Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-7-12-4337
Timestamp: 2019-04-22 01:04:37+00:00

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We present low-loss tungstate-tellurite fibers doped with Er3+ for laser operation near 2.7 μm. Two “ultra-dry” preforms with cores of TeO2-WO3-La2O3-Bi2O3 glasses doped with 0.4 and 4 mol% of Er2O3 and undoped TeO2-WO3-La2O3 claddings were produced. High-quality multimode fibers were fabricated and characterized. Photoluminescence spectra of about 2.7 μm (4I11/2 → 4I13/2 transition) and about 1.6 μm (4I13/2 → 4I15/2 transition) were measured under excitation by diode pumping at 975 nm (4I15/2 → 4I11/2 transition). The production test and the theoretical investigation of gain-switched laser generation showed potential applicability of the designed samples in the spectral range of interest. Prospective application of single-mode fibers based on the developed glass preforms was also simulated. A feasibility of pulse train generation was demonstrated even for a rough choice of parameters, which is very encouraging for experimental implementation.
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Fig. 2 Thermograms of differential scanning calorimetry of TWLBE-0.4 and TWLBE-4 glasses.
Fig. 5 Total optical loss of multimode fiber made of Preform-4. Core doped with Er3+/undoped cladding diameters are 50/130 μm.
Fig. 6 (a) Luminescence spectra of TWLBE-0.4 and TWLBE-4 glasses for 4I11/2 → 4I13/2 transition under excitation at 975 nm with 0.5W power. (b) Measured luminescence decay at 0.98 μm after 5-ns pump pulse.
Fig. 7 Photoluminescence spectra of multimode fiber with 50/130 μm core/cladding diameters made of Preform-4 under excitation at 975 nm: for pump power of 88 mW for different gain fiber lengths (a); for different pump powers for fiber length of 10 cm (b).
Fig. 8 Simplified scheme of Er energy levels (a). Variant of experimental laser scheme (b). Pump pulses at the input end (blue) and generated output pulses (black) (c). Temporal evolution of output signal power in periodic regime (d). Averaged population defined by Eq. (10) for different time scales (e, f). RL = 0.85, αs = 2 dB/m, Ppump = 10 W.
Fig. 9 Laser signal energy as a function of reflection coefficient at the multimode fiber output for different pump peak powers Ppump and fiber losses.
Fig. 10 Laser signal energy at 2.7 µm as a function of reflection coefficient at single-mode fiber output for different pump peak powers Ppump and fiber loss.
Fig. 11 (Upper row) Temporal evolution of output signal power for different reflection coefficients. Green curves correspond to the time profile of the leading edge of the pump (right axes). (Lower row) Temporal evolution of output signal energy. Each subplot is calculated for the indicated thereon pump peak power and fiber loss of 2 dB/m.
Fig. 12 Energy of the first spike (a), spike duration (b), and optimal pump pulse duration for generating only one spike (c) as functions of reflection coefficients for different pump peak powers Ppump. The inset demonstrates typical temporal structure of pump and signal pulses. Fiber loss is 2 dB/m for (a), (b), (c). Energy of the first spike (d), its duration (e), and optimal pump pulse duration for generating only one spike (f) as functions of fiber loss (for RL = 0.1). t1 = 100 ns for all subplots.
(9) P out (t)= P s + (L,t)− P s − (L,t).
(10) n ¯ 2,3 (t)= 1 L ∫ 0 L n 2,3 (z,t)dz .

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