ISSTT Proceedings

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Development of THz Quantum Cascade Laser as a Local Oscillator for Heterodyne Receivers

Authors:
Y. Irimajiri, S. Shiba, N. Sekine, I. Hosako, T. Koyama, T. Yamakura, H. Maezawa, and S. Yamamoto
Abstract:
We are developing THz-QCL (quantum cascade laser) as a local oscillator for heterodyne receivers. THz-QCLs are made of GaAs/Al0.15Ga0.85As using resonant LO phonon scattering depopulation scheme, and processed in a metal-metal waveguide using gold-gold thermo compression wafer bonding technique. CW mode operation of the THz-QCL has been achieved up to a heat-sink temperature of 74 K at the lasing frequency of 3.1 THz using a device with the size of 40 µm wide and 1.5 mm long fabricated by dry-etching method. The peak output power was measured to be about 34 µW at a heat-sink temperature of 15 K. We have also detected the QCL output with an HEB (Hot Electron Bolometer) mixer as a change in the I-V characteristic of the HEB mixer. The HEB mixers using an NbTiN ultra thin film as the superconducting material are coupled with the THz radiation by a quasi-optics twin slot antenna. The receiver noise temperature was measured to be 5600K in DSB.
Categories:
Poster Session, Miscellaneous
Year:
2011
Session:
PS
Full-text:
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Page Number(s):
101-104