Saturation and Refraction in Amplified Spontaneous Emission X-Ray Lasers

2002 ◽  
Author(s):  
G. J. Pert
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
X Ray

scholarly journals The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed

2009 ◽  
Vol 27 (3) ◽  
pp. 393-398 ◽  
Author(s):  
H. Huang ◽  
G.J. Tallents
Keyword(s):  
Spontaneous Emission ◽  
Extreme Ultraviolet ◽  
Amplified Spontaneous Emission ◽  
Gain Saturation ◽  
Free Electron Lasers ◽  
Laser Amplifier ◽  
One Dimensional ◽  
X Ray ◽  
Laser Amplifiers ◽  
Harmonic Radiation

AbstractThe minimum irradiance needed to overcome amplified spontaneous emission (ASE) of a seed beam injected into a laser amplifier is evaluated. The treatment is particularly applicable to extreme ultraviolet (EUV) and X-ray laser schemes to inject laser harmonic radiation as a seed into (1) plasma laser amplifiers and (2) free-electron lasers. Simple expressions and calculations are given for the minimum injected irradiance required for amplification of the injected seed beam to exceed ASE from the amplifier, including the effects of gain saturation, assuming one dimensional radiative transfer.

scholarly journals A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

10.14311/1787 ◽  
2013 ◽  
Vol 53 (2) ◽  
Author(s):  
Jakub Hübner ◽  
Pavel Vrba
Keyword(s):  
Physical Model ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Coherent Radiation ◽  
Capillary Discharge ◽  
Mhd Equations ◽  
One Dimensional ◽  
X Ray ◽  
Model Based ◽  
Set Up

Feasible soft-X-ray amplification in the CVI and NVII Balmer transition is investigated in a capillary discharge. The best conditions and parameters for the experimental set-up are found for an ablative capillary. The most optimistic results have shown that the gain would be greater than one, which is the condition for successful ASE (Amplified spontaneous emission) in capillary discharges. The capillary discharge evolution is modeled using the NPINCH program, employing a one-dimensional physical model based on MHD equations. The information about the capillary discharge evolution is processed in the FLY, FLYPAPER, FLYSPEC programs, enabling the population to be modeled on specific levels during capillary discharge.

scholarly journals Two-frequency undulator usage in compact self-amplified spontaneous emission free electron laser in Roentgen range

2017 ◽  
Vol 35 (2) ◽  
pp. 326-336 ◽  
Author(s):  
K. Zhukovsky ◽  
I. Potapov
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Harmonic ◽  
Amplified Spontaneous Emission ◽  
Energy Spread ◽  
X Ray ◽  
Sase Fel ◽  
Generation Of Harmonics ◽  
Harmonic Power

AbstractThe generation of harmonics in two-frequency undulator in a self-amplified spontaneous emission free electron laser (SASE FEL) is studied in order to produce Roentgen radiation in a relatively compact sized installation. The dynamics of SASE FEL is analyzed with the help of the phenomenological model to obtain the maximum of the X-ray high-harmonic power. The model accounts for the properties of the undulator magnetic field and of the electron beam and includes the major sources of losses, such as the electron energy spread, etc. It is compared and calibrated with the existing data on a FEL experiment. The advantages of the two-frequency undulator for Roentgen SASE FEL are demonstrated and the possibility to generate powerful mild Roentgen radiation at already ~25 m length is shown. The evolution of the bunching coefficients for high harmonics is studied together with the evolution of the FEL-induced energy spread. The linear and non-linear regimes are explored for common and for two-frequency undulators The usage of the two-frequency undulator for cascade SASE FEL with high X-ray harmonic power and high-harmonic bunching coefficients with low-induced energy spread is proposed.

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