First In-Field Application of a Full Photonic Local Oscillator to Terahertz Astronomy

Mayorga, Iván Cámara; Schmitz, A.; Klein, Thomas; Leinz, C.; Güsten, R.

doi:10.1109/tthz.2012.2191286

Cited by 34 publications

(17 citation statements)

References 13 publications

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“…Photomixer-based sources have demonstrated several µW of power at 1 THz [27]. Despite this promising result, this is not sufficient yet to pump our HEB detectors with a straightforward and broadband beam-splitter coupling optics.…”

Section: B Upgreat Lfa Local Oscillator 1) Introductionmentioning

confidence: 99%

First Supra-THz Heterodyne Array Receivers for Astronomy With the SOFIA Observatory

Risacher

Güsten

Stützki³

et al. 2016

IEEE Trans. THz Sci. Technol.

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Abstract-We present the upGREAT THz heterodyne arrays for far-infrared astronomy. The Low Frequency Array (LFA) is designed to cover the 1.9-2.5 THz range using 2x7-pixel waveguide-based HEB mixer arrays in a dual polarization configuration. The High Frequency Array (HFA) will perform observations of the [OI] line at ~4.745 THz using a 7-pixel waveguide-based HEB mixer array. This paper describes the common design for both arrays, cooled to 4.5 K using closedcycle pulse tube technology. We then show the laboratory and telescope characterization of the first array with its 14 pixels (LFA), which culminated in the successful commissioning in May 2015 aboard the SOFIA airborne observatory observing the [CII] fine structure transition at 1.905 THz. This is the first successful demonstration of astronomical observations with a heterodyne focal plane array above 1 THz and is also the first time highpower closed-cycle coolers for temperatures below 4.5 K are operated on an airborne platform.

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Section: B Upgreat Lfa Local Oscillator 1) Introductionmentioning

confidence: 99%

First Supra-THz Heterodyne Array Receivers for Astronomy With the SOFIA Observatory

Risacher

Güsten

Stützki³

et al. 2016

IEEE Trans. THz Sci. Technol.

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“…Nevertheless, spectroscopy applications have been the ones that have driven the THz development since the 70´s due to their importance in radioastronomy [7]. Even today, it remains the main field of application within the THz range, widely used in security [2], material identification and inspection [8], biomedicine [9] and radioastronomy [10], [11].…”

Section: Introductionmentioning

confidence: 99%

“…This means that the mixing process can be carried out remotely. This is a really interesting feature for remote spectroscopy, remote sensing and Local Oscillator (LO) distribution in radioastronomy heterodyne receivers [11]. With respect to the integration potential, a great effort is placed today and Photonic Integrated Circuits (PICs) for subTHz generation have been already implemented [24].…”

Section: Introductionmentioning

confidence: 99%

Continuous-Wave Sub-THz Photonic Generation With Ultra-Narrow Linewidth, Ultra-High Resolution, Full Frequency Range Coverage and High Long-Term Frequency Stability

Criado

Dios

Prior

et al. 2013

IEEE Trans. THz Sci. Technol.

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IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.1 Abstract-We report on a photonic system for generation of high quality Continuous Wave (CW) sub-THz signals. The system consists on a Gain-Switching-based Optical Frequency Comb Generator (GS-OFCG), a two-optical-modes selection mechanism and a n-i-pn-i-p superlattice photomixer. As mode selection mechanism, both selective tunable optical filtering using FabryPerot Tunable Filters (FPTF) and Optical Injection Locking (OIL) are evaluated. The performance of the reported system surpasses in orders of magnitude the performance of any commercially available optical mm-wave and sub-THz generation system in a great number of parameters. It matches and even overcomes those of the best commercially available electronic THz generation systems. The performance parameters featured by our system are: linewidth <10 Hz at 120 GHz, complete frequency range coverage (60-140 GHz) with a resolution in the order of 0.1 Hz at 120 GHz (10 -12 of generated frequency), and high long term frequency stability (5 Hz deviation over one hour). Most of these values are limited by the measurement instrumentation accuracy and resolution, thus the actual values of the system could be better than the reported ones. The frequency can be extended straightforwardly up to 1 THz extending the OFCG frequency span. This system is compact, robust, reliable, and offers a very high performance, especially suited for sub-THz photonic Local Oscillators and high resolution spectroscopy.

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“…They are particularly attractive for molecular fingerprint spectroscopy, since rotational excitations in many molecules of interest such as drugs, explosives and poisonous contamination fall within the THz region of the spectrum [1][2][3]. Additionally, THz waves are important for quantum coherence experiments [4], and are instrumental in radio-astronomy [5]. In the field of communications, millimeter-and terahertz-waves theoretically enable the wireless transmission of data at rates of up to several Tbit/s, over outdoor links and within data centers.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the quality of the generated wave defines the transmissible data rate. However, the generation of high-quality THz-waves is technologically challenging, and is currently restricting many of their potential applications [5]. CW-THz waves can be generated through electronic up-conversion of radio and microwave-frequency tones [7,8].…”

Section: Introductionmentioning

confidence: 99%

Generation of ultra-narrow, stable and tunable millimeter- and terahertz- waves with very low phase noise

Preußler¹,

Wenzel²,

Braun³

et al. 2013

Opt. Express

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The interference between two spectral lines of the frequency comb of a fiber femtosecond laser is used to generate millimeter-wave and terahertz tones. The two lines are selected by stimulated Brillouin scattering (SBS) amplification. All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with SBS. The inherent high spectral quality of a femtosecond fiber laser comb allows generation of millimeter-and terahertz waves with linewidths below 1 Hz, and a phase noise of -105 dBc/Hz at 10 kHz offset. The generation, free-space transmission and detection of continuous waves at 1 THz are demonstrated as well. Lastly, the generated millimeterwave carriers are modulated by 40 Gbit/s data. The entire system consists of a fiber laser and standard equipment of optical telecommunications. Besides metrology, spectroscopy and astronomy, the method can be utilized for the emergent field of wireless millimeter-wave and THz-communications at ultra-high data rates. Abstract: The interference between two spectral lines of the frequency comb of a fiber femtosecond laser is used to generate millimeter-wave and terahertz tones. The two lines are selected by stimulated Brillouin scattering (SBS) amplification. All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with SBS. The inherent high spectral quality of a femtosecond fiber laser comb allows generation of millimeter-and terahertz waves with linewidths below 1 Hz, and a phase noise of -105 dBc/Hz at 10 kHz offset. The generation, free-space transmission and detection of continuous waves at 1 THz are demonstrated as well. Lastly, the generated millimeter-wave carriers are modulated by 40 Gbit/s data. The entire system consists of a fiber laser and standard equipment of optical telecommunications. Besides metrology, spectroscopy and astronomy, the method can be utilized for the emergent field of wireless millimeter-wave and THz-communications at ultra-high data rates.

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First In-Field Application of a Full Photonic Local Oscillator to Terahertz Astronomy

Cited by 34 publications

References 13 publications

First Supra-THz Heterodyne Array Receivers for Astronomy With the SOFIA Observatory

First Supra-THz Heterodyne Array Receivers for Astronomy With the SOFIA Observatory

Continuous-Wave Sub-THz Photonic Generation With Ultra-Narrow Linewidth, Ultra-High Resolution, Full Frequency Range Coverage and High Long-Term Frequency Stability

Generation of ultra-narrow, stable and tunable millimeter- and terahertz- waves with very low phase noise

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