Blue light emission by a Pr : LiYF4 − laser operated at room temperature

Abstract

Room-temperature operation of a solid-state laser has been achieved for the first time in the blue region using Pr : YLF. The 0.2% Pr : YLF crystal was longitudinally pumped at 444 nm using a pulsed dye laser. Laser emission was observed at 479 nm and required a pump-energy density of 8 J/cm2 at threshold.

Upconversion excitations in Pr3+-doped BaY2F8 crystal

“…) 6 where W t0 and R 0 are the nearest-neighbor transfer rate and distance, respectively. By assuming W tG = W t0 and using the calculated transfer rates, the sequence of corresponding inter-ionic distances is calculated to be 3.705, 4.53, 5.13, 5.63 and 6.10 Å, which reproduces well the sequence of Pr-Pr distances in BaY 2 F 8 lattice, which are 3.705, 3.822, 4.264, 5.271, 5.649 and 6.148 Å.…”

“…Praseodymium activated crystals of SrAl 12 O 19 [5], LiYF 4 [6], GdLiF 4 [7], LaCl 3 [8] have been demonstrated to lase in the blue part of the spectrum between transitions from the excited 3 P 0 state to the ground 3 H 4 state under direct one photon excitation conditions. This blue emission at about 490 nm can also be excited using the frequency conversion processes due to energy transfer (ET), excited state absorption (ESA) or photon avalanche (PA) [2,4,9].…”

Luminescence and Lifetimes of Pr3+Excited States in KLa1-xPrx(MoO4)2and KLa1-xPrx(WO4)2Crystals

“…The 3G4-3Η5 transition at about 1.33 μm matches well the transmission window of optical fibres and may be involved in amplifucation of light in telecommunication systems. Other laser channels involving the 3Ρ0-3H4 transition at about 480 nm [1], and the 3Ρ0 -3H6 transition at about 640 nm [2][3][4][5] are particularly important since the emission is in the visible. Major shortcoming of Ρr 3 + lasers is related to the pumping efficiency.…”

Optical and laser properties of Pr3+:YLF crystal

“…The search for a suitable pump source turned out to be the main problem of all Pr 3+ -doped solid-state laser materials. Pr 3+ :YLF laser emitting at 479 nm was demonstrated using a pulsed dye laser as the pump source [9]. The Pr 3+ :YLF laser pumped by argon-ion laser was firstly reported by T. Sandrock et al in 1994 [10].…”