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A multiline guided-mode resonance (GMR) filter is applied as a reflector to implement an external cavity laser. We design the resonant element using rigorous numerical methods and fashion an experimental prototype by thin-film deposition, patterning, and etching. A \(\sim 100\) -nm TiO2 grating layer on a \(\sim 170\) -\(\mu \) m-thick glass slab supports thousands of resonant modes. We detect...
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