Direct generation of watt-level yellow Dy³⁺-doped fiber laser

Abstract

Yellow lasers ( ∼ 565 – 590 nm ) are of tremendous interest in biomedicine, astronomy, spectroscopy, and display technology. So far, yellow lasers still have relied heavily on nonlinear frequency conversion of near-infrared lasers, precluding compact and low-cost yellow laser systems. Here, we address the challenge through demonstrating, for the first time, to the best of our knowledge, watt-level high-power yellow laser generation directly from a compact fiber laser. The yellow fiber laser simply consists of a Dy 3 + -doped ZBLAN fiber as gain medium, a fiber end-facet mirror with high reflectivity at yellow and a 450-nm diode laser as the pump source. We comprehensively investigated the dependence of the yellow laser performance on the output coupler reflectivity and the gain fiber length and demonstrated that the yellow fiber laser with an output coupler reflectivity of 4% and a gain fiber length of ∼ 1.8 m yields a maximum efficiency of 33.6%. A maximum output power of 1.12 W at 575 nm was achieved at a pump power of 4.20 W. This work demonstrated the power scaling of yellow Dy 3 + -doped ZBLAN fiber lasers, showing their promise for applications in ophthalmology, astronomical exploration, and high-resolution spectroscopy.

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

“…In 2021, the first compact watt-level highpower yellow fiber laser was presented, in which a piece of Dy-ZBLAN fiber was adopted as the gain medium. The maximum output power of 1.12 W at 575 nm was obtained at a pump power of 4.20 W provided by a 450-nm pumping source, which yields a maximum efficiency of 33.6% [150].…”

Diode pumped silicate fiber for visible laser emission

“…3(b) presents the result of the application of the Füchtbauer-Ladenburg equation to the fluorescence spectrum, using literature-sourced spectroscopic values. The peak emission cross section of 1.2 × 10 25 m 2 occurs at 581 nm, which is red shifted by approximately 8 nm relative to ZBLAN glass [14]. It is important to note that the cross section at 589 nm, an important wavelength for guide star applications, is approximately 82% of the peak value.…”

“…Recently, ZBLAN fiber lasers operating on this transition are receiving a resurgence of interest because of increased fiber quality and the widespread availability of GaN laser diodes emitting around 450 nm. This has led to recent demonstrations of both high efficiency [13] and Watt-level output power [14].…”

Study on corrosion process and mechanism of fluoride laser glass fiber

“…In recent years, researchers have made significant progress in fluoride glass fiber applications. The 41.6 W maximum power continuous-wave laser around 2.8 μm was realized in an Er 3+ -doped ZBLAN fiber [1][2][3][4][5]. After decades of development, a significant improvement in fluoride fiber quality has been achieved, especially the background attenuations of the fiber.…”