Large-aperture electro-optical switch based on plasma Pockels cell (PPC) is one of important components for inertial confinement fusion (ICF) laser facility. We have demonstrated a single-pulse driven 4×1 PPC with 400mm×400mm aperture for SGIII laser facility. And four 2×1 PPCs modules with 350mm×350mm aperture have been operated in SGII update laser facility. It is different to the PPC of NIF and LMJ for its simple operation to perform Pockels effect. With optimized operation parameters, the PPCs meet the SGII-U laser requirement of four-pass amplification control. Only driven by one high voltage pulser, the simplified PPC system would be provided with less associated diagnostics, and higher reliability. To farther reduce the insert loss of the PPC, research on the large-aperture PPC based on DKDP crystal driven by one pulse is developed. And several single-pulse driven PPCs with 80mm×80mm DKDP crystal have been manufactured and operated in laser facilities.
We demonstrate the design and performance of an optical switch that has been constructed for the SG-II upgrading
facility. The device is a longitudinal, potassium di-hydrogen phosphate (KDP), 360 mm×360 mm aperture, and 2×1 array electro-optical switch driven by a 20 kV output switching-voltage pulse generator through two plasma electrodes produced at the rise edge of the switching-voltage pulse. The results show that the temporal responses and the spatial performance of the optical switch fulfill the operation requirements of the SG-II upgrading facility.
The multi-pass amplified scheme of SGII upgrading laser is similar as that of NIF. Large aperture plasma electrodes Pockels cell (PEPC) is the key unit of this amplified scheme. The transit time that laser beam passes through the PEPC for the first time and second time is about 270ns. PEPC should switch the state between ON and OFF in 270ns. The response time of the PEPC driven by positive-negative switching pulses can not satisfy the demand of SGII upgrading laser due to the higher generator impedance. In the single-pulse-process, the low-impedance high voltage generator based on double Blumlein pulse-forming line is used to drive the PEPC. The amplitude of single pulse is up to 21kV, while the impedance of the generator is only 6.25Ω. The theoretical charge time of the PEPC with 350mm×350mm aperture is about 54ns, and the response time of PEPC is less than 170ns in the single-pulse-process. The response time is reduced greatly. The switching efficiencies with full aperture are higher than 99.7%. The extinction contrast exceeds 381. The top width of the time window is larger than 160ns, and the bottom width is about 400ns. All the experimental results can meet the specification of SGII upgrading laser.
With the methods of time-division multiplexing in Frontend and angle detuning in FOA, each beam pulse on SG-III
prototype facility is controlled independently and so the systematic variations of power imbalance are eliminated
entirely.
Plasma Pockels cell (PPC), which can use a thin crystal to perform the uniform electro-optical effect, is ideal component
as average-power optical switch with large aperture. In this paper, by reformative design and employing a capacity to
share the gas discharge voltage, the DKDP PPC driven by one pulse is realized. As gas breakdown delay time is stable,
and discharge plasma is uniformly filled the full aperture, it meets the demand of plasma electrode for the repetition-rate
PPC with DKDP crystal. A rep-rate plasma Pockels cell (PPC) with Φ30mm aperture has been fabricated. It is optimized
with the limited space of repetition rate diode pumped laser. The specification of the PPC is: static transition of 97.2%,
switching efficiency of 99.8%, the switch rising time of 8.6ns. In the LD pumped Yb:YAG plate laser system, the PPC
can steadily work on 10Hz repetition rate performed as Q-switch. The key problems in PPC are analyzed for
repetition-rate application, and thermo-optical effects are simulated by means of numerical modeling when average
power laser is loaded on the electro-optical crystal. Furthermore, the principium design of rep-rate PPC with
longitudinally conductive cooled structure is described in this paper. It will efficiently abate the thermo-optical effects
under repetition rate application.
Large-aperture plasma Pockels cell is one of important components for inertial confinement fusion laser facility. We
demonstrate a single-pulse driven PPC with 350mm×350mm aperture. It is different to the PPC of NIF and LMJ for its
simple operation to perform Pockels effect. With optimized operation parameters, the PPC meets the optical switching
requirement of SGII update laser facility. Only driven by one high voltage pulser, the simplified PPC system would be
provided with less associated diagnostics, less the maintenance, and higher reliability.
Pockels cell driven by one-pulse process (OPP) is a new technique different from the regular plasma electrode Pockels cell (PEPC). In the OPP regime, only the positive and negative switching pulses will be supplied on opposite sides of the crystal. The OPP Pockels cell developed in our laboratory can work well at high working pressure. In this working pressure range, the gas is steady broken at the start of the switching pulse flattop. When the working gas is evacuated to low pressure, the discharge is unsteady. In an invariable electric field, the gas discharge is determined by the initial free electrons. At low pressure, the low density of initial electrons leads to the instability of gas discharge. The ultraviolet light conduces to increasing the density of the initial free electrons, and reducing the randomness of the initial free electrons. In this experiment, the ultraviolet light is used to irradiate the cathode of the Pockels cell. The experimental results show that, at low pressure, the breakdown of the working gas is steady, and the breakdown delay is shorter with ultraviolet irradiation.
Damage inspection of the large aperture components is required for Large, high-power laser systems. Dark-field
imaging technology is used to enhance resolution of defects. Because there are several of the optics which are laid with
Brewster angle in optics online inspection and the image collected by CCD includes many noises, so the image are quite
complex. A kind of image processing method is introduced, which is based on classical method about edge detection.
Gray restrain is used and the relations between the pixel and its eight neighbours are considered in calculating the
gradient. The defect size is measured and damage defect of optics is analyzed using the image processing methodology.
The new approach produces nice result.
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