Dual-wavelength THz imaging with quantum cascade lasers

Danielle R. Chamberlin; Peter R. Robrish; William R. Trutna Jr.; Giacomo Scalari; Marcella Giovannini; Lassaad Ajili; Jerome Faist; Harvey E. Beere; David A. Ritchie

doi:10.1117/12.589476

25 March 2005 Dual-wavelength THz imaging with quantum cascade lasers

Danielle R. Chamberlin, Peter R. Robrish, William R. Trutna Jr., Giacomo Scalari, Marcella Giovannini, Lassaad Ajili, Jerome Faist, Harvey E. Beere, David A. Ritchie

Author Affiliations +

Proceedings Volume 5727, Terahertz and Gigahertz Electronics and Photonics IV; (2005) https://doi.org/10.1117/12.589476
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

We have assembled an imaging system using quantum cascade lasers at frequencies of both 3.4 and 2.3 THz. Images at the two frequencies and the resulting absorption coefficients are compared. We demonstrate imaging in both reflection and transmission. The lasers are operated in a closed-cycle refrigerator and we use a peak output power of >2.5 mW at 7-10% duty cycle and 22-40 K operating temperature. The focal spot size is approximately 300 microns for both lasers and is not diffraction-limited. The signal is detected with a single-element DTGS detector, and images are captured by scanning the sample. Applications enabled by longer wavelengths are demonstrated, as well as the determination of chemical information through imaging at two wavelengths.

Citation Download Citation

Danielle R. Chamberlin, Peter R. Robrish, William R. Trutna Jr., Giacomo Scalari, Marcella Giovannini, Lassaad Ajili, Jerome Faist, Harvey E. Beere, and David A. Ritchie "Dual-wavelength THz imaging with quantum cascade lasers", Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); https://doi.org/10.1117/12.589476

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available