Abstract

DIAL measurements may be wrongly interpreted due to any absorption cross-section inaccuracy. In the case of water vapor, a determination within a few percent is generally needed. On the other hand, for temperature measurement, an accuracy within 2 × 10⁻³ is required to obtain a temperature error within the tenth of a degree. The experimental setup for H₂O and O₂ spectroscopic measurement consists of using a White cell. The experimental condition and measurement accuracy will be discussed. First, we used a cw ring dye laser. Results of absorption cross section as well as linewidth and line shape are presented.

© 1985 Optical Society of America