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1. A Prototype of a Compact Rubidium-Based Optical Frequency Reference for Operation on Nanosatellites

Author

Strangfeld, Aaron, Kanthak, Simon, Schiemangk, Max, Wiegand, Benjamin, Wicht, Andreas, Ling, Alexander, and Krutzik, Markus

Subjects
Physics - Atomic Physics, Physics - Instrumentation and Detectors
Abstract

Space-borne optical frequency references based on spectroscopy of atomic vapors may serve as an integral part of compact optical atomic clocks, which can advance global navigation systems, or can be utilized for earth observation missions as part of laser systems for cold atom gradiometers. Nanosatellites offer low launch-costs, multiple deployment opportunities and short payload development cycles, enabling rapid maturation of optical frequency references and underlying key technologies in space. Towards an in-orbit demonstration on such a platform, we have developed a CubeSat-compatible prototype of an optical frequency reference based on the D2-transition in rubidium. A frequency instability of 1.7e-12 at 1 s averaging time is achieved. The optical module occupies a volume of 35 cm^3, weighs 73 g and consumes 780 mW of power.

Published
2021
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2. Micro-integrated diode laser modules for operation in quantum technology applications

Author

Hirsch, Janpeter, primary, Bursy, Marcel, additional, Gärtner, Martin, additional, Gerken, Stephanie, additional, Goossen-Schmidt, Nora, additional, Hamperl, Jonas, additional, Hariharan, Sriram, additional, Kubitza, Simon, additional, Müller, Norbert, additional, Müller, Mathis, additional, Schiemangk, Max, additional, Tyborski, Christoph, additional, Zou, Dian, additional, and Wicht, Andreas, additional

Published
2024
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3. Miniaturized lab system for future cold atom experiments in microgravity

Author

Kulas, Sascha, Vogt, Christian, Resch, Andreas, Hartwig, Jonas, Ganske, Sven, Matthias, Jonas, Schlippert, Dennis, Wendrich, Thijs, Ertmer, Wolfgang, Rasel, Ernst Maria, Damjanic, Marcin, Weßels, Peter, Kohfeldt, Anja, Luvsandamdin, Erdenetsetseg, Schiemangk, Max, Grzeschik, Christoph, Krutzik, Markus, Wicht, Andreas, Peters, Achim, Herrmann, Sven, and Lämmerzahl, Claus

Subjects
Physics - Atomic Physics, General Relativity and Quantum Cosmology
Abstract

We present the technical realization of a compact system for performing experiments with cold $^{87}{\text{Rb}}$ and $^{39}{\text{K}}$ atoms in microgravity in the future. The whole system fits into a capsule to be used in the drop tower Bremen. One of the advantages of a microgravity environment is long time evolution of atomic clouds which yields higher sensitivities in atom interferometer measurements. We give a full description of the system containing an experimental chamber with ultra-high vacuum conditions, miniaturized laser systems, a high-power thulium-doped fiber laser, the electronics and the power management. In a two-stage magneto-optical trap atoms should be cooled to the low $\mu$K regime. The thulium-doped fiber laser will create an optical dipole trap which will allow further cooling to sub-$\mu$K temperatures. The presented system fulfills the demanding requirements on size and power management for cold atom experiments on a microgravity platform, especially with respect to the use of an optical dipole trap. A first test in microgravity, including the creation of a cold Rb ensemble, shows the functionality of the system.

