Zhoubin Lin

Optical study of Cr3+-doped LaSc3(BO3)(4) crystal

This paper reports on the optical properties of Cr3+-doped LaSc3(BO3)4 (Cr3+:LSB). Based on measurement of the absorption spectrum the crystal field strength Dq, the Racah parameters B and C were calculated. The photoluminescence spectrum of Cr3+:LSB via 4T2→4A2 transition is a broadband emission from 740 to 1280 nm at room temperature. The measurements of absorption and photoluminescence spectra show that in Cr3+:LSB the Cr3+ ions occupy weak crystal field sites.

Crystal growth and optical assessment of Nd3+ :GdAl3(BO3)4 crystal

This paper reports the high-temperature top-seeded solution growth (TSSG) of large single crystal of Nd3+-doped GdAl3(BO3)4 from a K2Mo3O10-LiF flux cooled at a rate of 2 K/day and using a crystal rotation rate of 4.5 rpm. Thepolarized optical absorption and fluorescence spectra of Nd3+ : GdAl3(BO3)4 crystal have been investigated. Polarized absorption cross sections are 4.3x10-20 and 2.6x10-20 cm2 with band widths of 8.7 and 6.1 nm for σ- and π-polarization, respectively. The emission cross sections are 6.3x10-19 and 6.0x10-19 cm2 for σ- and π-polarization, respectively, at 1062 nm corresponding to the 4F3/2→4I11/2 transition. The fluorescence lifetime is 54.3 and 57 μs at 300 and 20 K, respectively.

Growth and spectroscopic characterization of Er3+: Ca3La2(BO3)4 crystal

Er3+: Ca3La2(BO3)4 crystals with dimensions of ∅20 × 30 mm3 were grown by the Czochralski method. The spectral properties of these crystals were investigated and their spectroscopic parameters were calculated and analysed based on the Judd–Ofelt theory. The oscillator intensity parameters Ωt were calculated to be Ω2 = 7.18 × 10−20 cm2, Ω4 = 3.27 × 10−20 cm2 and Ω6 = 2.79 × 10−20 cm2. The emission cross-section of a Er3+: Ca3La2(BO3)4 crystal was estimated to be 9.06 × 10−21 cm2 at 1535 nm. The fluorescence lifetime and radiative lifetime of the 4I13/2 → 4I15/2 transition are 0.63 ms and 2.68 ms, respectively. The Er3+-doped Ca3La2(BO3)4 crystals may be regarded as 1.55 µm laser gain medium materials.

Spectral parameters of Nd3+ ion in β-Nd3+:LaSc3(BO3)4 crystal

Abstract The spectroscopic study of Nd 3+ in β-Nd 3+ :LaSc 3 (BO 3 ) 4 crystal has been performed. Based on Judd–Ofelt theory, the spectral parameters were obtained: the parameters of line strengths Ω λ are Ω 2 =2.85×10 −20 cm 2 , Ω 4 =3.69×10 −20 cm 2 , Ω 6 =4.73×10 −20 cm 2 , the radiative lifetime is 226 μs, thus, the quantum efficiency is 49.4%, and the fluorescence branch ratios were calculated: β 1 =0.397, β 2 =0.499, β 3 =0.099.

Growth and spectroscopic characterizations of Nd3+-doped BaGd2(MoO4)(4) crystal

Nd3+ : BaGd2(MoO4)(4) crystal with dimensions of diameter 20mm x 28mm has been grown by the Czochralski method. The absorption and fluorescence spectra of Nd3+ : BaGd2( MoO4) 4 crystal were investigated. The absorption band at 807 nm has a FWHM of 5 nm, which is suitable for AlGaAs diode-laser pumping. The absorption cross section sigma(ab) is 3.42 x 10(-20) cm(2)at 807 nm. The emission cross section sigma(em) is 2.21 x 10(-19) cm(2) at 1065 nm. Based on the Judd-Ofelt theory, the spectral parameters have been calculated. The oscillator intensity parameters Omega(lambda) are Omega(2) = 14.96 x 10(-20) cm(2), Omega(4) = 5.04 x 10(-20) cm(2) and Omega(6) = 3.58 x 10(-20) cm(2) The radiative lifetime is 156 mu s and quantum efficiency eta(c) = 83.3%. Nd3+ : BaGd2( MoO4)(4) crystals have a low fluorescence quenching effect and can be doped with more Nd3+ ions. The above results suggest that the Nd3+ : BaGd2(MoO4)(4) crystal may be regarded as a potential solid-state laser material for diode laser pumping.

