiency of over 3 percent.
91 citations
TL;DR: In this article, an alternative interpretation for the exponential shapes of the second harmonic autocorrelation functions obtained from synchronously pumped mode-locked dye laser systems is presented, based on a weighted average of pulses of varying widths and smoothly varying pulse shapes in time.
77 citations
TL;DR: In this article, a background-free measurement of an individual pulse of a passively mode-locked Nd: glass laser during one laser shot has been performed using a crystal of LiIO3.
70 citations
TL;DR: An experimental investigation of a passive pulse-shaping system capable of producing optical pulses of arbitrary temporal profile on the subnansecond time scale is described, and several results are included.
Abstract: A passive pulse-shaping system capable of producing optical pulses of arbitrary temporal profile on the subnansecond time scale is described and analyzed. The system uses a pair of gratings in a delay line and various filtering operations. An experimental investigation of the system is described, and several results are included.
64 citations
TL;DR: Strong dispersion as a limiting influence upon compression of linearly chirped pulses is examined for the grating pair at several laser wavelengths.
Abstract: An optical pulse compression medium formed by two parallel gratings can be strongly dispersive if the diffracted beam emerges at grazing angle from the surface of the first grating. Strong dispersion makes possible temporal compression of broad incident pulses. However, sufficiently strong dispersion is accompanied by a nonlinear variation of group delay with carrier frequency, which will cause the envelope of the compressed pulse to be distorted and limit the minimum attainable pulse width. Strong dispersion as a limiting influence upon compression of linearly chirped pulses is examined for the grating pair at several laser wavelengths. Specific examples are discussed for the compression of CO2 laser pulses at 10.6-μm wavelength.
58 citations
TL;DR: In this paper, a parametric generator-amplifier system was proposed for the generation of tunable pulses in the infrared with substantial pulse shortening and with high energy conversion of up to 20%.
40 citations
TL;DR: In this article, a fast Pockels cell controlled by an optically driven GaAs electrical switch is used to slice the center of a long optical pulse, yielding a 70psec FWHM pulse with 40psec rise and fall times.
Abstract: Active pulse shaping in the picosecond domain is reported using a fast Pockels cell controlled by an optically driven GaAs electrical switch. The center is sliced out of a long optical pulse, yielding a 70‐psec FWHM pulse with 40‐psec rise and fall times.
39 citations
TL;DR: In this paper, a new optical communication system using the Pulse Interval and Width Modulated Code (PIC) was proposed, which is constructed as combinations of pulse width and interval.
Abstract: This paper proposes a new optical communication system using the Pulse Interval and Width Modulated Code. It is constructed as combinations of pulse width and interval. Then it is easy to understand that the transmission capacity of this Code is bigger than those of Pulse Width Modulation and/or Differencial Pulse Position Modulation.
24 citations
Patent•
21 Feb 1979TL;DR: In this paper, the authors describe the switching of high voltage pulses (of the order of 10 kV) of durations from about 10μs (microseconds) to 10ms (milliseconds) with picosecond accuracy is accomplished by a laser activated semiconductor switch made up of a body (18) of high resistivity semiconductor material, such as nearly intrinsic silicon, integrated into a wide band (10GHz) geometry, which is part of a transmission line.
Abstract: Switching of high voltage pulses (of the order of 10 kV) of durations from about 10μs (microseconds) to 10ms (milliseconds) with picosecond accuracy is accomplished by a laser activated semiconductor switch made up of a body (18) of high resistivity semiconductor material, such as nearly intrinsic silicon, integrated into a wide band (10GHz) geometry, which is part of a transmission line (28). The high bias voltage pulses are obtained by charging the line in synchronism with the generation of the laser pulse. The high voltage bias pulse width can be typically in the range of 10μs- 10ms, and the length of the body (18) is selected so as to prevent thermal breakdown of the semiconductor with such pulse widths. The energy of the laser pulse switches the high voltage to produce a multikilovolt output pulse suitable for driving devices, such as streak cameras or Pockels cells, by the same laser, which need to be synchronized with picosecond accuracy to the laser pulse. The length of the transmission line may be varied to adjust the width of the multikilovolt output pulse.
18 citations
TL;DR: In this article, cross-correlation measurements of the double mode-locked dye laser are described for two different cases, showing that the two pulse trains are highly synchronized and there was zero delay between the two pulses.
