We demonstrate a highly-Yb-doped fiber with pedestal and triple-cladding stretching fiber for utilizing in chirped pulses amplification systems with high ratio of stretching/compression and low level of stimulated Raman scattering. The stretching triple-cladding fiber consisting of high-index Ge-doped core, low-index F-doped depression concentric layer and high-index Ge-doped concentric layer. By varying the fiber structure parameters (refractive indexes and geometrical size) we were able to tailor its dispersion parameter and its slope values in order to match these with a grating-pair compressor ones to obtain better pulse compression quality (shortest possible duration and pedestal-free structure). Realized fiber has dispersion parameter of -140 ps/nm/km at 1026 nm and slope of 12 um^-1. The highly-Yb-doped fiber for the final amplification stage of the CPA has aluminophosphorosilicate glass core with a germanium-doped pedestal around it; core/pedestal diameters were 14/50 um, outer cladding has square shape with edge size of 130 um. Despite of high Yb ions content (cladding absorption of 40 dB/m at 976 nm) the core NA was only 0.09 due to the creation of the pedestal. We utilized a 23 cm piece of the fiber to amplify 22ps chirped pulses with 1.432 MHz repetition rate up to 10.2W of average power, when the first stokes of Raman starts to evolve, corresponding to 320 kW of peak power. The pump-to-signal conversion efficiency was 64%. M2 factor was 1.15/1.12. Experiments on amplification of the 500 ps chirped pulses and its compression will be presented at the conference.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.