Single trench fiber (STF) is one kind of promising novel fibers. In this paper, we design and fabricate a piece of ytterbium-doped STF. The core diameter of the homemade STF is 30 μm and the cladding diameter is 250 μm. Based on this self-developed STF, we have constructed an all-fiberized fiber amplifier that is operating under a continuous-wave regime at 1070 nm wavelength. The maximum output power of the system reaches 1.5 kW, which, to the best of our knowledge, is the highest output power of STF-based laser systems. The M2 is measured to be 1.65 at 1.36 kW and 1.92 at the highest output power respectively. The slope efficiency of amplification system is 68%. The performance of the system can be further enhanced by optimizing the fiber design and system structure.
All-solid photonic bandgap fiber (AS-PBGF) has been an unrivalled platform for the effective mode area (EMA) scaling of large-mode-area fiber and the selective spectral filtering. Super-large EMA scheme assisted by the multiple resonance mechanism is also achievable while maintaining the robust single-mode (RSM) operation. In the current work, we have proposed aother modified multi-resonant AS-PBGF with some high-index nodes are replaced by the background material. By extending the multi-resonant coupling concept, a specially designed microstructural cladding, with multiresonant cores in the inner layers and leakage channels in the outermost layer, is employed to generate broadband resonance and modal dissipation of high-order-modes (HOMs) under bent configuration. Sufficient confinements on the modal distribution of fundamental mode (FM) are retained by adjusting the arrangement of Ge-doped rods in the microstructure cladding precisely, and the rotational symmetry of the proposed AS-PBGF makes it insensitive to bending direction. The missing Ge-doped rods in each layer are properly designed to stress differential bending loss between FM and HOMs with high loss ratio. Bending loss of FM less than 0.05 dB/m and high loss ratio over 200 times are always available and independent of bending direction. An EMA greater than 900 μm2 and a loss ratio up to ~ 495 can be obtained under the bending radius of 45 cm.
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.