Abstract

The spectral slit width of a monochromator is defined as the half-intensity band width of frequencies passed by the exit slit. This paper discusses its measurement using methods similar to those used to measure the frequency transmission of electrical networks. A Fabry-Pérot interferometer, used as a sinusoidal signal generator, produces interference fringes constantly spaced in wave numbers at a known amplitude input to the monochromator. It can be shown that the attenuation of the fringe pattern as the spacing is changed is a function of the exit-slit output-intensity distribution function. From this information the spectral slit width in any spectral region can be measured and the exit-slit function indicated.

The sensitivity of measurement is limited by the fringe amplitude obtainable from the interferometer, which is a function of the reflectivity of the interferometer plates and their adjustment. Rays passing through the interferometer at other than normal incidence tend also to damp the fringe pattern.

© 1955 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Experimental observation of invariance of spectral degree of coherence with change in bandwidth of light

Bhaskar Kanseri and Hem Chandra Kandpal
Opt. Lett. 35(1) 70-72 (2010)

A Double Beam, High Resolution Spectrometer for the Far Infrared

T. M. Hard and R. C. Lord
Appl. Opt. 7(4) 589-598 (1968)

Interferometric Frequency Calibration of Infrared Spectrometers

Svend Brodersen
J. Opt. Soc. Am. 46(4) 255-258 (1956)

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 (8)

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 (19)

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