A reflective millimeter-wave photonic limiter

We present the possibility of effective doubling of millimeter wave radiation in the range of 400-2500 μm in borate crystals. The phase matching angles are calculated. It is shown that for LN and β-BBO crystals the realization of o + o → e and e + o → e interactions is possible, and for LB4 only o + o → e. The walk-off angle, spectral and angular phase-matching bandwidth are calculated. An estimate is given of the maximum efficiency of SHG taking into account the measured optical damage threshold of 150 TW/cm2 for the LB4 crystal and 100 TW/cm2 for β-BBO.

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Focusing of high power millimeter-wave radiation by a quasi-optical antenna system

International Journal of Electronics ◽

10.1080/00207219108921342 ◽

1991 ◽

Vol 70 (5) ◽

pp. 979-988 ◽

Cited By ~ 6

Author(s):

SHOJI MIYAKE ◽

OSAMI WADA ◽

MASAMITSU NAKAJIMA ◽

TOSHITAKA IDEHARA ◽

G. F. BRAND

Keyword(s):

Millimeter Wave ◽

High Power ◽

Antenna System ◽

Wave Radiation ◽

Optical Antenna

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Pseudospark-sourced sheet electron beam for application in high power millimeter wave radiation generation

2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) ◽

10.1109/irmmw-thz.2018.8510191 ◽

2018 ◽

Author(s):

H. Yin ◽

G. Shu ◽

L. Zhang ◽

W. Rej ◽

J. Zhao ◽

...

Keyword(s):

Electron Beam ◽

Millimeter Wave ◽

High Power ◽

Wave Radiation ◽

Radiation Generation ◽

Sheet Electron Beam

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Linewidth measurement of millimeter wave radiation from a Josephson array source coupled to free space

IEEE Transactions on Applied Superconductivity ◽

10.1109/77.783982 ◽

1999 ◽

Vol 9 (2) ◽

pp. 4325-4328 ◽

Cited By ~ 2

Author(s):

S. Deus ◽

S. Kiryu

Keyword(s):

Millimeter Wave ◽

Free Space ◽

Wave Radiation ◽

Linewidth Measurement ◽

Josephson Array

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Sintering of Ceramics by High Power 28GHz Millimeter-wave Radiation

The Proceedings of the Materials and processing conference ◽

10.1299/jsmemp.2003.11.371 ◽

2003 ◽

Vol 2003.11 (0) ◽

pp. 371-372

Author(s):

Yukio MAKINO ◽

Shoji MIYAKE

Keyword(s):

Millimeter Wave ◽

High Power ◽

Wave Radiation

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Advanced Ceramics Sintering Using High-Power Millimeter-Wave Radiation

MRS Proceedings ◽

10.1557/proc-430-533 ◽

1996 ◽

Vol 430 ◽

Cited By ~ 3

Author(s):

Y. Setsuhara ◽

M. Kamai ◽

S. Kinoshita ◽

N. Abe ◽

S. Miyake ◽

...

Keyword(s):

Silicon Nitride ◽

Millimeter Wave ◽

High Power ◽

Antenna System ◽

Wave Radiation ◽

Optical Antenna ◽

60 Ghz ◽

Densification Temperature ◽

Multi Mode ◽

Focused Beam

AbstractThe results of ceramics sintering experiments using high-power millimeter-wave radiation are reported. Sintering of silicon nitride with 5%Al2O3 and 5%Y2O3 was performed in a multi-mode applicator using a 10-kW 28-GHz gyrotron in CW operation. It was found that the silicon nitride samples sintered with 28 GHz radiation at 1650'C for 30 min reached to as high as theoretical density (TD), while the conventionally sintered samples at 1700°C for 60 min resulted in the density as low as 90% TD. Focusing experiments of millimeter-wave radiation from the high-power pulsed 60-GHz gyrotron have been performed using a quasi-optical antenna system (two-dimensional ellipso-parabolic focusing antenna system) to demonstrate the feasibility of the power density of as high as 100 kW/cm2. Typical heating characteristics using the focused beam were made clear for this system. It was found that the densification of yttria-stabilized zirconia (ZrO2-8mol%Y2O3) samples to as high as 97% TD was obtained from the sintering with focused 60 GHz beam in pulse operation with a 10-ms pulse duration at a 0.5Hz repetition. The densification temperature for the zirconia could be lowered by 200°C than that expected conventionally.

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