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Optics and Lasers in Engineering 37 (2002) 159170 Frequency conversion in novel materials and its

Summary: Optics and Lasers in Engineering 37 (2002) 159170
Frequency conversion in novel materials and its
application to high resolution gas sensing
Ady Arie*, Keren Fradkin-Kashi, Yonatan Shreberk
Department of Electrical Engineering, Physical Electronics, Faculty of Engineering, Tel-Aviv University,
Tel-Aviv 69978, Israel
Received 9 April 2001; received in revised form 14 May 2001; accepted 15 May 2001
We have constructed a compact room-temperature mid-infrared spectrometer and
gas sensor, based on quasi-phase matched difference-frequency generation in periodically
poled ferroelectric crystals of the KTiOPO4 family, namely: KTiOPO4, KTiOAsO4 and
RbTiOAsO4. The wide tunabilty of the spectrometer (3.13.75 mm) enables us to cover an
entire vibrational band of gases such as methane and nitrous oxide. The high spectral
resolution (B1 MHz) is used to investigate the spectral profile of the hyperfine components of
a single rotational transition. The sensitivity of the described spectrometer is B75 parts per
million. Applications of this technology include the detection of polluting or toxic gases,
biomedical sensing, atmospheric research, volcanic monitoring and industrial process control.
r 2002 Elsevier Science Ltd. All rights reserved.
Keywords: Optical sensor; Laser
1. Introduction


Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University


Collections: Engineering