Enhancement of Thulium-Ytterbium doped fiber laser efficiency using dual-pumping method (original) (raw)
Related papers
IEEE Journal of Quantum Electronics, 2013
A 1901.6-nm laser is demonstrated using the newly developed double-clad ytterbium-thulium-doped fiber (YTDF) samples in conjunction with 931-nm pumping through the transition of thulium ion from 3 F 4 to 3 H 6 with the assistance of ytterbium to thulium-ion energy transfer. The YTDF used was drawn from a D-shape preform, which was fabricated using the modified chemical vapor deposition and solution-doping technique. The laser operates at 1901.6 nm with an efficiency of 2.47% using 2-m-long YTDF in a Fabry-Pérot cavity with two fiber Bragg gratings. It is found that the higher ytterbium-tothulium concentration ratio contributes to more efficient energy transfer between the sensitizer and acceptor ions in YTDF, which in turn lowers the threshold of the proposed ytterbium-thuliumdoped fiber laser (YTFL). The lowest threshold pump power of the proposed YTFL is around 961 mW. The use of multimode pump with a wavelength slightly lower than 931 nm is also observed to improve both the laser's threshold and efficiency of the YTFL.
Laser Physics Letters, 2011
A lasing action from a newly developed double-clad Tm 3+ /Yb 3+ co-doped yttria-alumino-silicate fiber (TYDF) is demonstrated based on cladding pumping technique. The TYDF used was drawn from D-shape preform, which was fabricated using a modified chemical vapor deposition (MCVD) process in conjunction with a solution doping technique. The Tm 3+ and Yb 3+ ions concentrations in this fiber are 5.55×10 19 and 15.52×10 19 ions/cc, respectively. The fiber laser operates at wavelength of 1948.4 and 1947.2 nm with pump power thresholds of 0.6 and 1.0 W for 915 and 940 nm pumping, respectively. The maximum output power of 10.5 mW was achieved with the 915 nm pumping at the maximum pump power of 1.5 W. It is found that the laser is more efficient with 915 nm pumping compared to 940 nm pumping.
2012
A single-mode laser is demonstrated using a newly developed double-clad thulium-ytterbium-doped fiber (TYDF) in a linear cavity formed by two fiber Bragg gratings (FBGs). The YTF used is drawn from a D-shape preform fabricated using the modified chemical vapor deposition and solution doping technique. The laser is operated at 1 901.6 nm via the transition of thulium ions from 3 F4 to 3 H6 with the assistance of ytterbium to thulium ion energy transfer. The efficiencies of the laser are 0.71% and 0.75% at 927and 905-nm multimode pumping, respectively. The thresholds of the launched pump power for 927-and 905-nm pumping are 1 314 and 1 458 mW, respectively. A 7-mW output is obtained at a 905-nm pump power of 2 400 mW. OCIS codes: 140.3510, 060.3510.
Diode-pumped 1 018-nm ytterbium-doped double-clad f iber laser
Chinese Optics Letters, 2011
We report a 1 018-nm ytterbium-doped double-clad fiber laser pumped by 970-nm diode. A pair of fiber Bragg gratings with reflectivities of 99.9% and 9% at a center wavelength of 1 018.9 nm are employed as cavity mirrors. The ytterbium-doped double-clad fiber is a 2.6-m-long Liekki fiber. Laser output power of 7.5 W at 1 018 nm is obtained under the pump power of 59.2 W. The overall slope efficiency of the fiber laser is about 16%. This low slope efficiency is mainly due to the incomplete absorption of the pump power.
Factors reducing the efficiency of ytterbium fibre lasers and amplifiers operating near 0.98 μm
Quantum Electronics, 2017
We have studied the factors that reduce the efficiency of cladding-pumped ytterbium fibre lasers and amplifiers operating in the spectral range around a wavelength of 0.98 mm. It has been shown that the core of the active fibre being not single-mode leads to accelerated development of amplified spontaneous luminescence around l = 1.03 mm, which reduces the highest possible amplifier efficiency. We have examined the effect of spontaneous luminescence propagating in the first reflective cladding. It has been shown theoretically that the pump-to-signal conversion efficiency is highest when the ratio of the core and cladding diameters in a multimode active fibre lies in the range 0.7-1. We have fabricated and characterised an optical fibre with a core-to-cladding diameter ratio of 0.76 (core and cladding diameters of 95 and 125 mm, respectively), which allowed a pump conversion efficiency of 66 % to be reached, a record level for cladding-pumped ytterbium fibre laser systems emitting near 0.98 mm.
Simulation and Computer Modeling of a Diode pumped Erbium-Ytterbium (Er3+/Yb3+) Co-doped Fiber Laser
The International Conference on Mathematics and Engineering Physics
Fiber lasers technology has grown rapidly due to the rapid advances in high power diodes, diode-to-fiber coupling schemes and doped fiber design and fabrication. Erbium-Ytterbium (Er 3+ /Yb 3+) co-doped fiber is an attractive active medium for the fiber lasers in which Ytterbium is co-doped with Erbium to produce a spectrum in third telecoms window around 1550nm which makes them suitable sources for long range applications. In this paper the Er 3+ /Yb 3+ fiber laser pumped by a laser diode at 980 nm is simulated using the Optiwave software. The pump source was swept from 1.25 to 5 w to extract the slope efficiency. The pump radiation was focused into the Er 3+ /Yb 3+ fiber through an input mirror, which was 98% reflecting at 1550 nm and 99% transmitting at 980 nm. A length of 0.1 m of Er 3+ /Yb 3+ fiber was used with an N.A. of 0.22, Er 3+ ion density of 25.4 x 10 24 m-3 , and Yb 3+ ion density of 320 x 10 24 m-3. The output mirror was 50% reflecting at 1550 nm. Then the length of the fiber was swept from 1m to 5m in order to obtain optimized fiber length. The simulation results demonstrated that a laser output power of 0.8 W was obtained at 1550 nm for a launched power of 2 W with a slope efficiency of 40% and a lasing threshold of 0.4 W of launched pump power. The results also showed that the optimized fiber length was achieved at 2 m which is in a good agreement with the published similar experimental schemes.
Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power
Optics Express, 2004
We have demonstrated a highly-efficient cladding-pumped ytterbium-doped fiber laser generating 1.36 kW of continuous-wave output power at 1.1 µ m with 83% slope efficiency and near diffraction-limited beam quality. The laser was end-pumped through both fiber ends and showed no evidence of roll-over even at the highest output power, which was limited only by available pump power.