FEL2012 - List of Authors (Dyunin, E.)

Paper

Title

Page

First Observation of Optical Current Noise Suppression Below the Shot-Noise Limit

357

A. Gover, E. Dyunin
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv, Israel
A. Nause
University of Tel Aviv, Tel Aviv, Israel

Funding: We acknowledge support of the Israel Sciience Foundation grant
We report first demonstration of optical frequency current shot-noise suppression in a relativistic e-beam. The effect was demonstrated by measuring sub-linear growth of OTR Radiation as a function of current. This finding indicates that the beam charge homogenizes, and its distribution becomes sub-Poissonian. The effect is made possible by collective Coulomb interaction between the electrons of a cold intense beam during beam drift, and is essentially a process of longitudinal beam-plasma oscillation[1]. Suppression of beam current noise below the classical "shot-noise" level has been known in the microwave tubes art[2]. This is the first time that it is demonstrated in the optical regime. We predict that the scheme can be extended to the XUV and possibly to shorter wavelengths with further development of technology. The fundamental current shot-noise determines the level of incoherent spontaneous radiation emission from e-beam radiators and SASE-FELs. Suppressing shot-noise would make it possible to attain spontaneous emission sub-radiance[3] and surpass the shot-noise coherence limits of seed-injected FELs, approaching fundamental (Schawlow-Towenes[4]) coherence limits of lasers.
[1] A. Gover, E. Dyunin, PRL, 102, 154801, 2009
[2] H. Haus, N. Robinson, Proc. IRE, 43, 981 (1955)
[3] A. Dicke, Phys. Rev. 93, 99 (1954)
[4] A.L.Schawlow and C.H.Townes, Phys. Rev., 112, 1940

Slides WEOB04 [5.837 MB]

Paper	Title	Page
WEOB04	First Observation of Optical Current Noise Suppression Below the Shot-Noise Limit	357
	A. Gover, E. Dyunin University of Tel-Aviv, Faculty of Engineering, Tel-Aviv, Israel A. Nause University of Tel Aviv, Tel Aviv, Israel
	Funding: We acknowledge support of the Israel Sciience Foundation grant We report first demonstration of optical frequency current shot-noise suppression in a relativistic e-beam. The effect was demonstrated by measuring sub-linear growth of OTR Radiation as a function of current. This finding indicates that the beam charge homogenizes, and its distribution becomes sub-Poissonian. The effect is made possible by collective Coulomb interaction between the electrons of a cold intense beam during beam drift, and is essentially a process of longitudinal beam-plasma oscillation[1]. Suppression of beam current noise below the classical "shot-noise" level has been known in the microwave tubes art[2]. This is the first time that it is demonstrated in the optical regime. We predict that the scheme can be extended to the XUV and possibly to shorter wavelengths with further development of technology. The fundamental current shot-noise determines the level of incoherent spontaneous radiation emission from e-beam radiators and SASE-FELs. Suppressing shot-noise would make it possible to attain spontaneous emission sub-radiance[3] and surpass the shot-noise coherence limits of seed-injected FELs, approaching fundamental (Schawlow-Towenes[4]) coherence limits of lasers. [1] A. Gover, E. Dyunin, PRL, 102, 154801, 2009 [2] H. Haus, N. Robinson, Proc. IRE, 43, 981 (1955) [3] A. Dicke, Phys. Rev. 93, 99 (1954) [4] A.L.Schawlow and C.H.Townes, Phys. Rev., 112, 1940
	Slides WEOB04 [5.837 MB]