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One of the biggest challenges in modem Astronomy is the direct detection of extrasolar planets using ground based telescopes. While the small angular separation of the star-planet system is an unchangeable limitation, the contrast ratio can dramatically be improved by shifting the observing wavelength to the mid-infrared. In the astronomical L'-band (3.5–4.1 μm), atmospherical disturbances are relatively...
One of the main challenges of astronomy these days is to directly image exoplanets and protoplanetary disks using diffraction limited optics. Due to the proximity of the planet to the host star and its small size, the discovery of new planets requires high angular resolution and high contrast imaging. Achieving these two requirements is challenging with existing astronomical instrument. However, the...
The waveguide lasers fabricated in Yb-doped phosphate and silicate using femtosecond laser direct-write technique were compared. The output power and threshold was similar. However, the differential mechanism of refractive index change can influence their performance over time.
Utilizing a recently developed novel two-step fabrication process we present the first experimental demonstration of photonic band-gap waveguiding structures inscribed into bulk optical glass via the femtosecond laser direct-write technique. The waveguides are fabricated by placing an array of circular high-index contrast rods around an unmodified core. We observe the formation of discrete band-gaps...
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