Claims
- 1. A random access monochromatic illuminator apparatus comprising:
- a first entrance slit for admitting a light beam from a source;
- a first optical means for collimating said beam of light, said first optical means comprising a first parabolic reflector means;
- a grating for defracting said beam of light;
- a second optical means for focusing the defracted beam of light to an exit, said second optical means comprising a second parabolic reflector means; and
- a scanning means for scanning said defracted beam of light from said grating, said scanning means comprising a rotatable mirror located between said grating and said first or second parabolic reflector means,
- wherein the path of said beam of light is folded, and is coaxial and off-axis with respect to said first and second parabolic reflector means, such that the optical aberrations of said first parabolic reflector means are substantially canceled by said second parabolic reflector means.
- 2. The apparatus of claim 1 wherein said parabolic reflector means comprise mirrors that have a parabolic cross-section in a first axis and a spherical cross-section in second axis perpendicular to said first axis.
Parent Case Info
This application is a continuation of provisional application Ser. No. 60/026,627, filed on Sep. 24, 1996.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
37 34 588 |
Jun 1992 |
DEX |
Non-Patent Literature Citations (1)
Entry |
"Coma Canceling Monochromator with No Slit Mismatch" by V.L. Chupp and P.C. Grantz vol. 8, No. 5 --Applied Optics --May, 1969. |