Articles you may be interested inUpconversion emission in Er-doped and Er/Yb-codoped ferroelectric Na0.5Bi0.5TiO3 and its temperature sensing application Intense green and red upconversion emission of Er3+,Yb3+ co-doped CaZrO3 obtained by a solution combustion reactionThe spectroscopic parameters of Er"+-doped crystals were determined with regard to the upconversion laser parameters of the green transition 4S,,,-+4Z,5,2. The intluence of excited-state absorption on this laser channel was determined. Furthermore, upconversion pump mechanisms using ground-state and excited-state absorption around 810 and 970 nm were investigated by direct measurements of excited-state absorption. The spectroscopic results confirm the pulsed room-temperature laser experiments on the 4S3,2--+4Z r5,z transition. The lasers based on Er:LiYF,, Er:Y&Orl, and Er:Lu3A150r2 were directly excited into the upper laser level by an excimer laser pumped dye laser in the blue spectral range. In Er:LiYF4, Er:KYF4, and Er:Y3A150r2, laser action was achieved with two-step upconversion pumping by a Ti:sapphire laser and a krypton ion laser. In the case of the fluorides, the additional pumping with the krypton ion laser was not necessary. The laser emission wavelengths were 551 nm for Er:LiYF4, 561 nm for Er:Y3A150r2 and Er:Lu,AlsO1,, and 562 nm for Er:KYF4. In addition, green quasi-cw laser emission of Er:LiYF, pumped with an argon-ion laser was realized at room temperature.

We report room-temperature upconversion pumped continuous wave laser emission of 1% Er3+:LiYF4 at 551 nm excited by a Ti:sapphire laser at 810 nm. Output powers of up to 40 mW with output coupling of 6.6% have been obtained by using nearly concentric resonator design.

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Blue and green cw upconversion lasing in Er:YLiF 4

We report the first demonstration of a green erbium-doped crystal laser at room temperature. Excited with a pulsed dye laser, the erbium-doped LiYF4 crystal emitted on the 4Sj,2-4115,2 ground state transition. As expected from fluorescence measurements, the emitted radiation was polarized parallel to the optical axis. Laser oscillation has also been observed in erbium-doped Y&O,z and LuXA1,0i2 crystals.