Dr. Patrick Pütz Profile

Dr. Patrick Pütz

at Univ zu Köln

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Author

Publications (7)

Proceedings Article | 19 August 2014 Paper

Optics and cryogenics for the 1.1 THz multi-pixel heterodyne receiver for APEX

Norma Hurtado, Urs Graf, Henning Adams, C. Honingh, Karl Jacobs, Patrick Pütz, Rolf Güsten, Jürgen Stutzki

Proceedings Volume 9153, 915327 (2014) https://doi.org/10.1117/12.2055563

KEYWORDS: Receivers, Mirrors, Telescopes, Terahertz radiation, Aluminum, Computer aided design, Heterodyning, Cryogenics, Thermography, Polarizers

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The 1.1 THz multi-pixel heterodyne receiver will be mounted in the Nasmyth A cabin of the 12 m APEX telescope on the Chajnantor plateau, 5000 meters altitude in northern Chile. The receiver will cover the spectral window of 1000 - 1080 GHz, where important spectral lines like CO 9-8 at 1036.9 GHz, a tracer of warm and dense gas and OH+ at 1033 GHz and NH+ at 1012.6 GHz, both important for the study of chemical networks in the ISM, are located. The multi-pixel receiver greatly enhances the science output under the difficult observing conditions in this frequency range. Two 9-pixel focal plane sub-arrays on orthogonal polarizations are installed in easily removable cartridges. We developed a new thermal link to connect the cartridges to the cryostat. Our thermal link is an all-metal design: aluminum and Invar. All the optics is fully reflective, thus avoiding the absorption and reflection losses of dielectric lenses and reducing standing waves in the receiver. To guaranty internal optics alignment, we employ a monolithic integrated optics approach for the cold optics and the Focal Plane Unit (FPU) optics modeled after the CHARM (Compact Heterodyne Array Receiver Module) concept. The receiver uses synthesizer-driven solid-state local oscillators (LO) and the mixers will be balanced SIS mixers, which are essentially based on the design of the on-chip balanced SIS mixers at 490 GHz developed in our institute. Singleended HEB mixers are used for the laboratory tests of the optics. The LO power distribution is accommodated behind the FPU optics. It is composed of the LO optics, which includes a collimating Fourier grating, and an LO distribution plate to supply LO signal to each of the 9 pixels of the sub-array. Different options for the LO coupling design and fabrication are being analyzed and will be based on in-house hybrid waveguide/planar technology. We summarize the receiver project with emphasis on the cryogenics and the optics and present laboratory test results of the cryogenics, including the thermal link's performance. Beam pattern measurements of the receiver optics are scheduled for the coming days, but unfortunately could not be included in the current paper.

Proceedings Article | 27 September 2012 Paper

First observations with SuperCam and future plans

Jenna Kloosterman, Tiara Cottam, Brandon Swift, David Lesser, Paul Schickling, Christopher Groppi, Michael Borden, Allison Towner, Per Schmidt, Craig Kulesa, Christian d'Aubigny, Christopher Walker, Dathon Golish, Sander Weinreb, Glenn Jones, Hamdi Mani, Jacob Kooi, Art Lichtenberger, Patrick Puetz, Gopal Narayanan

Proceedings Volume 8452, 845204 (2012) https://doi.org/10.1117/12.925088

KEYWORDS: Clouds, Heterodyning, Integrated optics, Spectroscopy, Waveguides, Electronics, Photography, Signal processing, Relays, Mirrors

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Proceedings Article | 28 July 2010 Paper

The Stratospheric THz Observatory (STO)

C. Walker, C. Kulesa, P. Bernasconi, H. Eaton, N. Rolander, C. Groppi, J. Kloosterman, T. Cottam, D. Lesser, C. Martin, A. Stark, D. Neufeld, C. Lisse, D. Hollenbach, J. Kawamura, P. Goldsmith, W. Langer, H. Yorke, J. Sterne, A. Skalare, I. Mehdi, S. Weinreb, J. Kooi, J. Stutzki, U. Graf, M. Brasse, C. Honingh, R. Simon, M. Akyilmaz, P. Puetz, Mark Wolfire

Proceedings Volume 7733, 77330N (2010) https://doi.org/10.1117/12.857765

KEYWORDS: Telescopes, Terahertz radiation, Receivers, Observatories, Spectroscopy, Electronics, Signal processing, Stars, Clouds, Control systems

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Proceedings Article | 15 July 2010 Paper

Test and integration results from SuperCam: a 64-pixel array receiver for the 350 GHz atmospheric window

Christopher Groppi, Christopher Walker, Craig Kulesa, Dathon Golish, Jenna Kloosterman, Sander Weinreb, Glenn Jones, Joseph Bardin, Hamdi Mani, Tom Kuiper, Jacob Kooi, Art Lichtenberger, Thomas Cecil, Patrick Puetz, Gopal Narayanan, Abigail Hedden

Proceedings Volume 7741, 77410X (2010) https://doi.org/10.1117/12.857504

KEYWORDS: Spectroscopy, Telescopes, Galactic astronomy, Clouds, Stars, Amplifiers, Waveguides, Receivers, Cryogenics, Mirrors

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Proceedings Article | 18 July 2008 Paper

SuperCam: a 64 pixel heterodyne imaging spectrometer

Christopher Groppi, Christopher Walker, Craig Kulesa, Dathon Golish, Jenna Kloosterman, Patrick Pütz, Sander Weinreb, Thomas Kuiper, Jacob Kooi, Glenn Jones, Joseph Bardin, Hamdi Mani, Arthur Lichtenberger, Thomas Cecil, Abigail Hedden, Gopal Narayanan

Proceedings Volume 7020, 702011 (2008) https://doi.org/10.1117/12.790284

KEYWORDS: Spectroscopy, Galactic astronomy, Clouds, Waveguides, Stars, Optical amplifiers, Prototyping, Receivers, Amplifiers, Telescopes

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Proceedings Article | 6 July 2006 Paper

SuperCam: a 64-pixel heterodyne imaging array for the 870-micron atmospheric window

Christopher Groppi, Christopher Walker, Craig Kulesa, Patrick Pütz, Dathon Golish, Paul Gensheimer, Abigail Hedden, Shane Bussmann, Sander Weinreb, Tom Kuiper, Jacob Kooi, Glenn Jones, Joseph Bardin, Hamdi Mani, Arthur Lichtenberger, Gopal Narayanan

Proceedings Volume 6275, 62750O (2006) https://doi.org/10.1117/12.671856

KEYWORDS: Clouds, Stars, Galactic astronomy, Amplifiers, Carbon monoxide, Spectroscopy, Waveguides, Receivers, Heterodyning, Telescopes

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Proceedings Article | 8 October 2004 Paper

High sensitivity 810 GHz SIS receivers at AST/RO

Patrick Putz, Stefan Glenz, Rafael Teipen, Thomas Tils, Netty Honingh, Karl Jacobs, Abigail Hedden, Craig Kulesa, Christopher Groppi, Christopher Walker

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.550894

KEYWORDS: Receivers, Heterodyning, Waveguides, Niobium, Temperature metrology, Astronomy, Electrodes, Chemical mechanical planarization, Observatories, Carbon

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Showing 5 of 7 publications

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