Laser performance of in-band pumped Er : LiYF₄and Er : LiLuF₄crystals

Abstract

Abstract. Spectroscopic properties of Er : LiLuF 4 and Er : LiYF 4 crystals in the spectral region near 1.5 mm and the lasing characteristics of these crystals under in-band pumping at a wavelength of 1522 nm are studied. With the Er : LiLuF 4 crystal, the maximum slope efficiency with respect to the absorbed pump power was 44 % at a wavelength of 1609 nm. Continuous-wave operation of an inband pumped Er : LiYF 4 laser is obtained for the first time. The output power at a wavelength of 1606 nm was 58 mW with a slope efficiency of 21%.

Er3+ doped sesquioxide Y2O3 optical ceramics: synthesis and spectral-luminescent properties

“…If we assume that the luminescence quantum yield at the 4 I13/2→ 4 I15/2 transition of Er3+ ions is close to unity, the luminescence decay time obtained as a result of measurements can be used as an estimation of the radiation lifetime 𝜏𝜏 of the 4 I13/2 energy level [5,8]. The stimulated emission cross section spectra 𝜎𝜎 𝑒𝑒𝑒𝑒 (λ) of Er3+ in region about 1.5 μm (transition 4 I13/2→ 4 I15/2) calculation was carried out according to (2) with previously obtained absorption cross sections 𝜎𝜎 𝑎𝑎𝑎𝑎𝑎𝑎 (λ) and the radiative lifetime τ:…”

“…Single crystals that are widely used in laser technology, such as oxides YAG, YVO4, fluorides LiSAF, YLF etc., although easily doped with erbium, they are effective only in a four-level scheme at a wavelength of about 3 μm (transition 4 I11/2→ 4 I13/2). In crystalline media, highly efficient generation in the region of 1.5÷1.6 microns is possible only with resonant laser pumping in the 1.5 microns spectral range [4,5]. From Figure 1 it can be seen that proposed milling mode makes it possible to obtain a uniform fraction of Y2O3 powder from the initial powder with a larger grain size of tens of micrometers.…”

Оптическая спектроскопия ионов Er-=SUP=-3+-=/SUP=- в кристаллах BaY-=SUB=-1,8-=/SUB=-Lu-=SUB=-0,2-=/SUB=-F-=SUB=-8-=/SUB=-

“…Ионы эрбия позволяют достичь эффективного лазерного излучения в диапазоне длин волн около 1.5 и 2.7 µm [1,2]. В свою очередь лазеры, излучающие в инфракрасном диапазоне, являются основой для создания лазерных газоанализаторов, используемых в дифференциальной оптической абсорбционной спектроскопии для определения парниковых газов и воды.…”

Evaluation of Growth, Thermal, and Spectroscopic Properties of Er3+-Doped CLNGG Crystals for Use in 2.7 μm Laser

“…By far, various Er 3+ -doped gain materials had been reported, such as the garnet (crystals and ceramics) YAG [5], GGG [6], LuGG [7], YGG [8], YSGG [9][10][11][12], GSGG [13,14], the sesquioxide (crystals and ceramics) Y 2 O 3 [15,16], Lu 2 O 3 [17], and the fluoride (crystals, ceramics, and fibers) CaF 2 [18,19], SrF 2 [20], LiYF 4 [21], ZBLAN [22]. However, the fluorescence lifetime of the upper laser level 4 I 11/2 is much shorter than that of the lower laser level 4 I 13/2 , which is considered to be self-terminating, making the population inversion difficult and impeding laser oscillations.…”