51 citations · 213 across the 11 of their papers we have counts for
11 papers
Laser-controlled adaptive optic for beam quality enhancement in a multipass thin disk amplifier
Richard Lange, Daniel Kolbe
We devise a laser-controlled adaptive optical element which operates intracavity under high intensity radiation. This element substitutes a conventional mechanically deformable mir…
Rydberg excitation of a single trapped ion
T. Feldker, P. Bachor, M. Stappel +4
We demonstrate excitation of a single trapped cold Ca ion to Rydberg levels by laser radiation in the vacuum-ultraviolet at 122 nm wavelength. Observed resonances are id…
A continuous wave 10 W cryogenic fiber amplifier at 1015 nm and frequency quadrupling to 254 nm
R. Steinborn, A. Koglbauer, P. Bachor +4
A stable, continuous wave, single frequency fiber amplifier system at 1015 nm with 10W output power is presented. It is based on a large mode double clad fiber cooled to liquid nit…
Mode shaping in mixed ion crystals of 40Ca2+ and 40Ca+
T. Feldker, L. Pelzer, M. Stappel +5
We present studies of mixed Coulomb crystals of 40Ca+ and 40Ca2+ ions in a linear Paul trap. Doubly charged ions are produced by photoionisation of trapped 40Ca+ with a vacuum ultr…
Influence of the 6^1S_0-6^3P_1 Resonance on Continuous Lyman-alpha Generation in Mercury
Daniel Kolbe, Martin Scheid, Jochen Walz
Continuous coherent radiation in the vacuum-ultraviolet at 122 nm (Lyman-alpha) can be generated using sum-frequency mixing of three fundamental laser beams in mercury vapour. One…
High power, continuous-wave, single frequency fiber amplifier at 1091 nm and frequency doubling to 545.5 nm
M. Stappel, R. Steinborn, D. Kolbe +1
We present a high power single-frequency ytterbium fiber amplifier system with an output power of 30 W at 1091 nm. The amplifier system consists of two stages, a preamplifier stage…
Triple resonant four-wavemixing boosts the yield of continuous coherent VUV generation
Daniel Kolbe, Martin Scheid, Jochen Walz
Continuous-wave coherent radiation in the vacuum ultraviolet (VUV)wavelength region at 121 nm will be essential for future laser-cooling of trapped antihydrogen [1]. Cold antihydro…
A reliable cw Lyman- laser source for future cooling of antihydrogen
D. Kolbe, A. Beczkowiak, T. Diehl +5
We demonstrate a reliable continuous-wave (cw) laser source at the 1\,--2\, transition in (anti)hydrogen at 121.56\,nm (Lyman-) based on four-wave sum-frequency mixing in…
Rydberg excitation of trapped cold ions: A detailed case study
F. Schmidt-Kaler, T. Feldker, D. Kolbe +5
We provide a detailed theoretical and conceptual study of a planned experiment to excite Rydberg states of ions trapped in a Paul trap. The ultimate goal is to exploit the strong s…
Continuous Lyman-alpha generation by four-wave mixing in mercury for laser-cooling of antihydrogen
D. Kolbe, A. Beczkowiak, T. Diehl +6
Cooling antihydrogen atoms is important for future experiments both to test the fundamental CPT symmetry by high-resolution laser spectroscopy and also to measure the gravitational…
Continuous-wave spontaneous lasing in mercury pumped by resonant two-photon absorption
Daniel Kolbe, Martin Scheid, Andreas Koglbauer +1
The first continuous-wave two-photon absorption laser-induced stimulated emission (CTALISE) is demonstrated. The 7^1S-6^1P transition in mercury at 1014nm wavelength is used and se…