AI Article Synopsis
- The study compares cladding patterns in grating structures created using an ultrafast laser and a phase mask against a continuous wave (cw) beam interference model.
- For picosecond pulses, the observed patterns align well with model predictions, but femtosecond pulses require consideration of full bandwidth and pulsed characteristics due to group-velocity walk-off effects.
- An intriguing finding is that group-velocity walk-off allows for pure two-beam interference generation with a phase mask when using femtosecond pulses.
Article Abstract
We compare the cladding patterns present in grating structures fabricated with an ultrafast laser and a phase mask with a cw beam interference model. We find that the observed patterns agree well with the model results for picosecond pulses; however, for femtosecond pulses, we show that the full bandwidth and the pulsed nature of the sources must be considered because the pattern can be affected by group-velocity walk-off. An interesting consequence of order walk-off is the possibility of pure two-beam interference generation with a phase mask in the femtosecond pulse regime.
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| http://dx.doi.org/10.1364/ol.29.001458 | DOI Listing |
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