Efficient 1 W continuous-wave diode-pumped Er,Yb:YAl3(BO3)4 laser

We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er:Yb:YAl3(BO3)4 crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb3+ to Er3+ ions were determined. A CW Er:Yb:YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1 W and slope efficiency up to 35% was demonstrated

Эрбиевый лазер, излучающий в области 1.5 мкм, с высокой выходной мощностью

Solid-state lasers emitting in the 1.5–1.6 μm spectral range are very promising for eye-safe laser range finding, ophthalmology, fiber-optic communication systems, and optical location. The aim of this work is the investigation of spectrosposcopic and laser properties of gain medium based on borate crystal for abovementioned lasers.Spectroscopic and laser properties of Er,Yb:YAl3(BO3)4 crystals with different concentrations of dopants were investigated. Polarized absorption and emission cross-section spectra were determined. The ytterbium- erbium energy transfer efficiency was estimated. The maximal energy transfer efficiency up to 97 % was obtained for Er(4 at.%),Yb(11 at.%):YAl3(BO3)4 crystal.The laser operation of heavily doped crystals with erbium concentration up to 4 аt.% (2.2^1020 cm^3) was realized. By using of Er(2 at.%),Yb(11 at.%):YAl3(BO3)4 crystal a maximal continuous- wave (CW) output power of 1.6 W was obtained at 1522 nm with slope efficiency of 32 %. By using of Er(4 at.%),Yb(11 at.%):YAl3(BO3)4 crystal a maximal peak output power up to 2.2 W with slope efficiency of 40 % was realized in quasi-continuous-wave regime of operation. The spatial profile of the output beam was close to TEM00 mode with M2 < 1.2 during all laser experiments.Based on the obtained results, it can be concluded that Er,Yb:YAl3(BO3)4 crystals are promising active media for lasers emitting in the spectral range of 1.5-1.6 pm for the usage in laser rangefinder and laser- induced breakdown spectroscopy systems, and LIDARs.Твердотельные лазеры, излучающие в спектральной области 1.5‒1.6 мкм, находят широкое применение в дальнометрии, офтальмотологии, волоконно-оптических системах и оптической локации. Целью данной работы являлось исследование спектроскопических и генерационных свойств активной среды на основе кристалла бората для указанных лазеров.Проведено исследование спектроскопических и генерационных свойств кристаллов Er,Yb:YAl3(BO3)4 с различным содержанием ионов-активаторов. В результате определены спектры поперечных сечений поглощения и стимулированного испускания в поляризованном свете. Проведена оценка эффективности переноса энергии от ионов иттебия на ионы эрбия. Максимальная эффективность переноса энергии достигала 97 % для кристалла Er(4 at.%),Yb(11 at.%):YAl3(BO3)4.Реализована   лазерная   генерация   для   кристаллов   с   высоким   содержанием   ионов   эрбия до 4 ат.% (2.2∙1020 cм‒3). При использовании кристалла Er(2 at.%),Yb(11 at.%):YAl3 (BO3)4 получен непрерывный режим генерации с максимальной выходной мощностью до 1,6 Вт на длине волны 1522 нм при дифференциальной эффективности 32 %. В квазинепрерывном режиме генерации для кристалла Er(4 at.%),Yb(11 at.%):YAl3(BO3)4 максимальная пиковая мощность достигала 2,2 Вт при дифференциальной эффективности по поглощённой мощности накачки 40 %. Профиль распределения интенсивности в поперечном сечении лазерного пучка хорошо аппроксимировался функцией Гаусса рассчитанное значение параметра распространения лазерного пучка М2 не превышало 1,2, что соответствует ТЕМ00 моде резонатора.На основе полученных результатов, можно сделать вывод, что данные кристаллы являются перспективными активными средами, для лазеров, излучающих в спектральном диапазоне 1.5‒1.6 мкм, для применения в составе систем лазерной дальнометрии, лазерно-искровой эмиссионной спектрометрии и лидаров

Crystal growth and spectroscopic characterization of Yb:YMgB5O10

A transparent Yb:YMgB5O10 single crystal with dimensions up to 25×23×25 mm was grown. Absorption cross-section spectra were produced. The luminescence spectra of the Yb: YMgB5O10 crystal were measured in the spectral range of 950–1100 nm. The luminescence kinetics of the 2F5/2 energy level were investigated and the lifetime was determined

X-ray crystal structure of synthetic REEAl2.07(B4O10)O0.60 (REE = (La,Ce); Ce; Nd) dimetaborates