Published
2016
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4. Autonomous frequency stabilization of two extended cavity diode lasers at the potassium wavelength on a sounding rocket

Author

Dinkelaker, Aline N., Schiemangk, Max, Schkolnik, Vladimir, Kenyon, Andrew, Lampmann, Kai, Wenzlawski, André, Windpassinger, Patrick, Hellmig, Ortwin, Wendrich, Thijs, Rasel, Ernst M., Giunta, Michele, Deutsch, Christian, Kürbis, Christian, Smol, Robert, Wicht, Andreas, Krutzik, Markus, and Peters, Achim

Subjects
Physics - Atomic Physics, Physics - Instrumentation and Detectors
Abstract

We have developed, assembled, and flight-proven a stable, compact, and 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 a sounding rocket flight by means of frequency modulation spectroscopy (FMS) of 39^K and offset locking techniques based on the beat note of the two ECDLs. The frequency stabilization as well as additional hard- and software to test hot redundancy mechanisms were implemented as part of a state-machine, which controlled the experiment completely autonomously throughout the entire flight mission., Comment: 10 pages, 7 figures

Published
2016
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7. Extensive study of magneto-optical and optical properties of Cd1−xMnxTe between 675 and 1025 nm

Author

Tyborski, Christoph, Hassan, Muhammad T., Flisgen, Thomas, Schiemangk, Max, and Wicht, Andreas

Subjects
Complex indices, Verdet constant, Reflection and transmission, Stoichiometric ratio, Loss coefficients, Optical reflection, Magneto-optical, Transmission measurements, Optical isolators, Reflection measurements
Abstract

We determine Faraday rotations and measure the optical reflection and transmission from magneto-optical Cd1−xMnxTe crystals with various stoichiometric ratios. For wavelengths between 675 and 1025 nm, we derive Verdet constants, optical loss coefficients, and the complex indices of reflection that are relevant measures to find suitable stoichiometric ratios of Cd1−xMnxTe for the realization of miniaturized optical isolators. By reflection and transmission measurements, we determine the stoichiometric ratios of several different Cd1−xMnxTe crystals and discuss the observed dependence of the optical properties on the stoichiometric ratio with respect to their use in optical isolators. Finally, we show the relevant figure of merit, i.e., the ratio of Verdet constants and optical loss coefficients for Cd1−xMnxTe crystals with Mn contents ranging from x = 0.14 to x = 0.50.

Published
2023
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9. Miniaturized Lab System for Future Cold Atom Experiments in Microgravity

Author

Kulas, Sascha, Vogt, Christian, Resch, Andreas, Hartwig, Jonas, Ganske, Sven, Matthias, Jonas, Schlippert, Dennis, Wendrich, Thijs, Ertmer, Wolfgang, Maria Rasel, Ernst, Damjanic, Marcin, Weßels, Peter, Kohfeldt, Anja, Luvsandamdin, Erdenetsetseg, Schiemangk, Max, Grzeschik, Christoph, Krutzik, Markus, Wicht, Andreas, Peters, Achim, Herrmann, Sven, and Lämmerzahl, Claus

Published
2017
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11. Extensive study of magneto-optical and optical properties of Cd1−xMnxTe between 675 and 1025 nm.

Author

Tyborski, Christoph, Hassan, Muhammad T., Flisgen, Thomas, Schiemangk, Max, and Wicht, Andreas

Subjects
OPTICAL properties, LIGHT transmission, OPTICAL constants, FARADAY effect, MAGNETOOPTICS, OPTICAL reflection, OPTICAL losses
Abstract

We determine Faraday rotations and measure the optical reflection and transmission from magneto-optical Cd1−xMnxTe crystals with various stoichiometric ratios. For wavelengths between 675 and 1025 nm, we derive Verdet constants, optical loss coefficients, and the complex indices of reflection that are relevant measures to find suitable stoichiometric ratios of Cd1−xMnxTe for the realization of miniaturized optical isolators. By reflection and transmission measurements, we determine the stoichiometric ratios of several different Cd1−xMnxTe crystals and discuss the observed dependence of the optical properties on the stoichiometric ratio with respect to their use in optical isolators. Finally, we show the relevant figure of merit, i.e., the ratio of Verdet constants and optical loss coefficients for Cd1−xMnxTe crystals with Mn contents ranging from x = 0.14 to x = 0.50. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Distributed Bragg Reflector Lasers at 689.45 nm for Sr Spectroscopy

