Title :
A model for diffraction-limited high-power multimode fiber amplifiers using seeded stimulated Brillouin scattering phase conjugation
Author :
Moore, Gerald T.
Author_Institution :
Air Force Res. Lab., Kirtland AFB, NM, USA
fDate :
6/1/2001 12:00:00 AM
Abstract :
Diffraction-limited polarized stimulated Brillouin scattering (SBS) Stokes output from a multimode fiber is possible when the Stokes beam is the phase conjugate of diffraction-limited polarized pump light from a narrow-band master oscillator. Net amplification can be obtained by interposing a gain medium, such as a fiber amplifier between the master oscillator and the region of SBS generation. This paper proposes and studies numerically a model which describes the space-time dynamics of SBS generation, including phase conjugation, attenuation, phonon decay, thermal noise, inhomogeneous broadening, and amplifier gain. Noise reduction and phase locking are obtained by seeding the low-power end of the fiber at the Stokes frequency. Simulations are described for the case of 1.064 μm light amplification in a dual-clad Yb-doped multimode fiber amplifier
Keywords :
laser mode locking; laser transitions; optical fibre amplifiers; optical phase conjugation; stimulated Brillouin scattering; ytterbium; 1.064 mum; SBS generation; Stokes beam; Stokes frequency; amplifier gain; diffraction-limited high-power multimode fiber amplifiers; diffraction-limited polarized SBS; diffraction-limited polarized pump light; dual-clad Yb-doped multimode fiber amplifier; inhomogeneous broadening; multimode fiber; narrow-band master oscillator; net amplification; noise reduction; phase conjugate; phase conjugation; phonon decay; seeded stimulated Brillouin scattering phase conjugation; space-time dynamic; thermal noise; Brillouin scattering; Diffraction; Laser excitation; Narrowband; Noise generators; Numerical models; Optical attenuators; Optical fiber polarization; Oscillators; Phonons;
Journal_Title :
Quantum Electronics, IEEE Journal of
