Ho:YAG ceramic laser pumped by Tm:YLF lasers at room temperature

Abstract

Lasers from Ho:YAG ceramic were reported in this paper. The Ho:YAG ceramic slab was end-pumped by a Tm:YLF laser whose central wavelength was 1.91 μm. At room temperature, with doping concentrations of 1 at.% Ho:YAG ceramic slab, continuous wave output power of 1.2 W at 2.09 μm was obtained under the absorbed pump power of 5 W, corresponding to a slope efficiency of 42.6% and a conversion efficiency of 24%.Relative intensity, a.u.

Fabrication, properties and laser performance of Ho:YAG transparent ceramic

“…Holmium-doped yttrium aluminum garnet (Ho:YAG) ceramic is the promising material of choice for 2.1 m applications due to its well-known excellent thermomechanical properties and advantages compared with Ho:YAG single crystal (for example: ease of fabrication, less cost, mass production, feasibility of large size, high holmium concentration, etc.). The laser performance of Ho:YAG ceramic has been reported in Dr. Cheng's work with the specimen we provided [19]. And to the best of our knowledge, fabrication and properties of highly transparent Ho:YAG ceramic has not been reported yet.…”

High power Tm:YLF bulk laser wavelength-stabilized by two F-P etalons

“…Diode dual-end-pumped Tm:YLF laser is a excellent 1.9 m source, because the thulium-doped crystals have high absorption peaks at 790 nm which is just the emission wavelength of the fiber coupled output diode laser [7,8]. The 1.9 m Tm:YLF laser can efficiently pump the holmium laser [12][13][14]. Especially, its emission lines have a good overlap with the main absorption lines of Ho:YAG [15].…”

High repetition rate, Q-switched Ho:YAG laser resonantly pumped by a 20 W linearly polarized Tm: fiber laser

“…In recent years, high efficiency Ho oscillators in different configurations based on several hosts as YAG [16,17], YLF [18,19], YAP [20], LuAG [21], LLF [22], LSO [23], ceramic [24], and silica fiber [25,26] have been developed and reported. If we are talking about Ho:YAG lasers, it seems that diode-pumped Tm-doped bulk lasers [27,28] and Tm-doped fiber lasers [29] seem to be the most attractive sources for direct pumping.…”