Structure and spectral properties of Nd3+-doped KBaGd(MoO4)3 crystal with a disorder structure

In order to obtain new, more efficient laser materials for diode laser-pumped lasers, the laser host materials with broad absorption bands are very important. This paper reports the structure and spectral properties of Nd3+ : KBaGd(MoO4)3 crystal. KBaGd(MoO4)3 crystallizes in the monoclinic system with space groupC2/c. The structure analysis shows that KBaGd(MoO4)3 crystal has a disordered structure. The investigation of the spectral properties of Nd3+ : KBaGd(MoO4)3 crystals shows that it exhibits broad absorption and emission bands, which are caused by the disordered structure of the KBaGd(MoO4)3 crystal. The broad absorption band is very suitable for diode laser pumping. To sum up the spectral properties of Nd3+ : KBaGd(MoO4)3 crystal, it may be regarded as a potential solid-state laser material for diode laser pumping.

Crystal growth, spectral properties and crystal field analysis of Cr3+:MgWO4

Cr3+ ion doped MgWO4 crystal with dimensions of 3 × 3 × 20 mm3 has been grown for the first time. The Cr3+:MgWO4 crystal showed strong absorption in the visible range and strong emission in the near-infrared range. The absorption and emission cross section of this crystal are 8.86 × 10−20 cm2 and 41 × 10−20 cm2 at 740 nm and 993.6 nm, respectively. Energy transfer procedure between Cr3+ ion and the defect center in the host crystal has been demonstrated. The crystal field, electron-vibration coupling and energy levels of the Cr3+:MgWO4 crystal are discussed.

Structure Of Ba3Y2(BO3)4 Crystal

The rapid development of solid-state laser with diode-laserpumped has resulted in the interesting search for more efficient solid-state laser materials for various applications. Recently, research has focused on the various borate crystals. As is well known, the detailed data of crystal structure are not only essential to the theoretical calculation of crystal field parameters, but also important to the study of the microscopic processes of energy transfer between rare earth ions. This paper reports on the detailed structural data of Ba 3 Y /B0 3 ) 4 crystal.

Characterization of growth, optical properties, and laser performance of monoclinic Yb:MgWO 4 crystal

We present, to the best of our knowledge, the first report on the crystal growth, spectroscopic investigation, and laser performance of Yb-doped MgWO4 monoclinic crystal. A top seeded solution growth method was employed to develop a high quality monoclinic crystal. The spectroscopic properties were characterized in terms of absorption, photoluminescence, and lifetime measurement. Corresponding emission and gain cross-sections were calculated. Lasing behavior has been investigated in continuous-wave regime with the maximum output power of 2.52 W and a slope efficiency of 52.8%.

Crystal growth, optical spectroscopy and laser action of Tm^3+-doped monoclinic magnesium tungstate

We report on the crystal growth, spectroscopic investigation and laser performance of Tm3+-doped monoclinic magnesium tungstate (Tm:MgWO4), for the first time, to the best of our knowledge. A high-quality crystal has been grown by the top seeded solution growth method. The relevant spectroscopic properties are characterized in terms of absorption, luminescence and Raman spectroscopy. Judd-Ofelt (J-O) analysis is performed to evaluate the spontaneous emission probabilities and the radiative lifetimes. The absorption, stimulated-emission and gain cross-section spectra are determined for the principal light polarizations. The first laser action in the 2 μm spectral range is demonstrated in the regime of continuous-wave operation with a maximum output power of 775 mW and a slope efficiency of 39%.