Optically pumped submillimeter laser heterodyne receivers: astrophysical observations and recent technical developments

Chin, G.

doi:10.1109/5.175255

Cited by 10 publications

(3 citation statements)

References 47 publications

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“…THz technology spanning the Far-Infrared (FIR) and Sub-Millimeter (SMM) wavelengths has applications in astrophysics, earth and planetary science and a stabilized Local Oscillator (LO) is a critical component to build Terahertz (THz) instruments that enable airborne and ground based science investigations [4] [6]. Compact and stable THz receivers can be mounted on a spacecraft, aircraft, balloon or in a cubesat to measure dynamics in the atmosphere, trace gas distribution, radiation balance and thermal structure [5].…”

Section: Introductionmentioning

confidence: 99%

Development of 3–5 THz harmonic mixer

Bulcha

Hesler

Drakinskiy

et al. 2017

2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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There is a high need for >2 THz room temperature direct-detectors/harmonic-mixers to characterize THz optical sources, phase lock THz-QCLs as LO sources for multi-pixel receivers, and realize absolute frequency calibration sources for applications in astrophysics, earth science, and remote sensing. Thus, we have developed a WM-52 (WR-0.22) harmonic mixer for the 3 -5 THz operation. The design, fabrication and assembly of the THz mixer are discussed.

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Section: Introductionmentioning

confidence: 99%

Development of 3–5 THz harmonic mixer

Bulcha

Hesler

Drakinskiy

et al. 2017

2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…Gas lasers are candidate sources of coherent power at the upper end of this frequency range. However, they have small bandwidths and probably have limited applicability particularly in airborne or space-borne systems because of size and weight considerations [4]. As a spectroscopic source, they are relatively expensive.…”

mentioning

confidence: 99%

Folded Waveguide Traveling-Wave Tube Sources for Terahertz Radiation

Bhattacharjee

Booske

Kory

et al. 2004

IEEE Trans. Plasma Sci.

233

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Abstract-Microfabricated folded waveguide traveling-wave tubes (TWTs) are potential compact sources of wide-band, high-power terahertz radiation. We present feasibility studies of an oscillator concept using an amplifier with delayed feedback. Simulations of a 560-GHz oscillator and experimental evaluation of the concept at 50 GHz are presented. Additionally, results from various fabrication methods that are under investigation, such as X-ray lithography, electroforming, and molding (LIGA), UV LIGA, and deep reactive ion etching are presented. Observations and measurements are reported on the generation of stable single-frequency oscillation states. On varying the feedback level, the oscillation changes from a stable single-frequency state at the threshold to multifrequency spectra in the overdriven state. Simulation and experimental results on amplifier characterization and dynamics of the regenerative TWT oscillator include spectral evolution and phase stability of the generated frequencies. The results of the experiment are in good agreement with the simulations.Index Terms-Delayed feedback oscillator, folded waveguide (FWG) traveling-wave tube (TWT), frequency spectrum, high power, microfabrication, phase, terahertz radiation, wide-band.

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“…Operation frequencies range from 0.5 THz to 3 THz, however, not all lines are covered, and some of the gases required are nowadays under strict environmental safety polices [1]. This kind of laser have played a major role in the past, sustaining much astronomical and Earth-based spectroscopy research experiments, [314], [315]. However, although at the beginning of the THz revolution they were still reviewed as essentially the principal kind of THz laser sources [1], and despite of the fact of their high power levels still attract some specific research [316], they have been displaced these last years by the advances in direct semiconductors lasers and, especially, by the revolution experimented in the area of QCLs.…”

Section: Optical Sourcesmentioning

confidence: 99%

Analysis and design of efficient passive components for the millimeter-wave and THz bands

Verdú¹,

Antonio²

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To my parents, brother and sister."Success is peace of mind which is a direct result of self-satisfaction in knowing you made the effort to become the best of which you are capable."Jonh Wooden "Lo que con mucho trabajo se adquiere, más se ama." Aristóteles AgradecimientosLa realización de esta tesis ha implicado no pocos años de trabajo y esfuerzo. Durante este importante periodo de mi vida han sido muchas las personas han estado a mi lado, brindándome su apoyo, ayuda, cariño y amor. Ya sea de una forma u otra, todas estas personas han contribuido a que este trabajo haya sido posible dando como fruto esta tesis. A todos ellos, me gustaría dedicarles un agradecimiento muy especial de todo corazón.Sin duda alguna, debo dar las gracias en primer lugar a mi director de tesis Mariano Baquero. Mariano, has sido un padre para mí profesionalmente hablando. Te conocí como alumno en las clases de Microondas, en las cuales me abriste la puerta a un conocimiento que me fascinó.Recuerdo perfectamente cuando fui a verte para preguntarte si podrías dirigirme el Proyecto Final de Carrera, y desde ese año 2009 hemos estado trabajando juntos. Quiero agradecerte no sólo haberme dado la oportunidad de trabajar en cada momento en elárea que más me ha gustado, sino el haberte preocupado por mí a nivel personal, velando siempre por mis intereses, ayudándome a desarrollarme personal y profesionalmente. Extiendo en este sentido mi agradecimiento a Miguel Ferrando. Si Mariano es el padre, tu serías sin duda el abuelo. Sin tu ayuda, la beca para la realización de esta tesis y los proyectos que han respaldado la misma no hubieran sido posibles. Tu esfuerzo ha permitido que el Grupo de Radiación Electromagnética (GRE) esté hoy dónde esta y que sus miembros nos beneficiemos de un entorno de trabajo excelente, produciendo trabajo de calidad. Debo agradecerte también tus siempre innovadoras ideas, algunas de las cuales se han convertido en una realidad plasmada en esta tesis.Una mención especial merece Daniel Sánchez. Dani, aunque tu nombre no figure como co-director bien sabes que podría estarlo. Jamás podré agradecerte lo suficiente la ayuda que me has prestado. Cuántas horas dedicadas a enseñarme en un sin fin de aspectos sin esperar nada a cambio, apoyándome también en los momentos difíciles, siempre presentes en una tesis. Bien sabes que lo mismo has hecho con cada uno tus compañeros, por eso eres el pilar del GRE Dani.Otra persona a la que estoy muy agradecido es a Vicente Boria. Tu activa colaboración en la dirección de esta tesis ha sido indispensable para la consecución de los resultados más relevantes de la misma. Sugeriste muy acertadamente una estancia en la Queen's University of Belfast, y me abriste la puerta a nuevas líneas de investigación en las cuales seguimos trabajando actualmente. Gracias por preocuparte por mi a nivel profesional y personal.En elámbito anterior, extiendo los agradecimientos a todo el GRE. It is also very important for me to acknowledge Prof. Vince Fusco. Thank you for hosting me in your group in Belfast ...

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Optically pumped submillimeter laser heterodyne receivers: astrophysical observations and recent technical developments

Cited by 10 publications

References 47 publications

Development of 3–5 THz harmonic mixer

Development of 3–5 THz harmonic mixer

Folded Waveguide Traveling-Wave Tube Sources for Terahertz Radiation

Analysis and design of efficient passive components for the millimeter-wave and THz bands

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