Comparison between Analytical Solution and Experimental Setup of a Short Long Ytterbium Doped Fiber Laser

Abstract

In this research, Amplified Spontaneous Emission (ASE) spectrum characteristics for a highly Yb 3+ 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 Yb 3+ 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.

Wide wavelength selectable all-fiber thulium doped fiber laser between 1925 nm and 2200 nm

“…Besides, absorption lines caused by water vapor in the wavelength range from ~1800 nm to ~1950 nm could be clearly seen in the spectrum. Compared to the backward ASE, the forward ASE had a similar long wavelength edge of ~2200 nm but exhibited a narrower spectrum range spanning from ~1945 nm to ~2220 nm with a FWHM of ~35 nm at the launched pump power of 8 W as a result of its stronger re-absorption at un-pumping end [40,41]. The red-shifted of long wavelength edge in our work can be ascribed to the comparatively long active fiber (~11 m) and large rare earth ions concentration (~5 wt.…”

Gain Saturation in Optical Fiber Laser Amplifiers

“…Figure 2. Typical absorption and emission spectra of Yb 3+ ions in germanosilicate host [21] In addition, the emission spectrum peak (D) corresponds to the energy transfer from level U 0 to the levels L 1 , L 2 , and L 3, while that at (E) belongs to the transition from level U 1 , generating weak emissions around 900 nm. The broad absorption spectrum of Yb 3+ ions enables the easy configuration of the pump wavelength.…”

Properties of Yb doped silica fibers with different Al and P co-dopants concentrations produced by the Sol-Gel based granulated silica method

“…Over the last few years, rare earth (RE) doped silica glass fibers have attracted increasing interest for the development of fiber amplifiers and fiber lasers [1]- [5]. Ytterbium doped silica fibers are of particular interest due to their numerous advantages, such as simple energy level diagram with only two electronic multiplets (2F5/2 and 2F7/2), long fluorescence lifetime, broad absorption and emission bands and high quantum efficiency [6]- [8]. All these features make ytterbium doped silica fibers exceedingly implemented in optical amplifiers and fiber lasers, and especially in high power laser systems for applications requiring bright and high power beam, such as material processing, medicine and telecommunication [9]- [11] Most rare-earth-doped silica glass fiber preforms are well known to be fabricated using the traditional modified chemical vapor deposition (MCVD) method because of its excellent degree of achievable purity and low optical loss [12], [13].…”