An imaging system is provided that includes an imager and an optical lens stack with one or more lenses and an electro-optic element positioned between the imager and the lens stack. The electro-optic element includes a first substantially transparent substrate defining first and second surfaces. The second surface includes a first electrically conductive layer. A second substantially transparent substrate defines third and fourth surfaces. The third surface has a second electrically conductive layer. A primary seal is disposed between the first and second substrates. The seal and the first and second substrates define a cavity therebetween. An electro-optic medium is disposed within the cavity. The electro-optic medium is operable between substantially clear and substantially opaque states.

A system includes an optical parametric oscillator (OPO) device. The OPO device has an optical resonator, a first nonlinear optical element (NLO) and a second non-linear optical element (NLO). The first NLO can produce, via OPO of a first pump beam, a first output with a first frequency and a second output with a second frequency. The second frequency is lower than the first frequency. The second NLO can produce, via OPO of a second pump beam (with a higher frequency than the first), a third output with a third frequency and a fourth output with a fourth frequency. The fourth frequency is lower than the third frequency. The first frequency is the same, or at least substantially the same, as the fourth frequency. The OPO device is configured to resonate at the first frequency and the fourth frequency.

An opto-electronic integrated circuit includes an optical splitter (12, 13A, 13B) formed on a substrate, the optical splitter branching an input optical signal into N (N is an integer of 2 or more) optical signals, and outputting the optical signals, and N optical phase modulators (15A-15D) formed on the substrate for the respective optical signals output from the optical splitter, the optical phase modulators adjusting the phases of the optical signals based on a phase modulation characteristic in which the phase change amount changes depending on the wavelength of light, and output the optical signals.

The invention discloses a QD CF substrate and manufacturing method thereof. The manufacturing method uses a patterned photo-resist layer as a masking layer to perform selective quenching on QD layer with a quencher to obtain selectively quenched QD layer, which simplifies QD CF substrate manufacturing process and reduces cost. The QD CF substrate does not use blue QD material in QD layer, but uses blue backlight and organic transparent photo-resist layer to improve light utilization efficiency and reduce material cost. The QD layer is a selectively quenched QD layer, and the portion of the QD layer located above the organic transparent photo-resist layer is quenched by the quencher, and will not emit light when excited by backlight. As such, the invention achieves using the QD material to improve color gamut and brightness, avoid color impurity at blue sub-pixels caused by light mixture, and the manufacturing method is simple.

The invention relates to an acousto-optic deflector comprising a bulk of acousto-optic medium and acoustic wave generator coupled to the bulk, characterised by that the acoustic wave generator comprises at least two different electro-acoustic transducers for generating acoustic waves in the bulk.

An optical receiver includes a cascade of optical filtering elements, each of which selects spectral components from incoming optical signals at a wavelengths aligned to filter passbands. The selected spectral components may be optically combined to form k pairs of intermediary signals, where k=log.sub.2(M). By comparing the k pairs of intermediary signals, k bits of a digital signal representing the incident signal may be generated. The filtering elements may be configured to perform demultiplexing and demodulation simultaneously, increasing functionality and reducing excess losses. The filtering elements may also be tuned so that the optical receiver may be reconfigured to accommodate different combinations of wavelengths and modulation formats, such as wavelength division multiplexed (WDM) on off keying (OOK), M-ary orthogonal formats including frequency shift keying (FSK) and pulse position modulation (PPM), differential phase shift keying, and hybrid combinationsproviding rate and format flexibility and WDM scalability.

A method and a system for scanning a time delay between a first ultrafast optical pulse of duration shorter than 10 ps and a second ultrafast optical pulse of duration shorter than 10 ps, wherein the second ultrafast pulse is submitted to an acousto-optic Bragg diffraction by an acoustic pulse in the bulk of an acousto-optic material and the delay scanning is produced by time variation of the acoustic pulse in the material.

A beam steering apparatus includes a transformation layer, of which a refraction index is changed by light irradiation, a pattern layer arranged on the transformation layer and comprises a plurality of patterns, and a light irradiation unit arranged under the transformation layer. The pattern layer has patterns of a metasurface shape to reflect an external laser. The light irradiation unit may emit light having different characteristics.

A dual function camera is described for infrared and visible light imaging using electrically controlled filters. An example has an image sensor to image visible and infrared light, a lens system to image a scene onto the image sensor, and an electrically activated filter that selectively prevents visible light from the scene from impinging on the image sensor while capturing an infrared image.

A source of femtosecond pulses at center wavelengths of about 940 nm and about 1140 nanometers (nm) includes a mode-locked fiber MOPA delivering pulses having a center wavelength of about 1040 nm. The 1040-nanometer pulses are spectrally spread into a continuum spectrum extending in range between about 900 nm and about 1200 nm and having well defined side-lobes around the 940-nm and 1140-wavelengths. Radiation is spatially selected from these side-lobes and delivered as the 940-nm and 1140-nm pulses.