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Timestamp: 2019-04-24 04:59:20+00:00

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Fig. 1 The schematic diagram of the multi-pass amplifier bench. P1, P2: polarizer; HWP: half-wave plate; FR1, FR2, FR3: Faraday rotator; M1, M2, M3: flat reflecting mirror; QWP: quarter-wave plate; PC, Pockels cell; L1, L2, L3, L4, L5, L6: lens; VT1, VT2: vacuum tube; AMP: amplification rod; DM: deformable mirror; BS: beam splitter; AF: attenuating filters; SH-WFS: Shack–Hartmann wavefront sensor.
Fig. 2 The thermal aberrations of the square rod medium, (a) the overall thermal aberration, (b) the defocus part, (c) the residual part without defocus.
Fig. 3 The pinhole-passing efficiencies with different passing numbers of the multi-pass amplifier.
Fig. 4 The relay-imaged planes in the multi-pass amplifier.
Fig. 5 The thermal lens of different equivalent numbers in the gain medium (a) and the remove distances of the relay-imaged Plane 5 positions (b).
Fig. 6 The remove distances of relay-imaged plane positions with different passing numbers in the ten-passing amplification process.
Fig. 7 The near-field intensity of ten-pass amplification output beam in the wavefront measurement plane.
Fig. 8 The near-field images in the wavefront measurement plane after double-pass [Fig. 8(a)], four-pass [Fig. 8(b)] and six-pass [Fig. 8(c)] amplifications.
Fig. 9 The wavefront of double-pass amplification before (a) and after (b) AO compensation.
Fig. 10 The static (a) and dynamic (b) aberration parts under double-pass amplification.
Fig. 11 The wavefront of four-pass amplification after double-pass (a) and four-pass (b) AO compensation.
Fig. 12 The wavefront of six-pass, eight-pass, ten-pass amplification and the whole channel before (a, c, e, g) and after (b, d, f, h) AO stepwise compensation.
Fig. 13 The near-field images [Fig. 13(a)-(e)] in the wavefront measurement plane and the output far-field image [Fig. 13(f)] after the double-pass [Fig. 13(a)], four-pass [Fig. 13(b)], six-pass [Fig. 13(c)], eight-pass [Fig. 13(d)] and ten-pass [Fig. 13(e), Fig. 13(f)] amplifications using the process-oriented AO compensation method.

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