Author

Goossen-Schmidt, Nora, primary, Pyrlik, Christoph, additional, Hassan, Muhammad Tehwar, additional, Bawamia, Ahmad, additional, Fricke, Jörg, additional, Knigge, Andrea, additional, Maaßdorf, Andre, additional, Schiemangk, Max, additional, Wenzel, Hans, additional, and Wicht, Andreas, additional

Published
2022
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15. Degenerate Quantum Gases in Microgravity

Author

Rudolph, Jan, Gaaloul, Naceur, Singh, Yeshpal, Ahlers, Holger, Herr, Waldemar, Schulze, Torben A., Seidel, Stephan Tobias, Rode, Christina, Schkolnik, Vladimir, Ertmer, Wolfgang, Rasel, Ernst Maria, Müntinga, Hauke, Könemann, Thorben, Resch, Andreas, Herrmann, Sven, Lämmerzahl, Claus, Zoest, Tim van, Dittus, Hansjörg, Vogel, Anika, Wenzlawski, André, Sengstock, Klaus, Meyer, Nadine, Bongs, Kai, Krutzik, Markus, Lewoczko-Adamczyk, Wojciech, Schiemangk, Max, Peters, Achim, Eckart, Michael, Kajari, Endre, Arnold, Stefan, Nandi, Gerrit, Schleich, Wolfgang P., Walser, Reinhold, Steinmetz, Tilo, Hänsch, Theodor W., and Reichel, Jakob

Published
2011
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16. Thermoacoustic optical path length stabilization in a single-mode optical fiber

Author

Lewoczko-Adamczyk, Wojciech, Schiemangk, Max, Muller, Holger, and Peters, Achim

Subjects
Fiber optics -- Research, Fibers -- Thermal properties, Fibers -- Optical properties, Fibers -- Acoustic properties, Refractive index -- Research, Sound -- Speed, Sound -- Observations, Fiber optics, Astronomy, Physics
Abstract

We present a simple technique to actively stabilize the optical path length in an optical fiber. A part of the fiber is coated with a thin, electrically conductive layer, which acts as a heater. The optical path length is thus modified by temperature-dependent changes in the refractive index and the mechanical length of the fiber. For the first time, we measure the dynamic response of the optical path length to the periodic changes of temperature and find it to be in agreement with our former theoretical prediction. The fiber's response to the temperature changes is determined by the speed of sound in quartz rather than by slow thermal diffusion. Making use of this fact, we succeeded in actively stabilizing the optical path length with a closed-loop bandwidth of 3.8 kHz. OCIS codes: 060.4080, 060.2270.

Published
2009

17. Ein Lasersystem für Experimente mit Quantengasen unter Schwerelosigkeit

Author

Schiemangk, Max, Görlitz, Axel, Tränkle, Günther, and Peters, Achim

Subjects
frequency noise measurement, Mikrogravitation, Halbleiterlaser, semiconductor lasers, 530 Physik, microgravity, drop tower, Fallturm, UH 5616, diode laser system, ddc:530, laser modules, Lasermodule, Diodenlasersystem, Frequenzrauschmessung
Abstract

