High precise time division multiplex UV pulse waveform measurement system for high power laser facility

Highlight• A UV frequency modulation pulse waveform measurement scheme based on lens array and fiber bundle is exploited, which immensely improve the coupling efficiency coupling to fiber. Owe to the high coupling efficiency, the scheme can achieve high precise measurement result as well as good economy and anti-interference performance. • A 50μm core diameter and 0.2 numerical aperture multi-mode UV fiber is specially designed and developed. Contribution to the design of OH- and Fluorine jointly adulteration, the fiber can achieve 9.2GHz bandwidth and 32% transmittance after transmitting 60m. • A "four-in-one" measurement system based on the scheme and fiber is manufactured. In the system, four fiber bundles are used for time division multiplex and the experiment indicated that all four waveform measurement result from fiber bundles are identical to the measurement result focusing all over the near-field. • This scheme exploited has greatly improved waveform measurement precise and anti-interference performance on ICF facility, which also has great significance for ICF research. In high power laser facility, the waveform measurement of UV pulse injected to target is very important for power balanced control and experiment result analysis. A time division multiplex UV frequency modulation pulse waveform measurement system based on fiber bundle and lens array is built for a high precise measurement result as well as low construction and maintaining cost. The system can remarkably improve coupling efficiency inject to fiber contribution to the aperture splicing sampling technology and a 50μm multi-mode UV fiber specially developed with 9.2GHz bandwidth@60m transmission. A "four-in-one" time division multiplex measurement system is built for laser facility and the practical experiment indicated that the system can realize precise waveform measurement within good economy and anti-interference performance.