Article
Optics
Stefan Pueschel, Felix Mauerhoff, Christian Kraenkel, Hiroki Tanaka
Summary: This study compares the cooling performance of Yb3+-doped LiYF4 crystals with Yb:KYF crystals grown in our institute using laser cooling by anti-Stokes fluorescence. Yb:KYF exhibits better cooling performance at temperatures below 200K. Further improvement is possible for Yb:KYF crystals through optimizing the growth process and using purer raw materials.
Article
Optics
Stefan Pueschel, Sascha Kalusniak, Christian Kraenkel, Hiroki Tanaka
Summary: By revisiting the spectroscopic characterization of ytterbium-doped LiYF4 (Yb:YLF), it was found that the emission cross sections and radiative lifetimes are temperature-dependent, which can be used for laser cooling application design. Fit equations for important transition peak values as a function of temperature were provided, while the necessary crystal purity for achieving laser cooling was also emphasized based on the spectroscopic data.
Article
Optics
Mikhail Pergament, Martin Kellert, Umit Demirbas, Jelto Thesinga, Simon Reuter, Yizhou Liu, Yi Hua, Muharrem Kilinc, Alexey Yakovlev, Franz X. Kaertner
Summary: In this study, a diode-pumped Yb:YLF laser system is presented, which generates 100-mJ sub-ps pulses at a 1-kHz repetition rate (100 W average power) by chirped-pulse amplification. The laser consists of a cryogenically cooled 78 K, regenerative, eight-pass booster amplifier seeded by an all-fiber front end. The output pulses are compressed to 980 fs in a single-grating Treacy compressor with a throughput of 89%. The laser will be applied to multi-cycle THz generation and pumping of high average power parametric amplifiers.
Article
Optics
Umit Demirbas, Jelto Thesinga, Martin Kellert, Simon Reuter, Mikhail Pergament, Franz X. Kaertner
Summary: We investigated the performance of room-temperature Yb:YLF oscillators with low Yb-doping, achieving high power and wide tuning range by reducing system losses and improving thermal behavior.
Article
Optics
Umit Demirbas, Jelto Thesinga, Martin Kellert, Simon Reuter, Mikhail Pergament, Franz X. Kaertner
Summary: In this study, pulses as short as 40 fs with an average power of 265 mW were generated from a semiconductor saturable absorber mirror (SESAM) mode-locked Yb:YLF oscillator, setting a new record for the shortest pulses and highest power from room-temperature Yb: YLF lasers.
Article
Multidisciplinary Sciences
C. J. Baker, W. Bertsche, A. Capra, C. Carruth, C. L. Cesar, M. Charlton, A. Christensen, R. Collister, A. Cridland Mathad, S. Eriksson, A. Evans, N. Evetts, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, P. Grandemange, P. Granum, J. S. Hangst, W. N. Hardy, M. E. Hayden, D. Hodgkinson, E. Hunter, C. A. Isaac, M. A. Johnson, J. M. Jones, S. A. Jones, S. Jonsell, A. Khramov, P. Knapp, L. Kurchaninov, N. Madsen, D. Maxwell, J. T. K. McKenna, S. Menary, J. M. Michan, T. Momose, P. S. Mullan, J. J. Munich, K. Olchanski, A. Olin, J. Peszka, A. Powell, P. Pusa, C. O. Rasmussen, F. Robicheaux, R. L. Sacramento, M. Sameed, E. Sarid, D. M. Silveira, D. M. Starko, C. So, G. Stutter, T. D. Tharp, A. Thibeault, R. I. Thompson, D. P. van der Werf, J. S. Wurtele
Summary: Laser cooling, a widely-used technique in various fields, has now been successfully applied to anti-hydrogen atoms, leading to significant advancements in antimatter research. By using pulsed, narrow-linewidth laser radiation, researchers were able to Doppler-cool a sample of magnetically trapped anti-hydrogen, demonstrating the ability to manipulate the motion of anti-atoms with laser light and opening up groundbreaking opportunities for future experiments.
