Raman pulse compression of excimer lasers for application to laser fusion

Murray, James E.; Goldhar, J.; Eimerl, D.; Szöke, A.

doi:10.1109/jqe.1979.1070009

Cited by 204 publications

(30 citation statements)

References 65 publications

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“…An early review of pulse compression of excimer lasers in gases is given by Ref. 6. The advantages of using plasma were recognized by Capjack et al 7 Raman compression in gas mixtures, from tens of nanoseconds to tens of picoseconds, has been achieved at about 25% efficiency for energies in the range of 0.1 to 10 J.…”

Section: Introductionmentioning

confidence: 99%

Generation of ultrahigh intensity laser pulses

Fisch

Malkin

2003

Physics of Plasmas

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Mainly due to the method of chirped pulse amplification, laser intensities have grown remarkably during recent years. However, the attaining of very much higher powers is limited by the material properties of gratings. These limitations might be overcome through the use of plasma, which is an ideal medium for processing very high power and very high total energy. A plasma can be irradiated by a long pump laser pulse, carrying significant energy, which is then quickly depleted in the plasma by a short counterpropagating pulse. This counterpropagating wave effect has already been employed in Raman amplifiers using gases or plasmas at low laser power. Of particular interest here are the new effects which enter in high power regimes. These new effects can be employed so that one high-energy optical system can be used like a flashlamp in what amounts to pumping the plasma, and a second low-power optical system can be used to extract quickly the energy from the plasma and focus it precisely. The combined system can be very compact. Thus, focused intensities more than 10 25 W/cm 2 can be contemplated using existing optical elements. These intensities are several orders of magnitude higher than what is currently available through chirped pump amplifiers.

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Section: Introductionmentioning

confidence: 99%

Generation of ultrahigh intensity laser pulses

Fisch

Malkin

2003

Physics of Plasmas

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“…A higher decay rate compared to the prediction from the Landau damping theory is predicted for high-Z dense plasmas where the electron density ranges from 10 21 to 10 24 cm −3 and the electron temperature is moderately higher than the Fermi energy. The ion acoustic wave, a longitudinal collective mode in plasmas, plays a crucial role in a range of applications, such as the Thomson scattering [1,2] and the Brillouin scattering [3]. Understanding the dynamics of the wave in dense plasmas or warm dense matter is important in various context, including the inertial confinement fusion [4,5] and the compression of x-rays [6][7][8][9].…”

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confidence: 99%

Enhanced damping of ion acoustic waves in dense plasmas

Son¹,

Moon²

2011

Physics of Plasmas

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A theory for the ion acoustic wave damping in dense plasmas and warm dense matter, accounting for the Umklapp process, is presented. A higher decay rate compared to the prediction from the Landau damping theory is predicted for high-Z dense plasmas where the electron density ranges from 10 21 to 10 24 cm −3 and the electron temperature is moderately higher than the Fermi energy. The ion acoustic wave, a longitudinal collective mode in plasmas, plays a crucial role in a range of applications, such as the Thomson scattering [1,2] and the Brillouin scattering [3]. Understanding the dynamics of the wave in dense plasmas or warm dense matter is important in various context, including the inertial confinement fusion [4,5] and the compression of x-rays [6][7][8][9].The decay rate of the ion acoustic waves in plasmas is often modeled by the prevalent Landau damping theory. However, this theory is inadequate for dense plasmas, as the Umklapp process, which is not accounted for, becomes pronounced in high densities. It was shown that the Umklapp process dominates the Landau damping for low-k plasmons [10][11][12]. Even though the detailed underlying physical mechanisms of the plasmons are different from those of the ion acoustic waves, it is expected that the Umklapp process is also important to the ion acoustic waves. The goal of this paper is to estimate the effect of this process. Starting from the plasmon damping theory in dense plasmas [11], a new theory predicting the ion acoustic wave sampling is proposed and a regime where the decay rate is larger than the prediction by the Landau damping theory is identified. This result would have implications on the Brillouin scattering of dense plasmas, the x-ray Thomson scattering, and the reflection problem in the inertial confinement fusion.First we provide a brief review on the Landau damping theory for the ion-acoustic wave. Only a neutral plasma of single ion-species ions is considered for simplicity. We denote the electron (ion) temperature by T e (T i ), the corresponding density by n e (n i ), the mass by m e (m i ), and the charge by Z e = 1 (Z i = Z), where the charge neutrality condition reads n e = Zn i . The longitudinal dielectric function is ǫ(k, ω) = 1 + χ e + χ i , whereω 2 i,e = 4πn i,e Z i,e e 2 /m i,e is the ion (electron) plasmon † Current Address: 28 Benjamin Rush Ln. Princeton, NJ 08540 * Electronic address: seunghyeonson@gmail.com frequency, and f i,e is normalized as f i,e = 1d 3 v. We assume v ti < ω/k ≪ v te , where v ti,te = T i,e /m i,e . This is a necessary condition for a moderate Landau damping. Under this assumption, χ e and χ i can be estimated to be χ e ∼ = 1/(kλ de ) 2 and χ i ∼ = −(ω i /ω) 2 , where λ de = T e /4πn e e 2 is the Debye screening length. The condition ǫ = 0 yields the dispersion relation for the ion acoustic wave,where V = ZT e /m i . The ion acoustic wave decay rate from the Landau damping theory is given to bewhereand S = ω iaw /kv te,ti . According to the Landau damping theory for the ion acoustic wave, there are many elec...

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“…There are many techniques interested and used to compress the optical pulse as the amplitude passive modulation, the mode-locking, the intra-cavity saturation absorption-amplification [1,2], the stimulated Raman backscattering in plasma [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], etc. The operating principle of all mentioned techniques is based on the nonlinearity in the optical medium under the interaction of the intense laser beam [2,3,8,12,23].…”

Section: Introductionmentioning

confidence: 99%

Two Models of Optical Pulse Self-Compressor Combined the Nonlinear Coupler with Backward Raman Fiber Amplifier

Ho¹,

Chu²

2012

JEMAA

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Based on the nonlinearity of the nonlinear optical coupler (NOC) and the amplifying capacity of the backward Raman fiber amplifier (PBRFA), two new optical systems to compress the optical pulse (Optical Pulse Self-Compressor: OPSC) are proposed. Using the expressions describing relationship between input and output intensities from ports of the NOC and the derived expression describing the amplification of the PBRFA, the compressing process of the optical pulse propagating through the OPSC is simulated. The results show that the peak of the optical pulse will be enhanced and the duration of the optical pulse will be reduced significantly. Consequently, the shape of input pulse is completely compressed with the certain efficiency. It means the optical pulse is self-compressed without the external pump pulse by proposing the OPSC.

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Raman pulse compression of excimer lasers for application to laser fusion

Cited by 204 publications

References 65 publications

Generation of ultrahigh intensity laser pulses

Generation of ultrahigh intensity laser pulses

Enhanced damping of ion acoustic waves in dense plasmas

Two Models of Optical Pulse Self-Compressor Combined the Nonlinear Coupler with Backward Raman Fiber Amplifier

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