Low-cost microlens array for long-period grating fabrication

Low-cost microlens array for long-period grating fabrication

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A low-cost technique using commercial UV-grade fibres to construct a microlens array that is suitable for the mass-production of long-period gratings is reported. The array can withstand in excess of 1 J/cm2 per 20 ns pulses of 248 nm laser light. The growth rate of long-period gratings fabricated using the array is four times faster than that possible using a metal mask.


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      • Tam, H.Y.: Patent pending.

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