Cr^4+:YAG double-clad crystal fiber laser

Abstract

We report what we believe to be the first demonstration of a room-temperature, continuous-wave Cr(4+):Y(3)Al(5)O(12) (Cr(4+):YAG) double-clad crystal fiber laser grown by the codrawing laser heated pedestal growth method. The threshold is below 100 mW, which is a factor of 4 lower than previously reported Cr(4+)-doped lasers. A slope efficiency of 6.9% was obtained, and is in good agreement with the numerical simulation. In additional to small core diameter, the low-threshold lasing is made possible by the low propagation loss of 0.08 dB/cm and the high crystallinity of the core.

Strain-Dependent Fluorescence Spectroscopy of Nanocrystals and Nanoclusters in Cr:YAG Crystalline-Core Fibers and Its Impact on Lasing Behavior

“…The equation employed to simulate the lasing behavior of the Cr:YAG DCF in Figure 8b was a quasi-four-level lumped model. 14 The simulation results were in very good agreement with the obtained strain-induced reduction in τ f and σ e , demonstrating that the strain-dependent Cr 4+ fluorescence properties of the Cr 4+ :YAG DCF is responsible for the observed lasing behaviors.…”

Defect-driven fiber-based UV-VIS broadband white light generation

“…With three diameter reduction steps by the LHPG technique [2], [3], a 40-μm Ti:sapphire single crystalline core was grown in an ambient (i.e., oxidizing) atmosphere. At this stage, the nominal concentration of Ti in the sample was decreased to be ~50 ppm, because of the Ti ions evaporate out during the LHPG process.…”

Glass-clad crystal fibers based ultrahigh resolution optical coherence tomography

“…They were then gone through a codrawing LHPG process to form DCFs. During the codrawing process, the DCF cores were further reduced to 5 to 20 μm depending on applications [4]- [9]. As shown in Fig.…”