Tunable CW Er:YLF Diode-Pumped Laser

Abstract

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LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals

“…In contrast to -NaYF4, Czochralski-grown crystals of lanthanide-doped LiYF4 are commercially available from various suppliers and widely used as solid state laser materials. Well-known examples are LiYF4:Pr [13][14][15][16][17][18][19][20], LiYF4:Nd [21][22][23][24][25][26][27][28][29], LiYF4:Yb [30][31][32][33][34][35], LiYF4:Er [36][37][38][39][40][41][42][43], LiYF4:Ho [44][45][46][47][48][49][50] and LiYF4:Tm [51][52][53][54][55][56]. LiYF4 laser crystals are grown under strict exclusion of water and humidity to avoid the incorporation of OH − into the fluoride lattice which is a well-known luminescence quencher owing to its highfrequency vibrational modes [57,58].…”

A stable gain-switched Ho:CYA laser resonantly pumped at 1922 nm

“…Compared to Tm 3+ doped crystals or glass fibers, Ho 3+ doped crystals provide higher gain and a much better energy storage capability, which make them more attractive for pulsed laser operation [3]. Ho 3+ doped YAG, YLF and LuAG crystals have been employed as a gain medium for high power continuous wave (CW) and pulsed lasers operating at ~2.1 µm in the past few years [4][5][6][7]. Recently, CaYAlO 4 (CYA) has attracted much attention as a new laser crystalline host.…”

Single Longitudinal Mode and Widely Tunable Er:Y2O3 Ceramic Laser at ∼ 2.7 μm

“…the well-developed ∼980 nm laser diodes [2], [3], [4], [5], [6], [7]. Among the developed Er-doped host materials, cubic sesquioxide (Y 2 O 3 , Sc 2 O 3 and Lu 2 O 3 ) ceramics are attractive owing to their high thermal conductivity (e.g., 13.4 W m −1 K −1 for Y 2 O 3 ), the reduced non-radiative decay rate resulting from their low phonon energies (591 cm −1 for Y 2 O 3 ), as well as the relatively lower optimum Er 3+ doping level and hence reduced instabilities originated from heat deposition [8], [9], [10].…”