Demonstration of a room temperature 2.48–2.75 THz coherent spectroscopy source

Pearson, John C.; Drouin, Brian J.; Maestrini, A.; Mehdi, Imran; Ward, J.; Lin, Robert; Yu, Shanshan; Gill, John; Thomas, B.; Lee, Choonsup; Chattopadhyay, Goutam; Schlecht, Erich; Maiwald, Frank; Goldsmith, Paul F.; Siegel, Peter H.

doi:10.1063/1.3617420

Cited by 86 publications

(59 citation statements)

References 54 publications

(73 reference statements)

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“…Measurements from Jet Propulsion Laboratory (JPL) utilized a modular frequency multiplication spectrometer built from a microwave synthesizer and amplifier-multiplier components (Drouin et al 2005;Pearson et al 2011). Measurements were done at room temperature in the following frequency windows: 1.061−1.093 THz, 1.575−1.625 THz and 2.560−2.660 THz at pressures ranging from 25−140 μbar.…”

Section: Methodsmentioning

confidence: 99%

Rotational spectroscopy of methylamine up to 2.6 THz

Motiyenko

Ilyushin

Drouin

et al. 2014

A&A

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Context. Methylamine (CH 3 NH 2 ) is the simplest primary alkylamine that has been detected in the interstellar medium. The molecule is relatively light, with the 50 K Boltzmann peak appearing near 800 GHz. However, reliable predictions for its rotational spectrum are available only up to 500 GHz. Spectroscopic analyses have been complicated by the two large-amplitude motions: internal rotation of the methyl top and inversion of the amino group. Aims. To provide reliable predictions of the methylamine ground state rotational spectrum above 500 GHz, we studied its rotational spectrum in the frequency range from 500 to 2650 GHz. Methods. The spectra of methylamine were recorded using the spectrometers based on Schottky diode frequency multiplication chains in the Lille laboratory (500−945 GHz) and in JPL (1060−2660 GHz). The analysis of the rotational spectrum of methylamine in the ground vibrational state was performed on the basis of the group-theoretical high barrier tunneling Hamiltonian developed for methylamine by Ohashi and Hougen. Results. In the recorded spectra, we have assigned 1849 new rotational transitions of methylamine. They were fitted together with previously published data, to a Hamiltonian model that uses 76 parameters with an overall weighted rms deviation of 0.87. On the basis of the new spectroscopic results, predictions of transition frequencies in the frequency range up to 3 THz with J ≤ 50 and K a ≤ 20 are presented.

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Section: Methodsmentioning

confidence: 99%

Rotational spectroscopy of methylamine up to 2.6 THz

Motiyenko

Ilyushin

Drouin

et al. 2014

A&A

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“…Millimeter-wave and submillimeter-wave frequency multipliers [1][2][3][4][5][6] and mixers [7][8][9][10][11][12][13][14] based on planar Schottky diodes are widely used for atmosphere and space detection. The multipliers are usually driven by an oscillator [15][16][17][18] or a phase-locked millimeter-wave source.…”

Section: Introductionmentioning

confidence: 99%

“…The multipliers are usually driven by an oscillator [15][16][17][18] or a phase-locked millimeter-wave source. Up to tens of microwatts power at room temperature was produced at 2.7 THz with cascaded frequency multipliers designed with Schottky Varactors [1]. This power level is sufficient to pump the HEB receiver.…”

Section: Introductionmentioning

confidence: 99%

“…The balanced frequency multipliers, mostly the frequency doublers and frequency triplers, usually have two arms of the diodes [1][2][3][4][5][6]. The early multiplers usually employ only two diodes, with each diode in one arm limited by the chip process at that time.…”

Section: Introductionmentioning

confidence: 99%

“…State-of-the-art performance has been achieved by balanced frequency doubler with Erickson's scheme [1,3], in which the diodes are in anti-series connection with the end of each arm bonded to the metal channel. The reverse bias is applied to the diodes from the center line connected to the cathodes of the two arms.…”

Section: Introductionmentioning

confidence: 99%

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A New Scheme for the Design of Balanced Frequency Tripler With Schottky Diodes

Guo¹,

Xu²,

Qian³

2013

PIER

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Abstract-We propose a balanced frequency tripler scheme for millimeter-wave and submillimeter-wave application, in which doublesided suspended stripline is adopted. Two arms of Schottky diodes are mounted on the upper side of the substrate, and the other two arms of diodes are mounted on the lower side. The diodes are DC biased without bypass chip capacitor, which is essential in the common used balanced tripler scheme. Furthermore, the numbers of the diodes are doubled as there are only two arms of diodes in the common balanced tripler scheme, and this will double the power handling capability of the tripler. A W-band frequency tripler is designed according to the proposed scheme with commercial Schottky Varistors. The output power is from 2.9 to 5.7 dBm at the frequencies from 89.7 to 94.8 GHz, with the conversion efficiency from 1.95% ∼ 3.7%.

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THz limb sounder (TLS) for lower thermospheric wind, oxygen density, and temperature

Yee

Schlecht

et al. 2016

JGR Space Physics

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Neutral winds are one of the most critical measurements in the lower thermosphere and E region ionosphere (LTEI) for understanding complex electrodynamic processes and ion‐neutral interactions. We are developing a high‐sensitivity, low‐power, noncryogenic 2.06 THz Schottky receiver to measure wind profiles at 100–140 km. The new technique, THz limb sounder (TLS), aims to measure LTEI winds by resolving the wind‐induced Doppler shift of 2.06 THz atomic oxygen (OI) emissions. As a transition between fine structure levels in the ground electronic state, the OI emission is in local thermodynamic equilibrium (LTE) at altitudes up to 350 km. This LTE property, together with day‐and‐night capability and small line‐of‐sight gradient, makes the OI limb sounding a very attractive technique for neutral wind observations. In addition to the wind measurement, TLS can also retrieve [OI] density and neutral temperature in the LTEI region. TLS leverages rapid advances in THz receiver technologies including subharmonically pumped (SHP) mixers and Schottky‐diode‐based power multipliers. Current SHP Schottky receivers have produced good sensitivity for THz frequencies at ambient environment temperatures (120–150 K), which are achievable through passively cooling in spaceflight. As an emerging technique, TLS can fill the critical data gaps in the LTEI neutral wind observations to enable detailed studies on the coupling and dynamo processes between charged and neutral molecules.

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Demonstration of a room temperature 2.48–2.75 THz coherent spectroscopy source

Cited by 86 publications

References 54 publications

Rotational spectroscopy of methylamine up to 2.6 THz

Rotational spectroscopy of methylamine up to 2.6 THz

A New Scheme for the Design of Balanced Frequency Tripler With Schottky Diodes

THz limb sounder (TLS) for lower thermospheric wind, oxygen density, and temperature

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