From Ondax, Inc.

We present a power stabilization method for a dual-mode Ti:Sapphire ring cavity laser. Without stabilization, mode competition caused the output power of the two modes to fluctuate by approximately 10 dB. The power stabilization system, which used volume holographic gratings to monitor the power in each mode, reduced the power flucuations to less than 3 dB.

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Diffraction Gratings
A diffraction grating uses a substrate with parallel grooves to disperse light into its spectra. Eschelles are included in this area.

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