A5018926679- Advanced Frequency and Time Standards
- Semiconductor Lasers and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Spectroscopy and Laser Applications
- Solid State Laser Technologies
- Quantum Mechanics and Applications
- Semiconductor Quantum Structures and Devices
- Geophysics and Sensor Technology
- Pulsars and Gravitational Waves Research
- Mechanical and Optical Resonators
- Magneto-Optical Properties and Applications
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Advancements in PLL and VCO Technologies
- Geophysics and Gravity Measurements
- Laser-Matter Interactions and Applications
- Ocular and Laser Science Research
- Photorefractive and Nonlinear Optics
- Optical Network Technologies
- Quantum, superfluid, helium dynamics
Ferdinand-Braun-Institut
2015-2024
Kirchhoff (Germany)
2018-2023
Humboldt-Universität zu Berlin
2009-2019
Humboldt State University
2011-2012
Atom interferometers covering macroscopic domains of space-time are a spectacular manifestation the wave nature matter. Because their unique coherence properties, Bose-Einstein condensates ideal sources for an atom interferometer in extended free fall. In this Letter we report on realization asymmetric Mach-Zehnder operated with condensate microgravity. The resulting interference pattern is similar to one far field double slit and shows linear scaling time packets expand. We employ...
Albert Einstein's insight that it is impossible to distinguish a local experiment in "freely falling elevator" from one free space led the development of theory general relativity. The wave nature matter manifests itself striking way Bose-Einstein condensates, where millions atoms lose their identity and can be described by single macroscopic function. We combine these two topics report preparation observation condensate during fall 146-meter-tall evacuated drop tower. During expansion over...
Precision time references in space are of major importance to satellite-based fundamental science, global satellite navigation, earth observation, and formation flying.Here we report on the operation a compact, rugged, automated optical frequency comb setup sounding rocket under microgravity.The experiment compared two clocks, one based D 2 transition Rb, another hyperfine splitting Cs.This represents first clock space, which is an important milestone for future precision metrology.Based...
We present a simple method to accurately measure the frequency noise power spectrum of lasers. It relies on creating beat note between two lasers, capturing corresponding signal in time domain, and appropriately postprocessing data derive spectrum. In contrast methods already established, it does not require stabilization laser an optical reference, i.e., second laser, cavity or atomic transition. further omits discriminator hence avoids bandwidth limitation nonlinearity effects common...
We present a micro-integrated, extended cavity diode laser module for space-based experiments on potassium Bose-Einstein condensates and atom interferometry. The emits at the wavelength of D2-line 766.7 nm provides 27.5 GHz continuous tunability. It features sub-100 kHz short term (100 μs) emission linewidth. To qualify quantum optics in space, vibration tests (8.1 g(RMS) 21.4 g(RMS)) mechanical shock (1500 g) were carried out. No degradation electro-optical performance was observed.
We have developed, assembled, and flight-proven a stable, compact, autonomous extended cavity diode laser (ECDL) system designed for atomic physics experiments in space. To that end, two micro-integrated ECDLs at 766.7 nm were frequency stabilized during sounding rocket flight by means of modulation spectroscopy (FMS) 39^K offset locking techniques based on the beat note ECDLs. The stabilization as well additional hard- software to test hot redundancy mechanisms implemented part...
We report on the realization of narrow linewidth high power DFB diode lasers emitting near 1064 nm in stable longitudinal and lateral single mode. The is analyzed dependence output for with cavity lengths 1 2 mm by means a heterodyne beat note technique. minimum intrinsic 22 kHz FWHM (full width at half maximum, 100 μ s time scale) an 150 mW length mm. total mainly determined technical noise corresponds to 234 70 mW. influence current investigated compared different lengths. Re-broadening...
We present micro-integrated diode laser modules operating at wavelengths of 767 and 780 nm for cold quantum gas experiments on potassium rubidium. The master-oscillator-power-amplifier concept provides both narrow linewidth emission high optical output power. With a (10 μs) below 1 MHz an power up to 3 W, these are specifically suited optics feature the robustness required operation drop tower or on-board sounding rocket. This technology development hence paves way toward precision in space.
