Laser action in LaAlO3:Nd3+ single crystal

Abstract

Optical absorption intensity analysis and emission cross sections for the intermanifold and the inter-Stark transitions of Nd 3 + ( 4 f 3 ) in polycrystalline ceramic Y 2 O 3The spectral and laser properties of Nd 3+ doped ͑1 wt %͒ LaAlO 3 single crystal are presented. The energy levels of the Nd 3+ ion in the LaAlO 3 matrix were assigned. The Judd-Ofelt parameters ⍀ 2 = 1.346, ⍀ 4 = 4.490, and ⍀ 6 = 5.168 ͑all ϫ10 −20 cm −2 ͒ were evaluated. The absorption abs and emission emi cross sections at the respective pumping and emission wavelengths were calculated to be abs ͑789.7 nm͒ = 2.42ϫ 10 −20 cm 2 , emi ͑909 nm͒ = 5.02ϫ 10 −20 cm 2 , and emi ͑1080 nm͒ = 7.03 ϫ 10 −20 cm 2 . Continuous-wave laser action at 1080 nm in LaAlO 3 :Nd 3+ was obtained.

Anomalous decays in Nd3+ doped LaAlO3 single crystal

“…The JO theory predicts radiative lifetime to be around 168 μs for the 4 F 3/2 level of Nd 3 þ doped LaAlO 3 [10]. Therefore, at room temperature we could confirm earlier results presenting low nonradiative rates and quantum efficiency close to unity [11] for perovskites.…”

“…One should therefore expect shorter LT at room temperature, where the phonon assisted processes become more significant than at lower temperatures. The experimental luminescence lifetimes vs. temperature behavior observed by us [10] and other authors [11] is however opposite to the expected one. Moreover, the physical mechanisms explaining the experimental results are not satisfying so far.…”

“…Spectral and laser properties of neodymium (Nd 3 þ ) doped LaAlO 3 were investigated by us recently [10]. Previously, the optical properties of similar neodymium doped LaXO 3 (X¼ Y, Ga, Al) perovskites were investigated by Garcia-Rubio et al [11] (Nd 3 þ : LaGaO 3 ), Dominiak-Dzik et al [12] (Nd 3 þ :LaGaO 3 ), and by Orera et al [13] (Nd 3 þ :LaGaO 3 and NdGaO 3 ).…”

Spectroscopic properties of Nd3+ in MgAl2O4 spinel nanocrystals

“…Decrease of the lifetime with temperature decreasing was also observed by the other authors [18][19][20]. They explained this phenomenon by taking into account decay time of the second component of the 4 F 3/2 level.…”

“…For calculation we took for 1 decay time measured at 77 K. The estimated from Eq. (3) lifetime 2 is equal 340 s, which is quite similar to values obtained by the other authors [18][19][20]. The calculations were done for sample with the lowest concentration of neodymium, to avoid the errors introduced by the concentration quenching processes.…”