980-nm diode-pumped power-scalable continuous wave mid-IR (2.7 μm) fiber laser (original) (raw)

Diode-pumped mid-infrared fiber laser with 50% slope efficiency

Optica, 2017

Until now, the field of mid-infrared fiber laser research has been constrained by the limitation imposed by the Stokes efficiency limit. The conversion of high-power diode light emission operating at near-infrared wavelengths into mid-infrared light invariably results in the deposition of significant amounts of heat in the fiber. This issue is compounded by the fact that mid-infrared transmitting glasses are thermomechani-cally weak, which means scaling the output power has been a longstanding challenge. In this report, we show that by cascading the adjacent transitions of the erbium ion at 2.8 and 1.6 μm in combination with a low-loss fluoride fiber, the slope efficiency for emission at 2.8 μm can reach 50%, thus exceeding the Stokes limit by 15%. We also show that by highly resonating the 1.6 μm transition, a highly non-resonant excited-state absorption process efficiently recycles the excitation back to the upper laser level of the mid-infrared transition. This demonstration represents a significant advancement for the field that paves the way for future demonstrations that will exceed the 100 W power level.

Power requirements for erbium-doped fiber amplifiers pumped in the 800, 980, and 1480 nm bands

IEEE Photonics Technology Letters, 2000

We examine the relative merits of exciting Er3+ amplifiers at the three wavelengths for which high-power laser diodes are available at 800, 980, and 1480 nm. Model calculations are confirmed by a detailed experimental comparison of the power requirements for pumping in the 800-nm band and at 980 nm. To obtain comparable performance with respect to gain and noise figure, 7-8 dB more power is required when pumping in the 800-nm-band.

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.

Characterization of a high-power erbium-doped fiber laser

In this paper we investigate the properties of a 10 W double-clad Er:Yb doped fiber amplifier in two laser setups. It is first studied an all-fibered continuous laser. A laser efficiency of 20 % is obtained with an output power of about 8 W for 40 W pumping power. A passively mode-locked fiber laser is then built up. In the anomalous dispersion regime it is obtained a soliton crystal involving some hundreds of solitons. We demonstrate that the soliton crystal becomes unstable for higher pumping power resulting in its dislocation.

Erbium–ytterbium fibre laser emitting more than 13 W of power in 1.55 μm region

Pramana, 2014

We report the work on erbium:ytterbium doped double clad fiber laser (EYDFL), that is pumped at 976nm. The maximum output power generated is 13.6 Watts in 1550nm region with a slope efficiency of about 21%. To the best of our knowledge, this is the highest power reported from an EYDFL, that uses commercially available off-the-shelf large mode area Er:Yb doped double-clad fiber.

Erbium:Ytterbium Codoped Large-Core Fiber Laser With 297-W Continuous-Wave Output Power

IEEE Journal of Selected Topics in Quantum Electronics, 2007

We have demonstrated a high-power and high-efficiency erbium:ytterbium (Er:Yb) codoped fiber laser that produces 297 W of continuous-wave output at 1567 nm. The slope efficiency with respect to the launched pump power changed from 40% to 19% at higher output power due to the onset of Yb colasing at 1067 nm. However, the Yb colasing was essential for the suppression of catastrophic pulsation at high pump powers that otherwise results if the Yb-band gain is allowed to build up. Spectroscopic characteristics of the fiber and the impact of the Yb colasing on the 1567-nm slope efficiency are also discussed.

Dual-wavelength erbium-doped fluoride fiber laser

Lasers in Medical Science, 2019

The laser source with 3 μm/2 μm output wavelength has many application prospects in clinical medicine, photoelectric countermeasure, and scientific research measurement. An Er 3+ doped ZBLAN fiber laser with output wavelength of 2 .8 μm and 1 .6 μm is experimentally studied. By setting the pump power to 5 W, a continuous dual-wavelength output with a central wavelength of 2.803 μm and 1.61 μm is obtained and the corresponding maximum output power is 362.4 mW and 108.6 mW. The slope efficiency is 12.1% and 4.94% respectively. What's more, the slope efficiency is 12.1% and 4.94% respectively, and the fluctuation rates of peak power of the two wavelengths are 9.7% and 2.1% within 4 h which indicate that the laser has relatively good stability.