| 1. |
- Basiev, T. T., et al.
(författare)
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Pre-selection of optical transitions in rare-earth ions in crystals perspective for quantum information processing
- 2012
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Ingår i: Journal of Modern Optics. - : Informa UK Limited. - 0950-0340 .- 1362-3044. ; 59:2, s. 166-178
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Tidskriftsartikel (refereegranskat)abstract
- A systematic analysis of decoherence rates due to electron-phonon interactions for optical transitions of rare-earth dopant ions in crystals is presented in the frame of the point charge model. For this model, the large value of any one of the matrix elements of the unit tensor operator U((k)) of rank k for transitions within the 4f-electronic configuration, viz. U2, U4 or U6, is enough to ensure the strong optical transition between different levels, while the Stark-Stark transitions within the multiplet can be characterized by the matrix element U2 alone, the influence of elements U4, U6 being of much smaller order of magnitude and neglected. The circumstance that exactly such Stark-Stark transitions within the multiplet define the efficiency of electron-phonon interaction and, consequently, the decoherence rate (except for the case of lowest, less than approximately 2-4 K, temperatures), enables selection of optical transitions which are strong enough and at the same time are characterized by relatively small decoherence rates. Correspondingly, these optical transitions, provided that they lie in an appropriate spectral range and the gap to the nearest neighboring energy level is large enough (>500 cm(-1)) to prevent eventual fast phonon-assisted relaxation, should be considered as prospective for subsequent use in quantum informatics processing and communication. The list of such pre-selected transitions is given; the applicability area and limitations of our approach are discussed.
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| 2. |
- Karlsson, G., et al.
(författare)
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Diode-pumped Er-Yb : glass laser passively Q switched by use of Co2+: MgAl2O4 as a saturable absorber
- 2000
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Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 39:33, s. 6188-6192
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Tidskriftsartikel (refereegranskat)abstract
- We report on passively Q-switched operation of a diode-pumped Er-Yb:glass laser with a Co2+:MgAl2O4 plate as a saturable absorber. Optical pulses with peak power exceeding 2 kW and a pulse length of 2.3 ns have been generated. Single-longitudinal-mode Q-switched operation at 1.53 mum has been obtained by use of the Co2+:MgAl2O4 plate as an intracavity etalon. A discussion of the optimal Er3+ concentration as well as optimization of the cavity design is included.
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| 3. |
- Denker, B., et al.
(författare)
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Hot YAG:Yb3+:Er3+ crystal-a potential laser medium for high average power 1.5 μm lasers
- 2006
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Ingår i: Advanced solid-state photonics 2006. - : Optical Society of America. - 1557527989 - 9781557527981
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Konferensbidrag (refereegranskat)abstract
- The near-IR spectroscopic properties of YAG:Yb:Er crystals were investigated at high temperatures. It is shown that at 600°-800°C temperatures they become close to their corresponding properties in Er,Yb: phosphate laser glasses.
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| 4. |
- Denker, Boris, et al.
(författare)
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Luminescent and laser properties of Yb-Er:GdCa4O(BO3)3 : a new crystal for eye-safe 1.5-µm lasers
- 2004
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Ingår i: Applied physics. B, Lasers and optics (Print). - : Springer Science and Business Media LLC. - 0946-2171 .- 1432-0649. ; 79:5, s. 577-581
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Tidskriftsartikel (refereegranskat)abstract
- We present for the first time 1.5-μm laser emission in Yb-Er:GdCa 4O(BO3)3 (GdCOB). The crystals were grown by the Czochralski method from platinum crucibles. Spectroscopic and laser tests of the crystals are described. A continuous-wave output power of 80 mW was achieved in a monolithic microchip cavity under laser-diode pumping.
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| 5. |
- Denker, B., et al.
(författare)
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New crystalline material for 1.5 μm lasers : Yb,Er - Activated GdCa 4O(BO3)3
- 2004
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Ingår i: Advanced Solid-State Photonics. - Washington, D.C. : Optics Info Base, Optical Society of America. - 1557527717 ; , s. 430-434
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Konferensbidrag (refereegranskat)abstract
- A new crystalline medium for 1.5 μm Yb-Er lasers is proposed: GdCa 4O(BO3)3 (GdCOB). Its melting point allows crystal growth using platinum instead of iridium crucibles. Spectroscopic and laser tests of the new material are described. A maximum CW output power of 80 mW was achieved in a monolithic microchip cavity under laser diode pumping.
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| 6. |
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| 8. |
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| 9. |
- Denker, Boris, et al.
(författare)
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Yb3+,Er3+:YAG at high temperatures : energy transfer and spectroscopic properties
- 2007
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Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 271:1, s. 142-147
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Tidskriftsartikel (refereegranskat)abstract
- Energy transfer and spectroscopic properties at high temperatures have been investigated in Er,Yb:YAG crystals. It is shown that at elevated temperatures around 600-800 degrees C these characteristics become similar to those in the efficient 1.5 mu m laser medium - Er,Yb-doped phosphate glasses. (c) 2006 Elsevier B.V. All rights reserved.
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