Article
Physics, Multidisciplinary
Haowei Xu, Guoqing Wang, Changhao Li, Hua Wang, Hao Tang, Ariel Rebekah Barr, Paola Cappellaro, Ju Li
Summary: The initialization of nuclear spin to its ground state is challenging due to its small energy scale compared with thermal energy, even at cryogenic temperature. In this Letter, an optonuclear quadrupolar effect is proposed, where two-color optical photons can efficiently interact with nuclear spins. Leveraging such an optical interface, nuclear magnons, the collective excitations of nuclear spin ensemble, can be cooled down optically, which could facilitate the application of nuclear spins in quantum information science.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Aleksander Lisiecki, Dawid Slizak
Summary: The study demonstrated the significant effect of introducing nitrogen vapor stream for localized forced cooling during laser deposition on the geometry and hardness of the coatings, with advantages including reduced carbide decomposition and improved carbide distribution uniformity.
Review
Physics, Multidisciplinary
Florian Schreck, Klaasjan van Druten
Summary: Laser cooling is a crucial initial step for achieving Bose-Einstein condensation and quantum degeneracy in atomic gases, bringing them close to absolute zero. Ongoing development in laser cooling methods has enabled more elements to reach quantum degeneracy, leading to new experimental opportunities. Improved techniques like reaching Bose-Einstein condensation purely through laser cooling and continuous condensation are opening up new avenues for creating quantum gases.
Editorial Material
Physics, Multidisciplinary
Rohan D. Glover
Summary: Atom trap trace analysis is a powerful technique for detecting trace radioisotopes of noble gases, with the potential to be extended to other metal isotopes demonstrated by its successful application to a calcium isotope.
Article
Materials Science, Ceramics
Hidetoshi Miyazaki, Shiori Hamada
Summary: Si2N2O films were prepared via pulsed electrophoretic deposition and sintered using laser irradiation. The laser-sintered film showed higher cooling capacity and lower temperature compared to the electrophoretically deposited film. The laser-sintered Si2N2O film with a relative permittivity of 7-8 has the potential for low-k radiative cooling devices. Combining the laser-sintered Si2N2O film with a Peltier element, a device was fabricated that demonstrated the possibility of passive power generation.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Jence T. Mulder, Michael S. Meijer, J. Jasper van Blaaderen, Indy du Fosse, Kellie Jenkinson, Sara Bals, Liberato Manna, Arjan J. Houtepen
Summary: Yb:YLF nanocrystals with an undoped YLF shell can achieve high photoluminescence quantum yield (PLQY) and reduce concentration quenching, making them highly promising for various applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Chaoqun Zhang, Nicholas R. R. Hutzler, Lan Cheng
Summary: A study is reported on the intensity-borrowing mechanisms in laser-coolable polyatomic molecules, which involve non-adiabatic coupling, contributions beyond the Franck-Condon approximation, and Fermi resonances. Non-adiabatic coupling is shown to be necessary for obtaining computational accuracy suitable for laser cooling. The predicted vibronic branching ratios based on non-adiabatic mechanisms agree well with variational calculations, and the effects of electron-correlation and basis-set on transition properties and branching ratios are thoroughly studied. The study identifies RaOH as a promising candidate for laser cooling.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Meteorology & Atmospheric Sciences
T. C. Chakraborty, Xuhui Lee, David M. Lawrence
Summary: Aerosols can enhance terrestrial productivity through global dimming and diffuse radiation fertilization. In regions with a leaf area index greater than 2, the local surface cooling response to aerosols is mainly dominated by the evaporative pathway.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Biochemical Research Methods
Jim Shaw, Yun William Yu
Summary: This study investigates the conservation metric for k-mer selection methods, deriving exact expressions for various methods and demonstrating an increase in mapped reads using a more conserved k-mer selection method. However, the trade-off includes the potential for increased runtime due to the repetitive nature of the selected k-mers. The findings provide insights on using new k-mer selection methods to optimize for speed and alignment quality.
