Quartz Microfluidic Chip Fabrication Using Femtosecond Pulse Clusters

The invention segments the laser processing into multiple pulse clusters, where each pulse cluster contains multiple femtosecond laser pulses. This segmentation allows the laser to process quartz glass in controlled stages, creating complex three-dimensional micro-channel structures through cumulative ablation effects while maintaining high productivity through automated scanning and parallel processing capabilities.

The invention employs periodic action by using pulse clusters with specific repetition frequencies and time intervals. The femtosecond laser operates in a periodic manner where pulses are grouped into clusters with repetition frequencies between 1 Hz and 100 kHz, and time intervals between 0.1 ms and 100 ms within each cluster. This periodic pulsing enables controlled material removal and heat accumulation effects, facilitating complex three-dimensional structure formation while maintaining processing efficiency for large-scale production.

The periodic pulsing within pulse clusters creates a controlled thermal accumulation effect where subsequent pulses in each cluster build upon the previous pulse's ablation. This periodic action with specific time intervals (0.1 ms to 100 ms) allows heat to accumulate and propagate, significantly increasing the ablation rate while the controlled nature of the pulsing maintains surface flatness through consistent material removal patterns.

The pulse cluster technique ensures continuity of useful action by maintaining a high density of pulses within each cluster. The continuous succession of femtosecond pulses within the cluster timeframe creates sustained ablation action, preventing interruptions that would compromise surface quality. This continuous energy delivery to the quartz glass surface enhances both ablation rate and surface flatness by eliminating idle periods between processing stages.