Diffraction Gratings Archives

What wavelength was the damage threshold testing performed at for gratings?

10.6 microns

What is the approximate coefficient of thermal expansion (CTE) of our standard grating substrate materials?

Soda Lime glass (float): 9×10-6/degreeC
Annealed Borosilicate (Pyrex): 3×10-6/degreeC
Zerodur: 0.1×10-6/degreeC

What is the tolerance of the groove spacing?

The limit is ±0.5% but most gratings are typically much better.

What are some of the trade-offs in selecting a grating?

Dispersion required and efficiency at peak wavelength are often trade-offs. Coarse gratings, for example, generally have higher peak efficiency but lower dispersion.

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