Abstract: Cross‐correlation measurements of the cw double mode‐locked dye laser are described for two different cases, showing that the two pulse trains are highly synchronized. A direct display of the pulse shape at the longer wavelength resulted for the first case, in which a short primary pulse was generated along with a much longer incompletely mode‐locked secondary pulse. For the second case, both pulse trains were completely mode‐locked and short. In each case, the jitter between the two pulse trains was less than 1.6 ps and there was zero delay between the two pulses.
17 citations
TL;DR: In this paper, the transmission of a light pulse through a dye solution is determined by its energy density if the pulse duration is short compared to the absorption recovery time, and the energy transmission measurement allows the determination of the pulse energy.
TL;DR: A traveling wave CS(2) Kerr cell has been used to shape optical pulses at 1.06 microm and high contrast jitter-free operation appears to be possible.
Abstract: A traveling wave CS(2) Kerr cell has been used to shape optical pulses at 1.06 microm. The rise time of ~20 psec reported here is possiile because the group velocities for electrical and optical pulses are equal in CS(2) at 1.06 microm. An electrical pulse generated by a light activated semiconductor switch is used to drive the device. High contrast jitter-free operation appears to be possible.
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01 Jan 1979
TL;DR: The extraction and correction of the distorted seismic wavelet yields many interpretive advantages, such as log comparisons, line ties, fine stratigraphic definition, detection of thin layers, and data quality.
Abstract: The extraction and correction of the distorted seismic wavelet yields many interpretive advantages. Well log comparisons, line ties, fine stratigraphic definition, detection of thin layers, and data quality are all improved by successful wavelet processing.
27 Jul 1979
TL;DR: Wang et al. as mentioned in this paper obtained a double pulse from doubly Q-switched ruby laser and made two kinds of double pulse holograms, and showed the utility of double-pulse holography method.
Abstract: Using a pulse laser holography method, it is possible to record moving objects in three dimensions. Furthermore when a double pulse light source is obtained, it is possible to perform the double pulse holography, and various high speed phenomena can be investigated. We could get a double pulse from doubly Q-switched ruby laser and made two kinds of double pulse holograms, and showed the utility of double pulse holography method.
TL;DR: In this paper, the authors measured the cross-sections for collisional excitation transfer with argon and showed that the transfer cross sections are very large, indicating an efficient resonant energy transfer between the SP, level and the 53P,,,,n manifold.
Abstract: inversion is rapidly terminated, resulting in a laser pulse of -50 nsec in duration. The pumping pulse from the dye laser is -2 psec. Emission from the lower-laser level at 4575 A (3ID2 -+ 4’S,) occurs on a time scale too short to accurately measure with the long pumping pulse, but we estimate its lifetime to be on the order of 600 nsec. Collisional transfer efficiently and rapidly populates the 53P,,1,0 levels in the triplet manifold. Very strong stimulated emission is observed from the 33P, level to the 53S1 level. Since the lower-laser level here is not bottlenecked, the 1.9853-pm emission follows the pumping pulse exactly. The time to threshold for this emission is 30 to 50 nsec. The YS1 level, populated by this stimulated emission, also lases at 6162 A, 6122 A, and 6102 A to the metastable 4”PZ,, , , ) levels. The intensities appear approximately in the statistical weights of the lines. This transition is bottlenecked and the laser pulses have a duration of -50 nsec. The 51P1 -+ 53P2,,,n energy transfer occurs with both Ca* + Ca and Ca* + Ar collisions. By monitoring a ratio of fluorescence intensities of emission from lines in both the singlet and triplet manifolds, a determination of the cross sections for collisional transfer can be made. Preliminary measurements on the collisional transfer with argon were made by holding the calcium vapor pressure to -10 millitorr. At this pressure the contribution to the 5’P, -+ 53P,,1,0 transfer by Ca* + Ca is negligible. Upon varying the argon pressure from 0.3 to 15 torr we find that the ratio of triplet to singlet fluorescence intensities increases smoothly by a factor of 3, reaching a plateau. The data fits the expected dependence on argon pressure for a simple equilibrium electronic-toelectronic energy transfer. It is evident that the transfer cross sections are very large, indicating an efficient resonant energy transfer between the SP, level and the 53P,,,,n manifold. More accurate data which will provide specific cross sections for the collisional excitation transfer will be presented at the conference.
TL;DR: In this paper, a technique for generating short duration multiline HF laser pulses using breakdown in high pressure argon is described, and a 7 ns wide pulse with a peak power of 1 MW have been obtained.
Abstract: A technique for generating short duration multiline HF laser pulses using breakdown in high pressure argon is described. 7 ns-wide pulse with a peak power of 1 MW have been obtained.