Title :
Narrow Linewidth DFB Waveguide Laser Fabricated via Ultrafast Laser Inscription
Author :
Yuwen Duan ; Dekker, Peter ; Jaatinen, Esa ; Foster, Scott ; Ams, Martin ; Steel, Michael J. ; Withford, Michael J.
Author_Institution :
Dept. of Phys. & Astron., Macquarie Univ., Sydney, NSW, Australia
Abstract :
Linewidth measurement of a femtosecond laser direct-written distributed feedback (DFB) waveguide laser (WGL) is reported. The WGL was fabricated in Yb-doped phosphate glass using the femtosecond laser direct-write technique. The linewidth was measured using a loss-compensated recirculating delayed self-heterodyne interferometer. By recirculating the output signal in a 10.2-km fiber delay loop, the linewidth was measured to be 35.4±1.4 kHz at a delay time of 306 μs0 , which is comparable with that of narrow-linewidth fiber DFB lasers.
Keywords :
distributed feedback lasers; fibre lasers; high-speed optical techniques; laser beams; laser materials processing; laser variables measurement; light interferometry; optical glass; phosphate glasses; spectral line breadth; ytterbium; P2O5:Yb; WGL; Yb-doped phosphate glass; delay time; femtosecond laser direct-write technique; femtosecond laser direct-written distributed feedback waveguide laser; fiber delay loop; linewidth measurement; loss-compensated recirculating delayed self-heterodyne interferometer; narrow linewidth DFB waveguide laser; narrow-linewidth fiber DFB laser; output signal; size 10.2 km; time 30 mus; ultrafast laser inscription; Delays; Distributed feedback devices; Laser noise; Measurement by laser beam; Optical waveguides; Ultrafast optics; Waveguide lasers; Fabrication and characterization; Lasers; waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2359467
