The beam combination method using stimulated Brillouin scattering phase conjugate mirrors is a promising technique
for solid state lasers of high power/energy operating with high repetition rate. The key technology of this method is the
phase control of the SBS waves. In the previous works, the principle of this phase control technique was demonstrated experimentally. As a next step, in this work, amplifiers have been added to the beam combination system. Inserting the amplifiers, a stabilized phase difference has been obtained with a fluctuation less than λ/50 at 44 mJ total output energy and 10 Hz repetition rate.
The beam combination technique using stimulated Brillouin scattering (SBS) phase conjugate mirrors (PCMs)
proposed by one of the authors, H. J. Kong, is a promising one for realization of high energy/power laser system with
high repetition rate. However, phase controlling of the SBS waves is essentially required for beam combination system,
since the SBS-PCM generates the random phase. Recently, we have achieved successful results for phase locking by the
self-generated density modulation method. But it showed a long-term phase fluctuation due to the long-term fluctuation
of the density of the liquid SBS medium. To compensate this long-term phase fluctuation, we have designed new phase
stabilization system. In this paper, we will introduce this system and show successful experimental results.
The beam combination technique using stimulated Brillouin scattering phase conjugate mirrors (SBS-PCMs) is one of
the most promising technology to realize high energy/ high power/ high repetition rate. The beam combination technique
using SBS-PCM can compensate any optical distortions occurred in the amplifier chain because it gives the phase
conjugated wave for the good beam quality. In this paper we will introduce the cross type amplifier as a basic unit of the
proposed beam combination system and show essential technology for realization of the beam combination system, such
as the new SBS phase control technique proposed by the authors. These new techniques are the most simple among the
phase locking techniques developed previously, and furthermore it is possible not only to lock but also to control the
phases of the SBS waves very accurately.
By numerical simulations, it has been shown that a conventional cylindrical rod can be used as a hollow conic beam generator by illuminating a parallel laser beam inclined to the axis of the rod. Half of the conic beam is formed by the reflection at the surface of the cylindrical rod, and the opposite side of the conic beam by its transmission. We discuss the parameters to determine the size of the conic beam and the effect of the dielectric multilayer coating on the intensity distribution of the conic beam. The line beams of the shapes such as circle, ellipse, parabola, or hyperbola can be generated by this hollow conic beam generator, depending on the position and orientation of the observing plane.
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