An optical device for wavelength monitoring and wavelength control. The optical device has an optical element having a first surface and a second surface not parallel to each other. The optical element separates a light beam supplied to the first surface into a first beam reflected on the first surface,...http://www.google.de/patents/US5896201?utm_source=gb-gplus-sharePatent US5896201 - Optical device for wavelength monitoring and wavelength control
