Direct generation of 3.17  mJ green pulses in a cavity-dumped Ho³⁺-doped fiber laser at 543  nm

Abstract

High-energy pulsed lasers in the green spectral region are of tremendous interest for applications in space laser ranging, underwater detection, precise processing, and scientific research. Semiconductor pulsed lasers currently are difficult to access to the so-called “green gap,” and high-energy green pulsed lasers still heavily rely on the nonlinear frequency conversion of near-IR lasers, precluding compact and low-cost green laser systems. Here, we address this challenge by demonstrating, for the first time to the best of our knowledge, millijoule-level green pulses generated directly from a fiber laser. The green pulsed fiber laser consists of a 450 nm pump laser diode, a Ho3+-doped ZBLAN fiber, and a cavity-dumping module based on a visible wavelength acousto-optic modulator. Stable pulse operation in the cavity-dumping regime at 543 nm is observed with a tunable repetition rate in a large range of 100 Hz–3 MHz and a pulse duration of 72–116 ns. The maximum pulse energy of 3.17 mJ at 100 Hz is successfully achieved, which is three orders of magnitude higher than those of the rare-earth-doped fiber green lasers previously reported. This work provides a model for compact, high-efficiency, and high-energy visible fiber pulsed lasers.

Effect of P/Al ratio on the X‐ray induced darkening in Dy‐doped silica glasses at visible wavelengths

“…Among laser system, fiber lasers show advantages in high beam quality and compact structure. Fluoride glass fiber is an attractive host for visible laser due to its broad transmission window from ultraviolet (UV) to mid‐infrared region, 10–13 and the Dy 3+ ‐doped fluoride fiber has demonstrated the continuous‐wave yellow laser with watt‐level output power (1.12 W) at 575 nm 14 . However, the difficulty of synthesis, poor mechanical strength, and degraded chemical stabilities have limited the practical applications of fluoride glass as host for fiber lasers.…”

Coordination engineering in Nd3+-doped silica glass for improving repetition rate of 920-nm ultrashort-pulse fiber laser

“…Owing to their excellent performance in terms of short pulse duration and high peak power, ultrashort pulse lasers have gained much attention in the fields of fiber-optics communication, biophotonics, and industrial processing 1 – 8 Recently, because of the advantages of compactness, robustness, and freedom from maintenance over conventional solid-state lasers, 9 – 13 fiberized ultrashort pulses operating in the wavelength range from 900 to 950 nm produced by passive mode-locking techniques have become highly desirable for use in two-photon bioimaging (TPM) systems for the efficient excitation of green fluorescent proteins and their variants 14 – 18 Combined with nonlinear frequency conversion, 1.0-μm Yb3+-doped, 12 1.5-μm Er3+-doped, 19 and 1.9-μm Tm3+-doped 10 , 13 ultrashort fiber lasers have been utilized to achieve 900- ∼950-nm ultrashort pulses, which have propelled the advances of TPM systems, with the only drawback being the reduced all-fiber configuration as a result of using these additional nonlinear media.…”