Bereits Galilei untersuchte, ob verschiedene frei fallende Körper im Schwerefeld der Erde gleich stark beschleunigt werden, die sogenannte Universalität des freien Falls. Die Genauigkeit der experimentellen Überprüfungen konnte seitdem beständig gesteigert werden. Einen neuen Ansatz, die Messgenauigkeit noch weiter zu verbessern, bilden quantenmechanische Messmethoden, die auf Materiewelleninterferometrie beruhen. Die dabei genutzten Apparaturen verwenden Laserstrahlung zur Kühlung, Manipulation und Detektion der Atome. Ziel der vorliegenden Arbeit war die Entwicklung des Lasersystems für ein neues Experiment, das erstmals Zwei-Spezies-Atominterferometrie (mit Rb & K) in Mikrogravitation demonstrieren soll. Ein Lasersystem, das sowohl die funktionalen Anforderungen als auch die aus dem Einsatz auf dem Katapult des Fallturms resultierenden Anforderung (Volumen < 44 l, Masse < 35 kg und voll funktionsfähig sofort nach einem Katapultstart mit Beschleunigungen von 30 g) erfüllt, wurde funktional konzipiert und mechanisch designt. Zur Demonstration wurde der Rubidium-Teil des Lasersystems funktional sowie mechanisch qualifiziert. Inzwischen wird er routinemäßig für Experimente am Fallturm eingesetzt. Für das Lasersystem wurden kompakte und robuste schmalbandigen Lasermodule entwickelt. Diese liefern bei einer Grundfläche der optischen Bank von nur 10 mm x 50 mm Ausgangsleistungen von bis zu 3,7 W. Am Arbeitspunkt (1 W Ausgangsleistung) besitzen die Strahlquellen Linienbreiten im Bereich von 100 kHz (Lorentz) bzw. 1 MHz (-3 dB, 10 µs). Zum Nachweis der spektralen Stabilität der Lasermodule wurde ein Messverfahrens zur Charakterisierung des Frequenzrauschens freilaufender Laser entwickelt. Dieses basiert auf einer Schwebungsmessung mit anschließender Analyse der Quadraturkomponenten des Signals im Zeitbereich. Durch den Einsatz geeigneter Filter erlaubt es die Unterdrückung der für Diodenlaser typischen Frequenzdrifts. Galileo, already, investigated whether different free falling bodies in the gravitational field of the Earth are accelerated at the same rate, the so-called universality of the free fall. The accuracy of the experimental tests has been steadily increased ever since. A new approach to further increase the measurement accuracy is provided by quantum mechanical measurements based on matter wave interferometry. The apparatuses used for this purpose employ laser radiation for cooling, manipulation, and detection of the atoms. The aim of this thesis’ work was the development of the laser system for a new experiment intended to demonstrate two-species atom interferometry (utilizing Rb & K) in microgravity for the first time. A laser system, which fulfills the functional requirements as well as the requirements resulting from the deployment on the catapult of the drop tower (volume < 44 l, mass < 35 kg, and fully functional immediately after a catapult launch with accelerations of 30 g), has been functionally conceived and mechanically designed. For demonstration, the rubidium part of the laser system was functionally and mechanically qualified. By now, it is routinely used for experiments at the drop tower. For the laser system, compact and robust spectrally narrow laser modules have been developed. These provide an output power up to 3.7 W at a footprint of the optical bench of only 10 mm × 50 mm. At the operating point (1 W output power), the radiation sources exhibit linewidths in the range of 100 kHz (Lorentzian) and 1 MHz (−3 dB, 10 μs). To validate the spectral stability of the laser modules a measuring method for the characterization of the frequency noise of free-running lasers has been developed. This method is based on a beat note measurement with subsequent analysis of the quadrature components of the signal in the time domain. By utilizing appropriate filters, it allows for the suppression of the frequency drifts that are typical for diode lasers.

