In a device for generating output laser pulses having a tunable central wavelength, based on parametric amplification, a laser system is to be provided that has less complexity, but that nevertheless provides great tunability for the wavelength, permits rapid switching of the wavelength, and allows the spectral bandwidth of the emitted pulses to be adjusted. This is attained in that for adjustability of the bandwidth of the output laser pulses, an optical device is provided that is designed to influence the spectral phase of the pump pulses as a function of the spectral phase of the seed pulses.

An optical parametric oscillator (OPO) for generating an optical frequency comb is described. The OPO is configured to control cavity dispersion such that the OPO is able to generate extended signal and/or idler spectra in response to a continuous-wave pump. Each spectrum includes multiple modes that are substantially equispaced with substantially the same frequency spacing.

In a device for generating output laser pulses having a tunable central wavelength, based on parametric amplification, a laser system is to be provided that has less complexity, but that nevertheless provides great tunability for the wavelength, permits rapid switching of the wavelength, and allows the spectral bandwidth of the emitted pulses to be adjusted. This is attained in that for adjustability of the bandwidth of the output laser pulses, an optical device is provided that is designed to influence the spectral phase of the pump pulses as a function of the spectral phase of the seed pulses.

A digital light path length modulator comprises an optical path length extender (OPLE) and a polarization modulator. The OPLE comprises two light paths having different path lengths, such that light having a first polarization is directed through a first light path, and the light having a second polarization is directed through a second light path.

An optical apparatus includes first and second mirror devices disposed to oppose each other, each being capable of taking partially reflective state; and an image displaying device disposed between or on one outer side of the first and second mirror devices, and being capable of displaying an image.

A multilayer light diffuser plate and a method for manufacturing the same are disclosed. The multilayer light diffusion plate comprises a main layer and a partially-transmissive and partially-reflective layer located under the main layer. The top surface of the main layer is the light-emitting surface, and the light-incident surface is the bottom surface of the partially-transmissive and partially-reflective layer. The partially-transmissive and partially-reflective layer comprises a plurality of first base material layers and a plurality of second base material layers stacked alternately. The materials of the first and second base material layers have different refractive indices. The partially-transmissive and partially-reflective layer formed by alternately stacking the first and second base material layers with different refractive indices is arranged on the light-incident surface of the light diffuser plate by means of extrusion, which is simpler and less expensive to manufacture.

A reflective optical data modulator includes a layer of optical material, a front partial optical reflector on a major surface of the layer of optical material, a back optical reflector, and at least two electrodes. The back optical reflector is at or near a portion of a second surface of the layer of optical material and faces the front partial optical reflector. The at least two, electrodes are located to enable application of a voltage across a portion of the layer of optical material. The layer of optical material has an optical absorption dependent on the voltage applied across the electrodes. The front partial optical reflector is an unburied layer structure.

In one example, a device includes a bus waveguide to carry a light of a carrier wavelength, a first ring waveguide with a first modulator, a first heater to adjust a resonance wavelength of the first ring waveguide, and a second ring waveguide with a second modulator. The first ring waveguide and the second ring waveguide are coupled to the bus waveguide and are to modulate the light of the carrier wavelength to impart one of at least four optical power levels to the light. In another example, a device includes, a bus waveguide, a first ring waveguide with a first modulator, and a second ring waveguide with a second modulator. The first ring waveguide and the second ring waveguide are coupled to the bus waveguide and are to modulate a light of a carrier wavelength to impart one of at least four optical power levels to the light.

A system to adjust light path length using a digital light path length modulator. The digital light path modulator includes an optical path length extender (OPLE) and a polarization modulator. The OPLE has two light paths having different path lengths, so light with a first polarization is directed through a first light path, and the light with a second polarization is directed through a second light path through the OPLE.

A Faraday rotator includes: a disk-shaped magneto-optical solid-state medium, a magnet generator configured to generate a magnetic field in the magneto-optical solid-state medium, a heat sink with a support surface for the magneto-optical solid-state medium, a reflector mounted between the heat sink and the magneto-optical solid-state medium and configured to reflect a laser beam entering the magneto-optical solid-state medium in a first impingement region on a first side of the magneto-optical solid-state medium facing away from the support surface, and a deflector configured to deflect the laser beam emerging from the magneto-optical solid-state medium back to a second impingement region at least partly overlapping with the first impingement region on the first side. An optical isolator can have at least one such Faraday rotator. A driver laser arrangement can have at least one such optical isolator. An EUV radiation generation apparatus can have such a driver laser arrangement.