Fig. 1. Schematic diagram of the 60-channel optical spectrometer. Sixty reflective collectors are set on the inner side of the chamber wall, as shown in (a), collecting the lights emitted from the laser–target interactions. The angles of the laser beams are in the format of (, ), where the polar angle is indicated as and the azimuthal angle as . The polarization angle from -polarization of Beams #1 and #7 is 23° clockwise, and that of Beams #3 and #5 is 7.5° anti-clockwise. The collectors reflect the lights to a fiber bundle, which is extended for 20 m outside the chamber to a spectrometer, as shown in (b), and the spectra are recorded by a CCD camera.

Fig. 2. Mosaic image of the UV and white LED spectra recorded by the spectrometer with the 150-G/mm grating. Here the white LED light was recorded with an OD4 filter and 1000-s exposure. The UV one was recorded with 1-s exposure and the intensity was artificially reduced by a factor of 10 for better visibility.

Fig. 3. (a) Schematic diagram of the conical irradiation. The spherical CHCl shell is initially embedded in the gold cone, and four laser beams overlap at the shell surface through 700-μm continuous phase plates. (b) Laser temporal profile on the target. (c) The coordinates of the collectors in the 2D angular map, with Beams #1, #3 and #7 incident angles.

Fig. 4. (a) Raw image for the multi-channel spectra of the scattered lights from the laser-driven shell-in-cone target implosion. Here the longitudinal axis represents collectors at different orientations, and the wavelength in spectra indicates different processes of LPIs (the spectral response needs to be taken into account for absolute energy calculation). The corresponding angular distributions of the 351-nm lights, SRS and /2 re-scattering TPD are shown in (b), (c) and (d), using linear interpolation for the directions in between two adjacent collectors. The incident angles for the laser beams are shown in the angular distribution maps.

Table 1. List of the spectral ranges and resolution with a 200-μm slit using different ruled gratings.