Published
2019

18. Ein Lasersystem für Experimente mit Quantengasen unter Schwerelosigkeit

Author

Schiemangk, Max and Schiemangk, Max

Abstract

Bereits Galilei untersuchte, ob verschiedene frei fallende Körper im Schwerefeld der Erde gleich stark beschleunigt werden. Diese sogenannte Universalität des freien Falls wurde seither immer präziser experimentell untersucht. Quantenmechanische Messmethoden, die auf Materiewelleninterferometrie beruhen, bieten einen neuen Ansatz, die Messgenauigkeit noch weiter zu verbessern. Im Rahmen dieser Arbeit wurde ein Lasersystem für ein neues Experiment entwickelt, das erstmals Zwei-Spezies-Atominterferometrie in Mikrogravitation demonstrieren soll. Dieses Lasersystem wurde so konzipiert und mechanisch designt, dass es die funktionalen Anforderungen erfüllt und auf dem Katapult des Bremer Fallturms eingesetzt werden kann – mit den folgenden Spezifikationen: Volumen < 44 l; Masse < 35 kg; sofort voll funktionsfähig nach Beschleunigungen von 30 g. Der in der Arbeit funktional sowie mechanisch qualifizierte Teil des Lasersystems wird inzwischen routinemäßig am Fallturm eingesetzt. Dafür wurden kompakte und robuste schmalbandige Diodenlasermodule entwickelt, die Ausgangsleistungen von bis zu 3,7 W auf einer Grundfläche der optischen Bank von nur 10 mm x 50 mm liefern. Am Arbeitspunkt von1 W besitzen die Strahlquellen Linienbreiten im Bereich von 100 kHz (Lorentz) bzw. 1 MHz (-3 dB, 10 µs). Um die spektrale Stabilität der Lasermodule nachzuweisen, wurde ein spezielles Messverfahren zur Charakterisierung des Frequenzrauschens freilaufender Laser entwickelt. Diese Entwicklungen tragen entscheidend dazu bei, ein Zwei-Spezies-Atominterferometer in Mikrogravitation zu demonstrieren – und sind damit einer der wichtigen Schritte auf dem Weg zu einem Test der Universalität des freien Falls mit Quantengasen unter Schwerelosigkeit.

Published
2020

19. A new laser technology for LISA

Author

Dahl, Katrin, primary, Cebeci, Pelin, additional, Fitzau, Oliver, additional, Giesberts, Martin, additional, Greve, Christian, additional, Krutzik, Markus, additional, Peters, Achim, additional, Amairi Pyka, Sana, additional, Sanjuan, Jose, additional, Schiemangk, Max, additional, Schuldt, Thilo, additional, Voss, Kai, additional, and Wicht, Andreas, additional

Published
2019
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21. Highly stable fiber lasers for satellite-based gravitational measurement

Author

Fitzau, Oliver, primary, Betz, Patricia, additional, Cebeci, Pelin, additional, Giesberts, Martin, additional, Hoffmann, Hans-Dieter, additional, Schiemangk, Max, additional, Wicht, Andreas, additional, Sanjuan, Josep, additional, Dahl, Katrin, additional, Pyka, Sana, additional, Kovalchuk, Evgeny, additional, and Peters, Achim, additional

Published
2019
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23. Space based lasers for gravitational wave detection

Author

Greve, Christian, primary, Dahl, Katrin, additional, Barwood, Geoffrey, additional, Bennès, Jonathan, additional, Braxmaier, Claus, additional, Cebeci, Pelin, additional, Deutsch, Christoph, additional, Fitzau, Oliver, additional, Ghulinyan, Mher, additional, Giesberts, Martin, additional, Gill, Patrick, additional, Kassner, Brigitte, additional, Koller, Silvio, additional, Kovalchuk, Evgeny, additional, Krutzik, Markus, additional, Kundermann, Stefan, additional, Lecomte, Steve, additional, Le Goff, Roland, additional, Meier, Christophe, additional, Oswald, Markus, additional, Peters, Achim, additional, Pyka, Sana Amairi, additional, Sanjuan, Jose, additional, Schiemangk, Max, additional, Schilt, Stéphane, additional, Schuldt, Thilo, additional, Sell, Alexander, additional, Stenzel, Christian, additional, Voss, Kai, additional, Wicht, Andreas, additional, and Zhukov, Anton, additional

Published
2019
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25. A New Laser Technology for LISA.

