Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Tunable metal film filters as narrowband ir laser reflectors

Not Accessible

Your library or personal account may give you access

Abstract

An approximate mathematical description of tunable metal film reflector filters for the medium and far ir is derived. The absorptive film is characterized by two easily measured quantities, and a mirror reflectivity smaller than one is taken into account. The dependence of reflectivity, phase, and transmissivity on wavelength is studied. Expressions for the filter bandwidth and a lower limit of the bandwidth are obtained. Minimum losses depend primarily on the reflection coefficient of the mirror and not on the film properties. Two interesting configurations can be distinguished: one with high loss and small bandwidth (I) and one with low loss and large bandwidth (II). Measurements of bandwidth and minimum losses at 10 gm using Ge and ZnSe film substrates and gold and aluminum films show very good agreement with theory. Typical experimental results for configuration I yielded a 4.6% bandwidth (given as fraction of the free spectral range) and 2.9% additional reflection losses (caused by the insertion of the film). Smaller losses (≈0.5%) were obtained in configuration II in connection with broader bandwidths. Possible applications include low loss longitudinal mode suppression and rotational line selection in gas lasers.

© 1976 Optical Society of America

Full Article  |  PDF Article
More Like This
Hybrid metal mesh-dielectric mirrors for optically pumped far infrared lasers

E. J. Danielewicz and Paul D. Coleman
Appl. Opt. 15(3) 761-767 (1976)

Power dependence of reflectivity of metallic films

Y. C. Yeh and O. M. Stafsudd
Appl. Opt. 15(1) 127-131 (1976)

Narrowband electrooptic tunable notch filter

Richard Lytel and George F. Lipscomb
Appl. Opt. 25(21) 3889-3895 (1986)

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 Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica 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 Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica 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 Optica member, or as an authorized user of your institution.

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

Equations (38)

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

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

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved