2005 Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics

Both, the W7-X stellarator, which is under construction at IPP-Greifswald, and the ITER Tokamak, which is built at Cadarache, France, is equipped with a strong ECR-heating and current drive system. Both systems are similar in frequency and have CW-capability (140 GHz, 10 MW, CW for W7-X and 170 GHz, 24 MW, 1000 s for ITER). The commissioning of the ECRH plant for W7-X is well under way, the status... View full abstract»

Many atoms and molecules have emission lines that occur at THz frequencies. These emission lines can be used to probe the conditions in giant molecular clouds (GMCs) throughout our galaxy. From studying the star formation process in GMCs we will gain a better understanding of the origin of planetary systems like our own. The high Antarctic plateau offers unique opportunities for observatories opti... View full abstract»

We report a large area time domain terahertz imager capable of imaging 1 square meter in < 100 minutes at 100 pixels/sec. Stationary objects are imaged in transmission and/or reflection. A linear array, under development for rapid luggage or personnel screening, could image a 1 m by 0.4 m area in approximately 4 seconds. View full abstract»

A THz explosives sensor utilizing quantum cascade lasers is described. THz spectra of the targeted explosives are presented along with an overview of the optical layout and the data acquisition and reduction strategy. View full abstract»

We have demonstrated a low-noise heterodyne three-element focal plane array (FPA) at 1.6 THz consisting of NbN hot electron bolometric (HEB) detectors, intimately integrated with monolithic microwave integrated circuit (MMIC) IF amplifiers in a single block. HEB technology is becoming the basis for advanced terahertz imaging and spectroscopic technologies for the study of biological and chemical a... View full abstract»

Results are presented for the first imaging system that combines the high power of terahertz (THz) quantum cascade lasers (QCLs) with the 3D image reconstruction capability of computed tomography (CT). Cross-sectional images of phantoms have been successfully reconstructed revealing both their external and internal structures. View full abstract»

New attention is given to electron magnetic resonance following development at high frequency (HF). Continuous wave spectroscopy is nowadays performed up to 1 THz. There is interest in developing time domain machines and methodology for HF EMR and HF EMR/NMR spectroscopies. We review recent data in THz magneto-optic, describe the conceptual design of a FEL based spectrometer in the 100 to 1,000 GH... View full abstract»

Diffuse reflectance spectroscopy in the visible and NIR is widely used to measure complex dielectric constants of highly scattering opaque materials. Compared with specular reflectance measurements, it has the advantages of low sensitivity to sample position and surface preparation, and improved accuracy in the determination of optical constants. We extend this technique to the THz range, describi... View full abstract»

A beam line for far infrared spectroscopy using Fourier transform infrared spectrometer (FTIR) is constructed as a facility of portable synchrotron MIRRORCLE 20 in Ritsumeikan University. Our research object is to clarify water structure in an aqueous solution and a biological tissue through investigation of intermolecular vibration. We report recent developments in the system and the examples of ... View full abstract»

The attenuated total internal reflection spectroscopy at terahertz frequencies is considered. We have focused on the information carried by the interaction of the evanescent field with the optical material in the place of an optical tunneling barrier. View full abstract»

In this paper we present a very compact cyclotron resonance (CR) spectrometer based on a GaAs/AlGaAs quantum cascade laser emitting at 11.4μm. We show its operation under magnetic fields up to 60 T and in temperatures up to 80K. We, finally, illustrate our spectrometer with the measurements of InAs_xSb_1-x alloy. View full abstract»

The data of dielectric losses in CVD diamonds at unprecedented combination of broad frequency and temperature ranges are presented. A comparison with theory is carried out. The loss mechanisms are evaluated. The consequences for applications for powerful gyrotrons windows, etc., in MM/THz ranges are considered. View full abstract»

The first two-frequency gyrotron has been installed in the new multi-frequency ECRH system at the ASDEX Upgrade Tokamak experiment. In its final stage the system consist of 4 gyrotrons, tunable in the range 105-140 GHz with a total power of 4 MW and a pulse length of 10 s. It employs a fast steerable launcher for feedback controlled deposition that allows for poloidal steering of 10° within 10... View full abstract»

A method for determining the electron density of thin plasma by means of Fabry-Perot interferometry is proposed. The interferometer consists of two plasma layers and dielectric material surrounded by two plasma layers. The electromagnetic wave transmittance and Fabry-Perot resonances for the interferometer are calculated. It is shown that the plasma density can be determined from the measurement o... View full abstract»

The line of gyro-device systems produced jointly by Gycom and IAP for millimetre-wave processing of materials has been extended by two new setups. The general description and major technical specifications of a 5 kW 24.1 GHz gyrotron-based system and a dual-frequency system exploiting a 15 kW 28 GHz gyrotron and a 2.5 kW 24.1 GHz gyro-backward-wave oscillator (BWO) frequency tuneable in the range ... View full abstract»

A microwave beaming thruster boosted by a 170GHz gyrotron was investigated. Plasma was successfully initiated by focusing the millimetre wave beam using a parabolic reflector. The plasma propagation velocity was increased with the beam power density; the velocity became supersonic at the power density beyond 80 kW/cm2. Propulsive impulse was measured through the flight experiments, and ... View full abstract»

Because of the beam forming capability of a millimeter-wave source at 83-GHz, a gyrotron-based system is being used to develop material processing technologies for possible space applications, e.g., the Moon and Mars. Preliminary studies of the interaction of a millimeter-wave beam and simulants of lunar regolith (i.e., 'moon dust') is presented. The configuration of the millimeter-wave processing... View full abstract»

This paper reports on efforts to create fully left-handed meta-materials at multi-THz frequencies, detailed optical characterizations of various structures fabricated, and understanding to date of what the materials limitations are for making these structures smaller and smaller. Presently, authors are using CXRO's nano-writer to create sub-micron structures with 60 nm smallest features. Present r... View full abstract»