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Showing papers on "Femtosecond pulse shaping published in 1974"


Journal ArticleDOI
TL;DR: In this article, a model of a passively mode-locked quasi-continuous laser is discussed and the evolution of pulses in various cavity configurations is traced and the combined action of amplifier and absorber saturation is shown to lead to rapid pulse compression even when the pulse duration is far shorter than the relaxation time.
Abstract: Various models of a passively mode-locked quasi-continuous laser are discussed and the evolution of pulses in various cavity configurations is traced. In certain circumstances, the combined action of amplifier and absorber saturation is shown to lead to rapid pulse compression even when the pulse duration is far shorter than the relaxation time of either nonlinear component. The results are in good agreement with recent streak- camera measurements involving the pulsed Rhodamine 6G dye laser and satisfactorily explain the efficient generation of picosecond pulses in CW dye-laser systems. The same pulse-compression mechanism can probably be used to generate ultrashort pulses in other quasi-continuous lasers.

266 citations


Journal ArticleDOI
01 Mar 1974
TL;DR: In this article, a review of the diagnostic techniques currently available for the generation of intense ultrashort light pulses in mode-locked laser systems is presented, with a discussion of ultrafast shutter techniques, together with a section on pulse chirping and dynamic spectroscopy.
Abstract: The generation of intense ultrashort light pulses in mode-locked laser systems has made possible a wide range of new experiments designed to study the interaction of light with matter. For the quantitative interpretation of the results, accurate measurement of the optical pulse structure is essential, and it is the purpose of this paper to review all the diagnostic techniques currently available. The recent rapid development of the electron-optical streak camera is highlighted, while considerable space is devoted to an extensive description of the many second- and higher order correlation measurements (including the popular two-photon fluorescence method). A discussion of ultrafast shutter techniques is also included, together with a section on pulse chirping and dynamic spectroscopy.

218 citations


Journal ArticleDOI
TL;DR: In this article, the authors obtained simple analytic solutions for ultrashort pulse generation in a degenerate mode-locked optical parametric oscillator pumped synchronously by a modelocked laser.
Abstract: We obtain simple analytic solutions for ultrashort pulse generation in a degenerate mode‐locked optical parametric oscillator pumped synchronously by a mode‐locked laser. Very short pulses (∼1 psec) are predicted at steady state very close to threshold where pump depletion is negligible; but the parametric pulses broaden to the same order as the pumping laser pulses as soon as pump pulse depletion becomes significant. In the transient buildup regime, where pump depletion is again negligible, pulse widths approximately a quarter of the pump pulse width are obtained.

71 citations


Journal ArticleDOI
TL;DR: In this article, the authors proposed a pulse compression scheme which reduces the peak intensity while increasing the energy density achievable in a Nd:glass amplifier chain by injecting a lower intensity and longer duration pulse into the chain.
Abstract: We propose a pulse compression scheme which reduces the peak intensity while increasing the energy density achievable in a Nd:glass amplifier chain. Self‐focusing is the dominant effect responsible for limiting the power of a short‐pulse Nd:glass amplifier chain, and the reduction of the intensity (through this compression scheme) greatly reduces these problems. We recommend injecting a lower‐intensity and longer‐duration pulse into the chain. Under some circumstances, the glass nonlinearity will impress upon the pulse a chirp suitable for efficient subsequent temporal compression, and this may result in higher effective peak power operation. If a 1‐nsec (full 1/e duration) temporally Gaussian pulse with a chain‐averaged peak intensity of 2 GW/cm2 propagates 2 m in a Nd:glass laser chain, we calculate that the pulse could be subsequently compressed (by a series of Gires‐Tournois interferometers) to 125 psec with good stability against input pulse amplitude noise. Such short pulses are of major interest for laser fusion.

31 citations


Journal ArticleDOI
01 Jul 1974
TL;DR: In this article, experimental results on both the processes involved in the establishment of ultrashort light pulses during their build-up from noise and in their subsequent growth and narrowing are presented.
Abstract: This paper describes and reviews experimental results on both the processes involved in the establishment of ultrashort light pulses during their build-up from noise and in their subsequent growth and narrowing. Schemes for the improvement of the USP train are suggested.

28 citations


Journal ArticleDOI
TL;DR: In this paper, an inexpensive GaAs diode pulse generator is presented, capable of producing optical impulses as narrow as 110 psec at a wavelength of 0.9 μ and a pulse repetition rate of 50 kHz.
Abstract: An inexpensive GaAs laser diode pulse generator is presented. This generator has found application in the evaluation of optical pulse dispersion in glass fiber optical waveguide studies. It is capable of producing optical impulses as narrow as 110 psec at a wavelength of 0.9 μ and a pulse repetition rate of 50 kHz. With a slight modification, it may be used to produce optical pulses of considerably longer duration at reduced repetition rates.

25 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the time evolution of a mode-locked pulse produced by a CO2 laser passively mode locked with an In-doped Ge bleachable absorber.
Abstract: The results of an investigation of the time evolution of a mode‐locked pulse produced by a CO2 laser passively mode locked with an In‐doped Ge bleachable absorber are presented. The observed pulse shortening is explained by a simple theory of pulse compression due to the saturable absorber. Pulse durations as short as 400 ps are observed.

