Gain and Dispersion Focusing in a High Gain Laser

Abstract

The transverse modes of a laser resonator containing a medium with a strong radial gain profile differ greatly from the modes of a similar resonator containing a low gain medium. Focusing and defocusing effects result from the gain profile and from the associated dispersion profile. The dispersion focusing causes an asymmetry in the power output as the laser is tuned across the gain line. The theory has been verified using a high gain 3.51-u xenon laser.

Routes to Chaotic Output from a Single-Mode, dc-Excited Laser

“…The slight asymmetry about the Lamb dip is due primarily to dispersion focusing effects. 13 Figure 2 shows samples of the power spectrum of the laser intensity for particular parameters. The locations of the spectral peaks are plotted in Fig.…”

Gain-guided leaky-waveguide laser amplifiers: analytical methods and recent progress on experiments

“…The occurrence of gain-guiding with index-defocusing was also demonstrated in the xenon laser when detuned from the laser line center [2]. Recently there has been a renewed interest in the use of solid-state waveguide lasers employing leaky or index antiguiding fields to yield single transverse mode with large mode area, especially those employing solid rather than gaseous laser media [3,4].…”

Double-resonance spectroscopy by a transversely nonuniform pump beam in a three-level molecular system

“…(1) and taking into account that H "=hen 6 "d"E(t,r) (m-, n =1,2, 3) (where 5 " is the Kronecker's 6, d " is the matrix element of the dipole moment operator for the transition between levels m and n and d""=0),we obtain the following set of equations for the amplitudes 2, B, and C of the off-diagonal density-matrix elements and for the population differences p, 3 and p 32 defined as p, 3 =p» -p33,…”

“…(1) Here we consider the steady-state solution of Eqs. (3) by making the population differences p» and p32 as well as the amplitudes 3, 8, and C time independent, i.e. , setting the time derivatives in (3) equal to zero.…”