+21 dBm erbium power amplifier pumped by a diode-pumped Nd:YAG laser (original) (raw)
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Operation of erbium-doped fiber amplifiers and lasers pumped with frequency-doubled Nd:YAG lasers
Journal of Lightwave Technology, 1989
An optical amplifier consisting of an erbium-doped germanosilicate fiber optically pumped at 532 nm is described. Negligible excited-state absorption at 532 nm allows efficient pumping, enabling a gain of 34 dB at 1536 nm to be obtained for only 25 mW of pump power. The pulsed pump source produces negligible noise on the small signal if the pump repetition rate is above 10 kHz. Pulsed laser operation is achieved by pumplng a Fabry-Perot erbiuni doped fiber laser with a frequency doubled Q-switched Nd-YAG laser. Pulses of 0.9-W peak power and 280-11s duration at 1.538pm were obtained. Manuscript received March 1, 1989; revised April 24, 1989, This work was supported by SERC through a Research Fellowship to M C. Farries, by JOERS through a Studcntship to T. A. Birks. by Pirelli General plc through a Readership to D. N. Payne and a Fellowship to R I Laming. and by British Aerospace through a Fellowship io P. R. Morkel. M. C. Farries was wirh the Optical Fiber Group Depanmeni of Electronics and Computer Science,
IEEE Photonics Technology Letters, 2005
With a view to improve the power level and brightness of semiconductor pump lasers, we have resorted to a scalable implementation and achieved spectral beam combining through a low-quality-factor external cavity. For that purpose, a high-power single-mode laser array emitting up to 2.1 W at 3.2 A at 980 nm has been realized, which delivers 1.5 W in external cavity. A power of 0.66 W was finally coupled into the single-mode fiber, with a coupling efficiency of 44%. Pumping experiments of an erbium-doped fiber amplifier utilizing this laser have demonstrated efficiency and noise characteristics similar to what is usually obtained with conventional sources, with the noteworthy advantage of a lower gain excursion over the-band.
Fiber-Laser-Pumped Er:YAG Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2009
Hybrid fiber-laser-pumped solid-state lasers exploit high-power cladding-pumped fiber lasers for direct (in-band) pumping of a crystal-based solid-state laser to reduce heating in the laser crystal, and hence allow scaling to higher power in both continuous-wave (CW) and pulsed modes of operation. In this paper, we briefly review the attractions of the hybrid laser approach for generation of output in the ∼1.6 µm wavelength regime and consider the main design considerations for efficient operation of hybrid lasers based on Er:YAG in both CW and pulsed modes of operation. Examples of hybrid Er:YAG lasers, pumped by Er,Yb codoped fiber lasers at 1532 nm, with CW output powers up to 60 W at 1645 nm and 31 W at 1617 nm and slope efficiencies of 80% and 47% with respect to incident pump power, respectively, are described. In Q-switched mode of operation, pulse energies up to 30.5 mJ were obtained, limited by coating damage. Finally, the prospects for further increase in output power and improvement in overall performance in CW and Q-switched modes of operation will be discussed.
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.
Erbium-doped fiber power amplifiers with pump reflecting mirrors in the 800 nm band
IEEE Photonics Technology Letters, 1992
The behavior of alumino-phosphate-silicate (APS) erbium-doped fiber power amplifiers (EDFA) for the various pump wavelengths, in the small signal and large signal regime, has been well studied with the 800 nm band pumping. It has already been shown that bidirectional pumping is more efficient especially at shorter wavelengths due to the presence of large excited state absorption (ESA). However, bidirectional pumping requires more components which can increase the complexity and cost of the system. In this letter, we have compared, using a computer model, the performance of power EDFA's with a Bragg reflecting pump mirror etched at the output end of the fiber. For small pump powers (P p = 10 mW) this configuration is better than bidirectional pumping, both for gain and noise figure (NF). At large pump powers (P, = 200 mW) the output signal powers are comparable and the noise figure is better for the configuration with the reflecting mirror.
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.
High-power operation of aluminum-free (κ=0.98 μm) pump laser for erbium-doped fiber amplifier
IEEE Photonics Technology Letters, 1993
We report on the fabrication and characteristics of high-power ( Pcw = 430 mW) InGaAs/InGaAsP/InGaP ridge waveguide lasers emitting at A = 0.98 p m which is the optimum wavelength for pumping erbium-doped fiber amplifiers. So far, high power operation of AI-free pump lasers has been limited to 150 mW mainly due to catastrophic optical damage of the mirror facet. This problem has been largely removed by increasing the spot size of the laser with the aid of an improved waveguide design. As a result, AI-free lasers can now achieve a maximum power comparable to the conventional G a m s based pump lasers for A = 0.98 pm.
Compact multimode pumped erbium-doped phosphate fiber amplifiers
Optical Engineering, 2003
The performance of compact multimode pumped erbiumdoped phosphate fiber amplifiers is presented. A fiber amplifier with a small signal net gain of 41 dB at 1535 nm and 21 dB over the full C-band is demonstrated using a newly developed 8-cm-long erbium-doped phosphate fiber excited with a 1-W, 975-nm multimode laser diode. A theoretical model is developed for the multimode pumped amplifier based on modified rate equations and an effective beam propagation method. Close agreement between experimental and modeling results is observed.
High energy in-band pumped erbium doped pulse fibre laser
We demonstrate an inband, core-pumped master oscillator power amplifier (MOPA) with a maximum pulse energy of 1.56 mJ at a repetition rate of 1.25 kHz, seeded by an actively Q-switched Erbium/Ytterbium-codoped fiber (EYDF) ring laser, producing 150-ns pulses at 1562.5 nm. To maximize energy extraction whilst minimizing signal saturation effects, a 40µm Er 3+ -doped larger mode area (LMA) fiber was used as the gain medium. A 1535 nm single mode fiber laser was used for in-band pumping of the LMA fiber. The output beam quality (M 2 ) was measured to be ~1.6. This is to the best of our knowledge is the highest reported pulse energy for a pulse fiber laser at 1.5 µm with M 2~1 .6.