Abstract
In this research, Amplified Spontaneous Emission (ASE) spectrum characteristics for a highly Yb3+ doped glass fiber with different pump powers and pump wavelengths are scrutinized. ASE spectral profile and wavelength shift corresponding to different optical fiber lengths are measured. Highly-doped Yb3+ fiber lasers in a linear-cavity are both experimentally and analytically investigated. Rate equations are solved using quasi-numerical models. Numerical results are reported for wide range of operating conditions to enable design optimization. The model takes into account the scattering loss and the distributed laser loss power density in strongly pump condition. The effects of various parameters such as pump power, pump wavelength, signal wavelength and fiber length on the output power and laser threshold are studied. Theoretical results are shown to be in good agreement with the experimental data.
Highlights
Fiber lasers have many advantages such as high conversion efficiency, immunity from thermal lensing effect, simplicity of optical construction and excellent beam quality
Amplified Spontaneous Emission (ASE) spectral profile and wavelength shift corresponding to different optical fiber lengths are measured
For a given fiber length, the experimental results show that the ASE bandwidth can be further increased as the pumping wavelength decreases
Summary
Fiber lasers have many advantages such as high conversion efficiency, immunity from thermal lensing effect, simplicity of optical construction and excellent beam quality. Much work on Ytterbium Doped Fiber lasers (YDFLs) focuses on increasing the efficiency of the Laser and some authors have studied Fiber lasers theoretically. The output powers from doped fiber lasers and amplifiers have been scaled and one approach for further power scaling these light sources is to increase the concentration to reduce the required fiber length and avoid nonlinear effects. Pumping doped silica fiber with high concentrations can result in excess loss at the pump and signal wavelengths owing to photodarkening, which can significantly reduce the overall conversion efficiency and degrade the long-term performance [6]. Rate equations are solved using semi-numerical models [7,8] This model takes into account the scattering loss and the distributed laser loss power density in strongly pump condition [9]. The effects of various parameters such as pump power, pump wavelength, signal wavelength and fiber length on the output power and laser threshold are studied
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call