Author

Dahl, Katrin, Cebeci, Pelin, Fitzau, Oliver, Giesberts, Martin, Greve, Christian, Krutzik, Markus, Peters, Achim, Pyka, Sana Amairi, Sanjuan, Jose, Schiemangk, Max, Schuldt, Thilo, Voss, Kai, and Wicht, Andreas

Published
2019
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28. Autonomous frequency stabilization of two extended-cavity diode lasers at the potassium wavelength on a sounding rocket

Author

Dinkelaker, Aline N., primary, Schiemangk, Max, additional, Schkolnik, Vladimir, additional, Kenyon, Andrew, additional, Lampmann, Kai, additional, Wenzlawski, André, additional, Windpassinger, Patrick, additional, Hellmig, Ortwin, additional, Wendrich, Thijs, additional, Rasel, Ernst M., additional, Giunta, Michele, additional, Deutsch, Christian, additional, Kürbis, Christian, additional, Smol, Robert, additional, Wicht, Andreas, additional, Krutzik, Markus, additional, and Peters, Achim, additional

Published
2017
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30. Space-borne frequency comb metrology

Author

Lezius, Matthias, primary, Wilken, Tobias, additional, Deutsch, Christian, additional, Giunta, Michele, additional, Mandel, Olaf, additional, Thaller, Andy, additional, Schkolnik, Vladimir, additional, Schiemangk, Max, additional, Dinkelaker, Aline, additional, Kohfeldt, Anja, additional, Wicht, Andreas, additional, Krutzik, Markus, additional, Peters, Achim, additional, Hellmig, Ortwin, additional, Duncker, Hannes, additional, Sengstock, Klaus, additional, Windpassinger, Patrick, additional, Lampmann, Kai, additional, Hülsing, Thomas, additional, Hänsch, Theodor W., additional, and Holzwarth, Ronald, additional

Published
2016
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31. Miniaturized Lab System for Future Cold Atom Experiments in Microgravity

Author

Kulas, Sascha, primary, Vogt, Christian, additional, Resch, Andreas, additional, Hartwig, Jonas, additional, Ganske, Sven, additional, Matthias, Jonas, additional, Schlippert, Dennis, additional, Wendrich, Thijs, additional, Ertmer, Wolfgang, additional, Maria Rasel, Ernst, additional, Damjanic, Marcin, additional, Weßels, Peter, additional, Kohfeldt, Anja, additional, Luvsandamdin, Erdenetsetseg, additional, Schiemangk, Max, additional, Grzeschik, Christoph, additional, Krutzik, Markus, additional, Wicht, Andreas, additional, Peters, Achim, additional, Herrmann, Sven, additional, and Lämmerzahl, Claus, additional

Published
2016
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33. A new laser technology for LISA

Author

Sodnik, Zoran, Karafolas, Nikos, Cugny, Bruno, Dahl, Katrin, Cebeci, Pelin, Fitzau, Oliver, Giesberts, Martin, Greve, Christian, Krutzik, Markus, Peters, Achim, Amairi Pyka, Sana, Sanjuan, Jose, Schiemangk, Max, Schuldt, Thilo, Voss, Kai, and Wicht, Andreas

Published
2019
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35. High-power, micro-integrated diode laser modules at 767 and 780 nm for portable quantum gas experiments

Author

Schiemangk, Max, primary, Lampmann, Kai, additional, Dinkelaker, Aline, additional, Kohfeldt, Anja, additional, Krutzik, Markus, additional, Kürbis, Christian, additional, Sahm, Alexander, additional, Spießberger, Stefan, additional, Wicht, Andreas, additional, Erbert, Götz, additional, Tränkle, Günther, additional, and Peters, Achim, additional

Published
2015
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44. Degenerate Quantum Gases in Microgravity

