Abstract

Laser calorimetry was used to measure the optical absorption of several candidate window materials for application at CO laser wavelengths. These materials include KCl, CaF2, SrF2, and ZnSe. The long, thin bar technique was used to separate bulk and surface absorption contributions by means of their time dependencies. One sample of KCl, known to be low absorbing at 10.6 μm, exhibited no measurable absorption within the sensitivity of the calorimeter (βt < 2 × 10−6 cm−1). The absorption coefficients measured for two samples of CaF2 at 5.41 μm were higher than those measured by other investigators at 5.25 μm, but, when fitted to an exponential dependence on wavelength, compared favorably with currently measured values. To compare results from different laboratories, precise definition of the spectral power distribution is essential. The surface absorption was, in all cases, small relative to similar measurements at 10.6 μm; in several cases it was not separable from bulk absorption by the technique used.

© 1977 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Photoacoustic measurements of surface and bulk absorption in HF/DF laser window materials

A. Hordvik and L. Skolnik
Appl. Opt. 16(11) 2919-2924 (1977)

Calorimetric absorption coefficient measurements using pulsed CO2 lasers

L. C. Nistor, S. V. Nistor, V. Teodorescu, Eva Cojocaru, and I. N. Mihǎilescu
Appl. Opt. 18(20) 3517-3521 (1979)

Infrared bulk and surface absorption by nearly transparent crystals

Herbert B. Rosenstock, Don A. Gregory, and James A. Harrington
Appl. Opt. 15(9) 2075-2079 (1976)

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 (7)

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

Tables (2)

You do not have subscription access to this journal. Article tables 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