Article
Chemistry, Multidisciplinary
F. Werschler, B. Lindner, C. Hinz, F. Conradt, P. Gumbsheimer, Y. Behovits, C. Negele, T. de Roo, O. Tzang, S. Mecking, A. Leitenstorfer, D. V. Seletskiy
Article
Physics, Multidisciplinary
T. L. M. Guedes, M. Kizmann, D. V. Seletskiy, A. Leitenstorfer, Guido Burkard, A. S. Moskalenko
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
A. Liehl, P. Sulzer, D. Fehrenbacher, T. Rybka, D. Seletskiy, A. Leitenstorfer
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Matthias Kizmann, Thiago Lucena de M. Guedes, Denis Seletskiy, Andrey S. Moskalenko, Alfred Leitenstorfer, Guido Burkard
Article
Instruments & Instrumentation
C. Traum, P. Henzler, S. Lohner, H. Becker, D. Nabben, P. Gumbsheimer, C. Hinz, J. F. Lippmann, S. Mahapatra, K. Brunner, D. V. Seletskiy, A. Leitenstorfer
REVIEW OF SCIENTIFIC INSTRUMENTS
(2019)
Article
Optics
Philipp Sulzer, Cornelius Beckh, Andreas Liehl, Jeldrik Huster, Kilian R. Keller, Moritz Cimander, Philipp Henzler, Christian Traum, Claudius Riek, Denis Seletskiy, Alfred Leitenstorfer
Article
Physics, Applied
Pascal Gumbsheimer, Frieder Conradt, Yannic Behovits, Steffen Huber, Christopher Hinz, Carla Negele, Stefan Mecking, Denis Seletskiy, Alfred Leitenstorfer
Summary: The robust algorithm based on cross-correlations and lucky imaging can reliably correct spectrally diffused datasets, enabling detailed analysis of semiconductor quantum dots' emission fine structure. It allows for resolving bright and dark excitonic transitions with optimum signal-to-noise ratio and precise determination of linear polarization angles, providing a tool for accurate computation of the azimuth and polar angle of the QDs. This method offers a non-invasive and precise characterization of QD fine structure and orientation, valuable for efficient coupling of quantum emitters to the electromagnetic field using nano- and micro-optic strategies.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
P. Henzler, C. Traum, M. Holtkemper, D. Nabben, M. Erbe, D. E. Reiter, T. Kuhn, S. Mahapatra, K. Brunner, D. Seletskiy, A. Leitenstorfer
Summary: The study examines ultrafast transmission changes around the fundamental trion resonance in a negatively charged II-VI quantum dot after exciting a p-shell exciton. The biexcitonic induced absorption reveals quantum beats between hot-trion states at 133 GHz. The relaxation of the P-shell hole within 390 fs dominates interband dephasing, while trionic coherence remains stored in the spin system for 85 ps due to Pauli blocking of the triplet electron.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jyothis Thomas, Lauro J. Q. Maia, Kummara Venkata Krishnaiah, Yannick Ledemi, Jean-Sebastien Boisvert, Antsar Hlil, Denis Seletskiy, Younes Messaddeq, Raman Kashyap
Summary: The study investigated the potential of oxyfluoride glass-ceramics with different rare earth ion concentrations for optical refrigeration applications, finding that the highest intensity of anti-Stokes emission occurred in samples containing 1.5 mol % or 2.0 mol % Yb3+.
JOURNAL OF LUMINESCENCE
(2021)
Article
Physics, Multidisciplinary
Stephane Virally, Patrick Cusson, Denis V. Seletskiy
Summary: By using bright photon-number entangled twin beams for quantum-enhanced EOS, it is possible to improve the signal-to-noise ratio in the case of quantum vacuum and extract higher-order moments of the quantum noise distribution. These improvements pave the way for robust tomography of quantum fields in space-time.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
P. Sulzer, K. Oguchi, J. Huster, M. Kizmann, T. L. M. Guedes, A. Liehl, C. Beckh, A. S. Moskalenko, G. Burkard, D. Seletskiy, A. Leitenstorfer
Article
Optics
A. Liehl, P. Sulzer, D. Fehrenbacher, S. Eggert, M. Ludwig, F. Ritzkowsky, D. Seletskiy, A. Leitenstorfer
Proceedings Paper
Engineering, Electrical & Electronic
Andreas Liehl, Philipp Sulzer, David Fehrenbacher, Denis V. Seletskiy, Alfred Leitenstorfer
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Jan F. Lippmann, Alfred Leitenstorfer, Denis V. Seletskiy
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Article
Materials Science, Multidisciplinary
C. Hinz, P. Gumbsheimer, C. Traum, M. Holtkemper, B. Bauer, J. Haase, S. Mahapatra, A. Frey, K. Brunner, D. E. Reiter, T. Kuhn, D. V. Seletskiy, A. Leitenstorfer
