Patent ID: 7583423

Claim:
An optical system for wavelength selection comprising: at least one coherent light source for inputting multiple wavelengths; a first polymer-dispersed liquid crystal switchable holographic component for diffracting a first single wavelength of an incident beam; a second polymer-dispersed liquid crystal switchable holographic component for diffracting a second single wavelength of an incident beam, wherein the first and second polymer-dispersed liquid crystal switchable holographic components are located in stacked relationship with one another and placed in the path of the incident beam; and an output component alternately configured for receiving from the first and second polymer-dispersed liquid crystal holographic: (a) all undiffracted multiple wavelengths; and (b) both the first and second diffracted single wavelengths and the undiffracted multiple wavelengths; wherein the output component is not a polymer-dispersed liquid crystal switchable holographic component.