One of the current challenges towards the development of ultrafast 2 microns all-fiber laser systems delivering transform-limited pulses is to manage dispersion and nonlinearities which are well-known limiting factors in fiber-based systems due to their negative impact on pulse duration and shape.
Here, we present what we believe to be, to the best of our knowledge, the first all-solid step-index dispersion tailored fiber designed with anomalous dispersion around 2 microns. This all-solid, step-index ultra-high numerical aperture (UHNA) fiber offers an efficient and simple alternative compared to existing approaches such as free-space optical systems or micro-structured fibers that are complex to manufacture and handle. The combination of highly Ge-doped core with a small core diameter allows tailoring the material and waveguide components of the dispersion to reach the anomalous dispersion required by the application.
In this work, details will be provided using experimental and calculated values via the example of a non-PM UHNA fiber with 2.45 microns core and 0.34 NA. This fiber was designed to achieve anomalous dispersion of -45 ps/(nm.km) at 2 microns. It will be shown that the UHNA fiber design can be further tuned to achieve specific values of anomalous dispersion and dispersion slope. The fiber performances were confirmed using a 2 microns chirp-pulsed fiber amplifier where the pulse duration was measured at 24 ps and 4.3 ps without and with the UHNA fiber respectively. A PM-UHNA fiber design is currently being developed and will be characterized and tested following a similar fashion.
Clémence Jollivet, Daniel Jeannotte, Peyman Ahmadi, Adrian L. Carter, and Kanishka Tankala, "Dispersion tailored non-PM and PM fibers for 2 microns ultrafast fiber lasers (Conference Presentation)," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830E (Presented at SPIE LASE: January 30, 2017; Published: 21 April 2017); https://doi.org/10.1117/12.2250543.5383482344001.
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