Diffraction grating-based wavelength selection unit
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United States of America Patent
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Jun 24, 2003
Issued Date -
N/A
app pub date -
Feb 9, 2001
filing date -
Jan 16, 2001
priority date (Note) -
Expired
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Abstract
An optical wavelength selection apparatus containing a surface-relief transmission diffraction grating, a collimating lens for collimating a beam incident to the diffraction grating, and a focusing lens for focusing the beams diffracted by the diffraction grating. The diffraction grating, after having been subjected to a test condition of 85 degrees centigrade and a relative humidity of 85 percent for at least 500 hours, has diffraction efficiency performance within 6 percent of that achieved before being subjected to these test conditions.
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