Nonstoichiometric REEAl(2.07)(B(4)O(10))O(0.60) (REE = (La, Ce); Ce; Nd) dimetaborates have been crystallized and analyzed by means of single crystal X-ray diffraction. The compounds resulted to be isostructural within hexagonal space group P (6) over bar 2m (n. 189), with the following unit cell parameters: a = 4.6060(6) angstrom, c = 9.3510(8) angstrom and V = 171.81(3) angstrom(3) (La, Ce); a = 4.5960(6) angstrom; c = 9.3170(10) angstrom and V = 170.44(4) angstrom(3) (Ce); a = 4.5830(7) angstrom, c = 9.2810(14) angstrom and V = 168.82(4) angstrom(3) (Nd). The REE cations are surrounded by six oxygen atoms, making up a trigonal prismatic coordination; Al cation is surrounded by five oxygen atoms, resembling a square pyramidal coordination, while the BO(4) group displays tetrahedral arrangement. The three-dimensional framework can be described as a mica-like structure packed down crystallographic axis c, with layers of six-membered rings of B tetrahedra alternated by inter-layers REE cations and layers of Al polyhedra. A complex network of REE center dot center dot center dot O and Al center dot center dot center dot O interactions concur to stabilize the framework

Эрбиевый лазер, излучающий в области 1.5 мкм, с высокой выходной мощностью

Solid-state lasers emitting in the 1.5–1.6 μm spectral range are very promising for eye-safe laser range finding, ophthalmology, fiber-optic communication systems, and optical location. The aim of this work is the investigation of spectrosposcopic and laser properties of gain medium based on borate crystal for abovementioned lasers. Spectroscopic and laser properties of Er,Yb:YAl3(BO3)4 crystals with different concentrations of dopants were investigated. Polarized absorption and emission cross-section spectra were determined. The ytterbiumerbium energy transfer efficiency was estimated. The maximal energy transfer efficiency up to 97 % was obtained for Er(4 at.%),Yb(11 at.%):YAl3(BO3)4 crystal. The laser operation of heavily doped crystals with erbium concentration up to 4 аt.% (2.2∙1020 cм‒3) was realized. By using of Er(2 at.%),Yb(11 at.%):YAl3(BO3)4 crystal a maximal continuouswave (CW) output power of 1.6 W was obtained at 1522 nm with slope efficiency of 32 %. By using of Er(4 at.%),Yb(11 at.%):YAl3(BO3)4 crystal a maximal peak output power up to 2.2 W with slope efficiency of 40 % was realized in quasi-continuous-wave regime of operation. The spatial profile of the output beam was close to TEM00 mode with M2 < 1.2 during all laser experiments. Based on the obtained results, it can be concluded that Er,Yb:YAl3(BO3)4 crystals are promising active media for lasers emitting in the spectral range of 1.5–1.6 μm for the usage in laser rangefinder and laserinduced breakdown spectroscopy systems, and LIDARs

Transitions intensities and cross-sections of Tb3+ ions in YAl3(BO3)4 crystal

A Tb3+:YAB crystal was grown using a high-temperature solution growth on dipped seeds technique. Polarized ground state absorption and fluorescence spectra from the 5D4 level, as well as a fluorescence decay curves of 5D4 and 5D3 levels, were recorded at room temperature. Radiative properties such as emission probabilities, branching ratios, and radiative lifetime were investigated within the theory of 4f-4f transition intensity in the case of the intermediate configuration interaction

A New generation of nonlinear optical and laser crystals of rare earth borate and tantalate families

RE:YAl₃(BO₃)₄ (RE = Yb, Er) and RETa₇O₁₉ (RE = Y, Nd, La) single crystals have been obtained using K₂Mo₃O₁₀ based flux by spontaneous nucleation as well as dipping seeded high-temperature solution growth. Their composition and physical characteristics were compared in light of the growth conditions. It was found that the average RE segregation coefficients vary from 0.80 to 1.02. The spectroscopic and stimulated emission properties of (Er,Yb):YAl₃(BO₃)₄ crystals have been investigated and efficient continuous-wave (CW) and Q-switched pulsed laser operation under diode pumping have been demonstrated. The absorption and emission spectra of Nd³+:YTa₇O₁₉ (Nd:YHT), and Nd³+:LaTa₇O₁₉ were measured at 10 and 300 K. The absorption and emission spectra of Nd:YHT, and NdTa₇O₁₉ were studied at 10 and 300 K and are discussed on the basis of the structural data. The room temperature spectra show a marked inhomogeneous broadening that makes these crystals promising for tunable solid-state laser applications.9 page(s

Efficient 1 W continuous-wave diode-pumped Er,Yb:YAl3(BO3)4 laser

We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er:Yb:YAl3(BO3)4 crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb3+ to Er3+ ions were determined. A CW Er:Yb:YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1 W and slope efficiency up to 35% was demonstrated