23 citations


Journal ArticleDOI
TL;DR: In this paper, a hybrid integration of an injection laser with a simple avalanche transistor modulator is shown to produce optical peak powers of several tens of watts magnitude and pulse rise times appreciably shorter than 1 ns.
Abstract: The hybrid integration of an injection laser with a simple avalanche transistor modulator is shown to produce optical peak powers of several tens of watts magnitude and pulse rise times appreciably shorter than 1 ns. In certain circumstances the pulse leading edge assumes the form of a spike having a displayed rise time of 120 ps.

22 citations


Journal ArticleDOI
TL;DR: In this paper, the authors made an analysis of the mechanism of formation of a substructure in ultrashort pulses emitted by a mode-locked neodymium laser, due to a nonlinear correction to the refractive index of the active medium subjected to the high-power optical field of a pulse.
Abstract: An analysis was made of the mechanism of formation of a substructure in ultrashort pulses emitted by a mode-locked neodymium laser. The substructure was due to a nonlinear correction to the refractive index of the active medium subjected to the high-power optical field of a pulse. A numerical calculation relating to this process was made and the results obtained were compared with the experimental data.

19 citations


Journal ArticleDOI
TL;DR: In this article, three experimental realizations of a technique for generating intense laser pulses with continuously variable and precisely controllable durations in the subnanosecond and nanosecond range are described.
Abstract: Three experimental realizations of a technique for generating intense laser pulses with continuously variable and precisely controllable durations in the subnanosecond and nanosecond range are described. Laser pulses with durations ranging from 0.5 to 2.0 ns at power levels up to 0.3 MW have been generated. Applications of the technique to optical pulse shaping, cavity dumping of mode-locked pulses, and optical isolation of amplifiers are discussed.

15 citations


Patent
16 Oct 1974
TL;DR: In this paper, a laser system for producing short optical pulses with higher energy and controllable shape from a high power solid state laser system is described, which includes two gratings at the output with an adjustable interferometer between the laser source and an amplifier element.
Abstract: A laser system for producing short optical pulses with higher energy and controllable shape from a high power solid state laser system. The system includes two gratings at the output with an adjustable interferometer between the laser source and an amplifier element. Thus, the output pulse may be tailored to a particular shape.

Patent
18 Nov 1974
TL;DR: A carrier-injected avalanche device series connected to a forwardly-poled injection laser generates a current pulse, which may be as short as one nanosecond, through the injection laser only when both a direct current bias voltage is applied across this series connection from a charge supply and carriers have been injected into the device in response to the leading edge of a modulation trigger pulse as mentioned in this paper.
Abstract: A carrier-injected avalanche device series connected to a forwardly-poled injection laser generates a current pulse, which may be as short as one nanosecond, through the injection laser only when both a direct current bias voltage is applied across this series connection from a charge supply and carriers have been injected into the device in response to the leading edge of a modulation trigger pulse. This current pulse through the injection laser is of sufficient magnitude to effect pumping thereof, so that the injection laser emits a corresponding pulse of coherent light, which may also be as short as one nanosecond.

Patent
13 May 1974
Abstract: A pulse shape detector apparatus to process the distorted pulse output of logarithmic amplifiers in heterodyne receivers and to synthesize a replica of the input pulse to the amplifier.

Journal ArticleDOI
TL;DR: In this paper, a parallel plate channel electron multiplier for single pulses was constructed and the pulse properties such as rise time and duration were investigated for this multiplier, which was then used to construct a single pulse multiplier.

Journal ArticleDOI
TL;DR: In this paper, the spectra of ultrashort pulses, selected from different parts of a pulse train, and of the spatial distribution of the spectral components in a cross section of a single-mode laser beam were investigated.
Abstract: An investigation was made of the spectra of ultrashort pulses, selected from different parts of a pulse train, and of the spatial distribution of the spectral components in a cross section of a single-mode laser beam. The spectra were found to be asymmetric with a predominance of the short-wavelength wing.

Journal ArticleDOI
TL;DR: In this paper, a double-discharge TEA CO 2 mode-locked oscillator/ amplifier system was described, which produces a maximum energy output of approximately 10 J in a single nanosecond pulse.
Abstract: A double-discharge TEA CO 2 mode-locked oscillator/ amplifier system, which produces a maximum energy output of approximately 10 J in a single nanosecond pulse, is described. The mode-locked oscillator operates on at least four lines simultaneously. The characteristics of the amplifying medium are also discussed.



Journal ArticleDOI
Ivan V. Tomov1
TL;DR: In this paper, the use of nonlinear optical phenomena at the boundary of a nonlinear medium for measuring the duration and the pulse shape of ultrashort light pulses is considered.

Journal ArticleDOI
TL;DR: A theoretical discussion of the characteristic features of the generation of electromagnetic radiation and measurement of the parameters of ultrashort laser pulses in the case when these are used to excite resonators containing electrooptic crystals is given in this article.
Abstract: A theoretical discussion is given of the characteristic features of the generation of electromagnetic radiation and of the measurement of the parameters of ultrashort laser pulses in the case when these are used to excite resonators containing electrooptic crystals.