Abstract

An ultrarapid scanning spectrometer has been constructed that records spectra at a constant angle of diffraction. The spectral scanning is accomplished by the rotation of a high-speed rotating mirror (7.6 cm diam) that causes a collimated light beam to sweep across a plane grating, changing the angle of incidence. The full-aperture scanning range depends upon the over-all grating width, upon the grating spacing, and upon the orientation of the grating with respect to the high-speed mirror. For example, a 12.5-cm, 1200-lines/mm grating gives a scanning range of ~2000 Å on each of two separate detector systems, or a total range of 4000 Å that can be centered at any wavelength between 4000 Å and 8000 Å. This grating provides a theoretical resolving power of ~85,000 in the first order, a reciprocal dispersion of 17.5 Å/mm at f/5, and a spectral scan speed of 115 Å/μsec at 1100 rps. This spectrometer has been used to record, simultaneously, Stark-broadened Hα and Hβ emission line profiles from a transient plasma generated in the impulse tube. Electron densities calculated from the half-width of the Hβ profiles are in good agreement with values obtained by fitting the line wings of the self-absorbed Hα profiles to the theoretical profiles of Griem, Kolb, and Shen.

© 1966 Optical Society of America

Full Article  |  PDF Article
More Like This
Rapid Scan Spectrometers for the Diagnostics of Transient Plasmas

R. A. Hill
Appl. Opt. 7(11) 2184-2189 (1968)

A Rapid Scan Spectrograph for Plasma Spectroscopy

R. A. Hill and E. H. Beckner
Appl. Opt. 3(8) 929-932 (1964)

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

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

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

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

Tables (1)

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 (12)

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

Metrics