Investigation On The SBS Phase Conjugation Mirror Character Of High Energy Laser Pump

As the development of Inertial Confinement Fusion (ICF), the laser output with high energy and high light beam quality is needed. People focus attention on optics phase conjugation technique for it can control light beam and correct wave-front aberrance. Thereinto, Stimulated Brillouin Scattering (SBS) has the characters of high conversion efficiency,phase conjugation,pulse compression. It can compensate wave front aberrance, improve light beam quality and power intensity, effectively reduce laser system scale and cost. Thus it has very important significance in ICF research.However, because of limits of other non-liner effect, SBS laser system's energy output can not satisfy the request of applying on ICF laser drivers. Thus, this paper develops the research of SBS phase conjugation characters adapting to large caliber high energy lasers.The main contents and conclusion are as follows:1. SBS character research based on high energy laser and high load phase conjugaton mirror (PCM) is proposed. And the plus character and energy current distributing is simulated.2. The high energy laser system gains hundred J output without SBS phase conjugation mirror, the stability is within 5%.3. The experiment research of the ratio of seed pump and amplifier pump's influence on energy reflectivity,far field phase fidelity,pulse compression ratio is performed.4. The high energy laser system gains 13J output with 7J input on SBS phase conjugation mirror, energy reflectivity achieves about 65% when pump energy is higher than SBS threshold hundreds times, and phase conjugation fidelity reaches above 80%. The independent two-cell SBS phase-conjugation mirror has much higher load capability and is higher efficient.5. Compared with general single cell the experiments of the influence of pump energy on energy reflectivity,phase conjugation fidelity and their stabilities have been performed on this system. The curve changing laws are achieved. And experiments also get better near field fidelity at the same time...