High Power Laser Science and Engineering, Volume. 4, Issue 2, 02000e16(2016)
Design of deformable mirrors for high power lasers
Figures & Tables(7)
Fig. 1. (a) Slab of active media, (b) heat deposition distribution and thermal effects numerical model results in the form of resulting temperature and OPD distributions.
Fig. 2. (a) Example of actuators position in a square DM. SA defines the size of the side actuators; AR is the size of the active region (part of the DM illuminated by the laser beam). (b) Reports the Strehl Ratio obtained with the correction of the DM realized in different configurations as reported in the legend in function of the DM stroke.
Fig. 3. Stroke in function of glass diameter (with fixed aspect ratio of 25) and PZT thickness with voltage held constant to 150 V.
Fig. 4. Pictures of the characterized DMs. (a) Dipole
Fig. 5. Results of characterization of three DMs in terms of Legendre modes generation capability. The results are compared with the estimated Legendre decomposition of the wavefront of 10 J multi-slab amplifier, which was calculated by the Miró model.
Fig. 6. (a) Cross-section of the spot obtained with by the application of the wavefront calculated with the thermo-optical simulations and after the correction with the closed loop. (b) Spot image of the aberrated wavefront. (c) Spot after the correction with the closed loop operation.
Table 1. Parameters of the characterized DMs.
View tableView in ArticleTable 1. Parameters of the characterized DMs.
Hilase DiPOLE Hilase $7\times 7$ Femto1 $\text{CO}_{2}$ Femto45 Mirror size ( $\text{mm}^{2}$ $40\times 40$ $30\times 30$ $40\times 40$ $36\times 36$ 40 mm 10 cm Estimated beam size ( $\text{mm}^{2}$ $27\times 27$ $20\times 20$ $26\times 26$ $24\times 24$ 30 mm 5 cm Actuator array disposition $6\times 6$ $6\times 6$ $7\times 7$ $6\times 6$ 144 circular 36 oval ( $45^{\circ }$ Laser DPSSL DPSSL DPSSL Ti:Sa $\text{CO}_{2}$ Ti:Sa Reflectivity bandwidth (nm) 960–1120 960–1120 960–1120 710–880 — 780–820 Reflectivity ${>}$ ${>}$ ${>}$ ${>}$ — ${>}$ Dispersion — — — $\text{GDD}<20~\text{fs}^{2}$ — $\text{GDD}<20~\text{fs}^{2}$ Coating Dielectric Dielectric Dielectric Dielectric Gold Dielectric Damage threshold ( $\text{J}/\text{cm}^{2}$ ${>}20$ ${>}20$ ${>}20$ ${>}5$ — ${>}5$ SA/RA 0.24 0.25 0.26 0.25 0.16 0.21
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Stefano Bonora, Jan Pilar, Antonio Lucianetti, Tomas Mocek. Design of deformable mirrors for high power lasers[J]. High Power Laser Science and Engineering, 2016, 4(2): 02000e16
Paper Information
Special Issue: HIGH ENERGY CLASS-DIODE PUMPED SOLID STATE LASER TECHNOLOGY
Received: Dec. 30, 2015
Accepted: Mar. 1, 2016
Published Online: Nov. 1, 2016
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