Steady-state pulses and superradiance in short-wavelength, swept-gain amplifiers

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Phys. Rev., A, v. 12, no. 6, pp. 2568-2573

DOI:https://doi.org/10.1103/PhysRevA.12.2568· OSTI ID:4021960

Bonifacio, R; Hopf, F A; Meystre, P; Scully, M O

The steady-state behavior of amplifiers in which the excitation is swept at the speed of light is discussed in the semiclassical approximation. In the present work the case where the decay time of the population is comparable to that of the polarization is examined. Pulse propagation is shown to obey a generalized sine-Gordon equation which contains the effects of atomic relaxations. The analytical expression of the steady-state pulses (SSP) gives two threshold conditions. In the region of limited gain the SSP is a broad pulse with small area which can be obtained by small signal theory. In the second region of high gain the SSP is the superradiant $pi$ pulse. Its pulse power is not limited as in usual superradiant theory because, as is shown, for a swept excitation the cooperation-length limit does not exist. (auth)

• Research Organization: Univ. of Arizona, Tucson
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-025813
• OSTI ID: 4021960
• Journal Information: Phys. Rev., A, v. 12, no. 6, pp. 2568-2573, Journal Name: Phys. Rev., A, v. 12, no. 6, pp. 2568-2573; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*LASERS-- AMPLIFIERS
420300* --Engineering--Lasers
N42210* --Engineering--Facilities & Equipment--Lasers
PULSES
STEADY-STATE CONDITIONS
X RADIATION