Abstract

A novel technique is described for monitoring transient infrared absorptions with a tunable diode laser (TDL). The technique involves modulating the TDL at frequencies as high as 250 kHz and using both analog and digital subtraction of background signals. Transient absorptions as small as 0.001% can be detected with a response time of a few microseconds. The technique provides excellent discrimination between transient absorption lines and spurious effects such as beam deflection. Transient detection of the CF2 radical in a photolysis cell is used to illustrate the technique, and a comparison is made with more conventional TDL detection methods. The modulation technique is clearly a very powerful tool for transient infrared spectroscopy.

© 1987 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Electrooptic modulation methods for high sensitivity tunable diode laser spectroscopy

David A. Glenar, Donald E. Jennings, and Shacher Nadler
Appl. Opt. 29(15) 2282-2288 (1990)

High sensitivity pollution detection employing tunable diode lasers

J. Reid, J. Shewchun, B. K. Garside, and E. A. Ballik
Appl. Opt. 17(2) 300-307 (1978)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription