Single-shot multi-channel synchronous measurement method and device based on all-fiber spectral interference

Abstract

The invention discloses a single-shot multi-channel synchronous measurement method and device for coherent beam combining in an ultra-short and ultra-intensive laser device, comprising: 1. a reference optical medium reflection mirror; 2. a reference beam condensing lens; Focusing lens; 4. Precision delay stage; 5. Medium mirror to be measured; 6. Beam reduction lens to be measured; 7. Self-focusing lens to be measured; 8. Fiber attenuator; 9.1:n fiber beam splitter; 10. Optical fiber delay line; 11. Optical fiber combiner; 12. Multi-channel optical fiber bundler; 13. Imaging spectrometer; 14. Computer. The spectral interferometry system composed of multiple optical paths of the optical fiber to be measured and the optical path of the reference optical fiber realizes the measurement of the synchronization state of the multiple optical paths of the optical fiber to be measured and the reference optical path before coherent beam combining. The invention makes full use of the advantages of spectral interference as a linear measurement technology, with fast data processing speed and tunable measurement range, as well as the advantages of optical fiber array as an excellent optical waveguide, which is easy to integrate and has good transmission stability, and the whole system has good portability. It solves the problems of system redundancy and low stability in multi-channel measurement, which is beneficial to the single-shot synchronous measurement of multi-channel laser and reference light in coherent beam combining of ultra-short and ultra-intensive laser devices, which is important in high-power coherent beam combining systems. application prospects.

Description

technical field [0001] The invention relates to the technical field of beam-to-beam synchronization measurement in an ultra-short and ultra-intensive laser coherent beam combining system, in particular to a single-shot multi-channel synchronization measurement device based on all-fiber spectral interference, which ensures the single-shot and practicality of multi-channel measurement , robustness. Background technique [0002] In the field of ultra-short and ultra-intensive lasers, in order to continue to improve the laser output capability, the coherent beam combining plan based on multi-channel lasers has become one of the most promising technical routes. The fiber laser beam combining is 10J, 10kHz pulse, which is an important part of the "International Coherent Amplification Network (ICAN)", but it puts forward strict requirements for inter-beam synchronization. [0003] Scientists have made many attempts in the simultaneous measurement control of coherent beam combining...

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Problems solved by technology

[0005] Aiming at the inter-beam synchronization problem of the current ultra-short and ultra-intense laser coherent beam combining system, the present invention proposes an all-fiber single-time multi-channel synchronization measurement method and device based on spectral interference. The all-fiber array is used for multi-channel signals to be measured and The sampling of the reference signal, the regulation and conduction of the spectral interference signal, through the measurement, data processing and analysis of the spectral interference signal of the signal to be measured and the reference signal, the time delay difference between the reference light and the light to be measured is loaded into the precision of the optical path to be measured Delay stage to realize the synchronization of multiple channels of light to be measured and reference light before coherent beam combining

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