Author

Rudolph, Jan, primary, Gaaloul, Naceur, additional, Singh, Yeshpal, additional, Ahlers, Holger, additional, Herr, Waldemar, additional, Schulze, Torben A., additional, Seidel, Stephan Tobias, additional, Rode, Christina, additional, Schkolnik, Vladimir, additional, Ertmer, Wolfgang, additional, Rasel, Ernst Maria, additional, Müntinga, Hauke, additional, Könemann, Thorben, additional, Resch, Andreas, additional, Herrmann, Sven, additional, Lämmerzahl, Claus, additional, Zoest, Tim van, additional, Dittus, Hansjörg, additional, Vogel, Anika, additional, Wenzlawski, André, additional, Sengstock, Klaus, additional, Meyer, Nadine, additional, Bongs, Kai, additional, Krutzik, Markus, additional, Lewoczko-Adamczyk, Wojciech, additional, Schiemangk, Max, additional, Peters, Achim, additional, Eckart, Michael, additional, Kajari, Endre, additional, Arnold, Stefan, additional, Nandi, Gerrit, additional, Schleich, Wolfgang P., additional, Walser, Reinhold, additional, Steinmetz, Tilo, additional, Hänsch, Theodor W., additional, and Reichel, Jakob, additional

Published
2010
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47. Realization of a magneto-optical trap in microgravity

Author

Bongs, Kai, primary, Brinkmann, Wiebke, additional, Dittus, Hansjörg, additional, Ertmer, Wolfgang, additional, Göklü, Ertan, additional, Johannsen, Greta, additional, Kajari, Endre, additional, Könemann, Thorben, additional, Lämmerzahl, Claus, additional, Lewoczko-Adamczyk, Wojciech, additional, Nandi, Gerrit, additional, Peters, Achim, additional, Rasel, Ernst Maria, additional, Schleich, Wolfgang P., additional, Schiemangk, Max, additional, Sengstock, Klaus, additional, Vogel, Anika, additional, Walser, Reinhold, additional, Wildfang, Sven, additional, and Zoest, Tim Van, additional

Published
2007
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49. Narrow Linewidth DFB Lasers Emitting Near a Wavelength of 1064 nm.

Author

Spiebberger, Stefan, Schiemangk, Max, Wicht, Andreas, Wenzel, Hans, Brox, Olaf, and Erbert, Götz

Abstract

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 linewidth is analyzed in dependence of the output power for lasers with cavity lengths of 1 and 2 mm by means of a heterodyne beat note technique. The minimum intrinsic linewidth is 22 kHz FWHM (full width at half maximum, at 100 \mus time scale) for an output power of 150 mW and a cavity length of 2 mm. The minimum total linewidth is mainly determined by technical noise and corresponds to 234 kHz FWHM at an output power of 70 mW. The influence of current noise on the linewidth is investigated and compared for different cavity lengths. Re-broadening at high output power is only observed for the contribution of technical noise to the linewidth. The intrinsic linewidth shows the theoretically expected 1/Pout-dependence at all power levels. [ABSTRACT FROM PUBLISHER]

Published
2010
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50. Realization of a magneto-optical trap in microgravity.

Author

Kai Bongs, Brinkmann, Wiebke, Dittus, Hansjörg, Ertmer, Wolfgang, Göklü, Ertan, Johannsen, Greta, Kajari, Endre, Könemann, Thorben, Lämmerzahl, Claus, Lewoczko-Adamczyk, Wojciech, Nandi, Gerrit, Peters, Achim, Rasel, Ernst Maria, Schleich, Wolfgang P., Schiemangk, Max, Sengstock, Klaus, Vogel, Anika, Walser, Reinhold, Wildfang, Sven, and Van Zoest, Tim

Subjects
MAGNETOOPTICS, REDUCED gravity environments, ATOMS, COOLING, LASERS, QUANTUM theory
Abstract

We report on the first realization of magneto-optically cooled atoms in microgravity as a first result of the collaboration project ATKAT (atom catapult). We present the compact and robust setup for cooling and trapping neutral 87Rb atoms in microgravity conditions in the drop tower in Bremen⊥ and discuss the specific requirements the setup has to meet. In particular we present a small size and mechanically stable laser system and discuss the specifics of the ultra high vacuum chamber. A free falling magneto-optical trap (MOT) as realized in this project provides a basis for further experiments which aim at investigating cold quantum matter in microgravity. [ABSTRACT FROM AUTHOR]

Published
2007
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