Temporal and Spatial Coherent Pulse Combining by Multi-path Interferometric Scheme

In this investigation, we propose a compact temporal and spatial coherent pulse combining module to be applied to the divided chirped pulse amplification. Our temporal coherent pulse dividing/combining module has effectively long optical time delay line, which leads to a few ns delay time, because of the multi-path interferometric scheme and the single module can act a role of both dividing and combining pulses. For the coherent pulse combining, the locking of optical coherence by single-detector electronic-frequency tagging technique was adopted and the sub-pulses were successfully combined to achieve the single combined pulse. In order to estimate the power stability, the intensity signals were collected for approximately 13 h and Allan deviation was calculated. As the result, the stability of pulse combining was 2.97 × 10−2 (2.97%) at 1 s integration time.