We present the status of our efforts to develop very compact and robust diode laser modules specifically suited for quantum optics experiments in field space. The paper describes why hybrid micro-integration GaAs-diode technology is best meet needs such applications. electro-optical performance achieved with micro-integrated, medium linewidth, high power distributed-feedback master-oscillator-power-amplifier power, narrow linewidth extended cavity lasers emitting at 767 nm 780 are briefly...
Compact laser sources with long coherence lengths in the visible spectral region are sought for many applications. This letter presents distributed-Bragg-reflector (DBR) ridge-waveguide (RW) lasers an emission wavelength at 633 nm and optical output power >20 mW. The DBR-RW exhibit a technical linewidth full width half maximum of ~1 MHz. line can be tuned via current temperature >200 GHz. At 14 mW, show preliminary lifetime 4000 h.
We demonstrate a compact, narrow-linewidth, high-power, micro-integrated semiconductor-based master oscillator power amplifier laser module which is implemented on footprint of 50 x 10 mm(2). A micro-isolator between the and suppresses optical feedback. The distributed Bragg reflector optimized for narrow-linewidth operation consists ridge waveguide entry tapered section. features stable single-mode with FWHM linewidth only 100 kHz an intrinsic as small 3.6 output beyond 1 W.
Space-borne optical frequency references based on spectroscopy of atomic vapors may serve as an integral part compact clocks, which can advance global navigation systems, or be utilized for earth observation missions laser systems cold atom gradiometers. Nanosatellites offer low launch-costs, multiple deployment opportunities and short payload development cycles, enabling rapid maturation underlying key technologies in space. Towards in-orbit demonstration such a platform, we have developed...
We determine Faraday rotations and measure the optical reflection transmission from magneto-optical Cd1−xMnxTe crystals with various stoichiometric ratios. For wavelengths between 675 1025 nm, we derive Verdet constants, loss coefficients, complex indices of that are relevant measures to find suitable ratios for realization miniaturized isolators. By measurements, several different discuss observed dependence properties on ratio respect their use in Finally, show figure merit, i.e.,...
We present our next-generation micro-integrated diode laser modules. Based on the ECDL-MOPA concept, modules allow independent tuning of emission frequency and output power. They currently operate at 689, 767, 780 794 nm, but can also be adapted for other wavelengths. The achieve mode-hop-free even beyond free spectral range laser. Additionally, we realized a Bragg grating based reference using same technology. It demonstrates high stability wide range. Currently, expand application...
Semiconductor laser technology has shown to be a promising alternative other technologies, e.g. solid state lasers, for employment in coherent satellite communication and fundamental physics applications. Being compact, robust, energy- cost-efficient these semiconductor lasers fulfill the key mandatory requirements deployment space. At Ferdinand-Braun-Institut, we have developed versatile platform integration of any two chips, they active (e.g. laser, amplifier) or passive phase modulator),...
Within the European Space Agency (ESA) activity "Gravitational Wave Observatory Metrology Laser" we designed a laser head to fulfill LISA requirements using non-NPRO seed technology: an external cavity diode (ECDL) with resonant optical feedback from as master oscillator for further linewidth narrowing. Furthermore, our design features single-stage fiber amplifier amplification factor of about 20 dB. This paper covers on source LISA, and first results performance characterization breadboard.
We have realized a laser platform based on GaAs diode lasers that allows for an operation in mobile exper-imental setups harsh environments, such as sounding rockets. The comes two versions: master-oscillator-power-amplifier and extended cavity laser. Our very robust micro-optical bench has footprint of 80 x 25 mm<sup>2</sup>. It strictly omits any movable parts. Master-oscillator-power-amplifier systems distributed feedback master oscillators 767 nm 780 narrow linewidth emission been...