Watt-level visible laser in double-clad Pr³⁺-doped fluoride fiber pumped by a GaN diode

Abstract

We report on a red Praseodymium fiber laser delivering 1.07 W at 634.5 nm with a slope efficiency of 20.7% (vs. the incident pump), a laser threshold of 0.55 W and a single-mode output (M 2 x,y <1.1) in the quasi-continuouswave regime. It is based on a 0.6 mol% Pr 3+ -doped ZBLAN double-clad fiber with a 5.5 μm core, a double D-shaped (diameters: 115/125 μm) inner cladding and a length of 5.0 m. The fiber is pumped by a multimode 443-nm GaN diode. The laser design is optimized using a numerical model. The proposed concept is suitable for the development of diode-pumped high brightness watt-level visible Praseodymium fiber lasers.

Tunable luminescence in Pr3+ single-doped oxyfluoride glass ceramic and fibers

“…2d, the emission spectra of the Pr 3+ doped glasses excited at 441 nm present a series of emission peaks, corresponding to the characteristic emission of Pr 3+ : 3 P 0 → 3 H 4 (∼482 nm), 3 P 1 → 3 H 5 (522 nm), 3 P 0 → 3 H 5 (538 nm), 3 P 0 → 3 H 6 / 1 D 2 → 3 H 4 (600 nm), 3 P 0 → 3 F 2 (641 nm) and 1 D 2 → 3 H 5 (694 nm). 18,35 It is interesting to note that disparate emission bands show different quenching concentrations in the PG samples. The intensity of 482 nm, 538 nm, 641 nm, and 694 nm emissions initially increased with increased Pr 3+ concentration but declined at 0.5 mol% and beyond.…”

3.6 W compact all-fiber Pr3+-doped green laser at 521 nm

“…1(a)], whereas the loss of the core is estimated to be ∼0.4 dB∕m at 521 nm. 10 In addition, the green laser was measured by the OSA (AQ-6315E, Ando), and the output power was recorded by a 350-to 1100-nm optical power meter (S425C-L, Thorlabs, Inc.).…”

“…1), and some are obtained from the literature. 10,20 The specific parameters are summarized in Table 1. After obtaining the simulation parameters, the shooting method and bvp4c function are used to solve Eqs.…”

“…Given recent advances in both rare-earth-doped fluoride fibers and blue GaN LD, frequency down conversion fiber lasers using trivalent rare-earth-doped fluoride fibers have emerged as a promising approach to directly generate visible-light emission, and much related work has been carried out and reported 8 – 14 Among them, Pr3+-doped fluoride fiber laser is particularly appealing for visible lasers because it has a reasonably simple 4f-energy level scheme and exhibits a variety of transitions in the blue, green, orange, and red spectral regions 8 . At present, based on double-clad (DC) Pr3+-doped fluoride fiber, the high-power red fiber laser operating at 635.5 nm with a maximum output power of 2.3 W has been achieved 13 .…”

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

“…Soon afterward, fundamental studies based on Pr-doped waterproof fluoride fibers in the visible waveband have been increasing remarkably and the output power in the red, green and blue bands has reached over 1.0 W. In 2019, a 2-W single-mode visible laser oscillator (@638 nm) based on the waterproof Pr-doped fiber was reported [146]. Up to now, the highest power record for visible fiber lasers reaches 2.3 W at 635.5 nm [141][142][143][144][145][146][147][148][149], corresponding to a singlemode spatial mode and a narrow linewidth of 0.16 nm. Further optimization on the laser cavity could result in higher output power approaching the 10-W level according to simulation results.…”