Abstract
In order to meet the ignition pulse power requirements for fast ignition, fast ignition drivers being constructed and planned mainly adopt similar technology of segmented primary mirrors as the astronomical telescopes, realizing large-aperture multi-channel laser coherent focusing. Using the geometrical optics tracing and Fourier method to solve the model of tiling focusing, the effect of tiling scale of parabolic mirrors and control precision on focal-spot peak power is studied by theory and numerical simulation. Under certain control precision, the Strehl ratio of far-field focal spot is simulated on 2 × 2, 3 × 3 and 4 × 4 tiling scales of off-axis parabolic mirrors, and the effect of precision error on focal-spot Strehl ratio is statistically analyzed by Monte-Carlo method of normal distribution. The results show that the probability of strehl ratio larger than 0.8 is over 60%, when the errors of outside-plane rotation angles and piston motion are respectively 1 μrad and 210.6 nm the 2 × 2 structure.
| Original language | English |
|---|---|
| Pages (from-to) | 2625-2628 |
| Number of pages | 4 |
| Journal | Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams |
| Volume | 22 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2010 |
| Externally published | Yes |
Keywords
- Control precision
- Fast ignition pulse
- Monte-Carlo tolerance analysis
- Peak power
- Tiling parabolic mirrors
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