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Spectrograph with low focal ratio

  • US 5,644,396 A
  • Filed: 06/20/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 06/20/1995
  • Status: Expired due to Fees
First Claim
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1. A spectrograph for analyzing lights of wavelengths of interest, comprising:

  • (a) a first lens unit having at least one lens with at least one aspheric surface for collimating light from a light source, the first lens unit having a positive optical power and having a focal ratio of at most 1.7;

    (b) a reflective diffraction grating for diffracting the collimated light from the first lens unit;

    (c) a light detector; and

    (d) a second lens unit having at least one lens with at least one aspheric surface for focusing the diffracted light on the light detector, the second lens unit having a focal length sufficient to provide an overall magnification of 0.8 to 2.0 on the light detector for said light source.

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