High efficiency diode-pumped Q-switched Yb:Er:Glass lasers

Boutchenkov, Vyatcheslav A.; Kuchma, I. G.; Levoshkin, A. V.; Mak, A. A.; Petrov, A. A.; Hollemann, G.

doi:10.1016/s0030-4018(00)00608-8

Cited by 22 publications

(9 citation statements)

References 13 publications

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“…The pumping is performed at a low repetition rate (1 Hz) and the duration of a single pump pulse is about a few ms. The simplified scheme of the energy levels of Er 3+ and Yb 3+ ions is shown in figure 1 and the corresponding system of the rate equations is [10]: [10,18]; the non-radiative relaxation from the 4 I 13/2 state to the lower-lying multiplet is considered as a single depopulation channel for this state. The parameters used for the calculation are listed in table 1.…”

Section: Modeling Gain In the Active Elementmentioning

confidence: 99%

“…Er lasers have found their recognized applications in free-space optical communication, remote sensing (LIDAR technology), wind sensing and range-finding [2][3][4][5][6][7] in civil and military fields. The requirements for rangefinders operating at low pulse frequencies include a high pulse energy and peak power, good beam quality and low divergence, as well as a compact and robust design, preferentially with passive cooling of a laser head [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Compact 0.7 mJ/11 ns eye-safe erbium laser

et al. 2016

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We report on the development of a compact diode-end-pumped eye-safe (~1.54 µm) passivelycooled Er,Yb:glass laser. The design of this laser is facilitated by the use of a double-pass pumping scheme and a special ZrO 2 diffuse reflector for a uniform pump distribution. In the free-running mode, this laser generates 8.2 mJ/3 ms pulses with a slope efficiency of 15%. Passive Q-switching is provided by saturable absorbers made of transparent glass-ceramics containing Co 2+ :γ-Ga 2 O 3 or Co 2+ :MgAl 2 O 4 nanocrystals with a spinel structure. In the latter case, 0.7 mJ/10.5 ns pulses are generated corresponding to >60 kW peak power and good beam quality (M 2 = 1.4). The designed laser is suitable for portable range-finders.

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Section: Modeling Gain In the Active Elementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact 0.7 mJ/11 ns eye-safe erbium laser

et al. 2016

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“…16 The magnitude of the magnetic dipole transition is independent of ligand fields while that of the electric dipole transition is a function of ligand fields. 17 According to Judd-Ofelt theory, the line strength of the electric dipole component in the 4 I 13/2 3 4 I 15/2 transition of Er 3ϩ is given by the following equation: 9 S ed ͓ 4 I 13/ 2 , 4 I 15/ 2 ͔ ϭ 0.0188⍀ 2 ϩ 0.01176⍀ 4 ϩ 1.4617⍀ 6 (2) Consequently, for the electric dipole 4 I 13/2 3 4 I 15/2 transition of Er 3ϩ , the ⍀ 6 parameter is dominant. It can be seen from Eq.…”

Section: (2) Fluorescence Lifetime and Radiative Transition Ratementioning

confidence: 99%

“…As a result of these investigations, some Er-doped glasses have been widely used not only as a fiber amplifier material 4 but also as a bulk laser material. 5,6 The search for more efficient laser action demands further improvements of optical, thermal, and mechanical properties of host glasses. Lanthanum aluminosilicate glasses (LAS), which have been investigated, are good glass laser hosts 7 with high glass transformation temperature, high mechanical strength, and high thermal conductivity coefficient.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Properties of Er³⁺‐Doped Na₂O–La₂O₃–Al₂O₃–SiO₂ Glasses

Zhang

Bao-yu

Liu

et al. 2004

Journal of the American Ceramic Society

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Er3+‐doped sodium lanthanum aluminosilicate glasses with compositions of (90−x)(0.7SiO2·0.3Al2O3)·xNa2O·8.2La2O3· 0.6Er2O3·0.2Yb2O3·1Sb2O3 (in mol%) (x= 12, 20, 24, 40, 60 mol%) were prepared and their spectroscopic properties were investigated. Judd–Ofelt analysis was used to calculate spectroscopic properties of all glasses. The Judd–Ofelt intensity parameter Ωt (t= 2, 4, 6) decreases with increasing Na2O. Ω2 decreases rapidly with increasing Na2O while Ω4 and Ω6 decrease slowly. Both the fluorescent lifetime and the radiative transition rate increase with increasing Na2O. Fluorescence spectra of the 4I13/2 to 4I15/2 transition have been measured and the change with Na2O content is discussed. It is found that the full width at half‐maximum decreases with increasing Na2O.

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“…Влияние тепловой линзы (ТЛ) в первую очередь сказывается на увеличе-нии расходимости выходного лазерного излучения, а другие термооптические неоднородности и вынуж-денное двулучепреломление, проявляющееся в Yb-Er активном элементе при высоких энергиях накачки, приводят к снижению эффективности генерации. В различных работах [6][7][8][9] описываются особенности работы малогабаритных неохлаждаемых лазеров на Yb-Er-стекле в условиях термооптических искаже-ний активных элементов. Очевидна необходимость их учета при расчете лазерных оптических систем, таких, например, как лазерные дальномеры с дальностью работы до нескольких десятков километров.…”

Section: Introductionunclassified