Abstract

A liquid detection system consisting of a diode laser with multiple short external cavities (MSXC’s) is reported. The MSXC diode laser operates single mode on one of 18 distinct modes that span a range of 72 nm. We selected the modes by setting the length of one of the external cavities using a piezoelectric positioner. One can measure the transmission through cells by modulating the injection current at audio frequencies and using phase-sensitive detection to reject the ambient light and reduce 1/f noise. A method to determine regions of single-mode operation by the rms of the output of the laser is described. The transmission data were processed by multivariate calibration techniques, i.e., partial least squares and principal component regression. Water concentration in acetone was used to demonstrate the performance of the system. A correlation coefficient of R2 = 0.997 and 0.29% root-mean-square error of prediction are found for water concentration over the range of 2–19%.

© 1996 Optical Society of America

Full Article  |  PDF Article
Related Articles
Narrow-linewidth vertical-cavity surface-emitting lasers for oxygen detection

Hans P. Zappe, Martin Hess, Michael Moser, Rainer Hövel, Karlheinz Gulden, Hans-Peter Gauggel, and Fabrice Monti di Sopra
Appl. Opt. 39(15) 2475-2479 (2000)

Wavelength-modulation detection of acetylene with a near-infrared external-cavity diode laser

Daniel B. Oh and David Christian Hovde
Appl. Opt. 34(30) 7002-7005 (1995)

Application of antimonide lasers for gas sensing in the 3–4-µm range

Peter Werle and Andrei Popov
Appl. Opt. 38(9) 1494-1501 (1999)

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 (5)

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

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