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공홍진,Dong Won Lee,Jin Woo Yoon,Masahiro Nakatsuka,Seong Ku Lee 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
For practical laser fusion energy (IFE) generation, a M-J laser driver is required with a repetition rate of over 10 Hz. Achieving an IFE driver with this high repetition rate requires reduction of the thermal load of the laser system. Several methods have been developed for this goal, such as beam combination, the gas-cooled, diode-pumped laser, the electron beam pumped gas laser, and the large-sized ceramic Nd:YAG. The beam-combination technique using stimulated Brillouin scattering phase conjugate mirrors (SBS-PCM) is a promising one among these techniques for the IFE driver. The beam-combination laser system does not need a large-gain medium, so it can be operated at a repetition rate exceeding 10 Hz, regardless of the output energy. Moreover, it is easily adaptable to the modern laser technology. We propose a beam-combination laser with SBS-PCMs whose energy can be freely scaled up by increasing the number of separate amplifiers, and also demonstrate the practical and efficient phase control of SBS waves which is essential in a beamcombination laser using SBS-PCMs. In this paper, recent theoretical and experimental results on phase control and a beam-combination laser for developing the IFE driver are discussed in detail.p
공홍진,신재성,Du Hyun Beak,Sangwoo Park 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
Laser facilities in the world have been developing flash-lamp-pumped ultrahigh-energy solid-state lasers for fusion research and high-repetition diode-pumped solid-state lasers to act as commercial fusion drivers. A commercial laser fusion driver requires a high-energy beam with a total energy of several megajoules per pulse in several nanoseconds with a ~10-Hz repetition rate. However,current laser technologies have limitations in raising the beam energy when operating with a high repetition rate, which is necessary for a commercial fusion driver to function properly. The beam combination laser system, which that uses stimulated Brillouin scattering phase conjugate mirrors,is a promising candidate for a fusion driver because it can obtain both a high energy and a high repetition rate with separate amplifications. For the realization of the beam combination laser system, a self-phase control technique was proposed for the coherent beam combined output, and its principle was demonstrated experimentally.
공홍진,양동열,이광섭,Shin Wook Yi 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
A three-dimensional microstructure with several tens of nanometer resolution can be fabricated using the ultrafast laser-induced two-photon photopolymerizing fabrication technique. In this fabri- cating technique, SCR-500 (urethane acrylate) and SU-8 (epoxy) are used as two-photon absorbing photopolymerizable resins. SCR-500 has been used widely to fabricate a 3-D microstructure with highly precise details, but its high-aspect-ratio structure is naturally excessively. On the other hand, SU-8 is rigid, so a high-aspect-ratio microstructure can be fabricated with SU-8. In this report, various aspect-ratio microstructures with SCR-500 and SU-8 were fabricated and the viability of the structures was investigated. Also a 70 nm-linewidth nanowire, which connects between two high-aspect-ratio structures, was fabricated.
Four-beam Coherent Combination by Using Stimulated Brillouin Scattering with Wavefront Division
공홍진,신재성,박상우 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.21
Using stimulated Brillouin scattering phase conjugate mirrors (SBS-PCMs), we conducted a coherent beam combination of wavefront-divided beams. “Self-phase-controlled” SBS-PCMs were used to lock and control the phases of the SBS wave. Using an interferometer, we monitored the relative phase differences of the four spatially divided beams in real time. With long-term phase stabilization, the phase differences between the reference beam and the other three beams were well stabilized at standard deviations of λ/36.3, λ/35.8, and λ/43.4 for a duration of 2500 shots (250 s).