A device for generating individual photons with energy E includes quantum emitters, having at least one determined transition with the energy E from an energy level N* to a lower energy level N1. The emitters are near a propagation path running from first to second regions. The device also includes at least one light source to output light, for propagation along the path. The light has the energy E for resonant excitation of the energy level N*. The emitters are arranged so that optionally exactly Z emitters are illuminated, forming an optical thickness τ>0 for the light along the path. The number Z lies in a range of Z0±10% and Z0 is a number at which a maximum destructive interference in the second region occurs between a two-photon component of the light scattered on the ZO emitters and a two-photon component of the non-scattered light.

A compound strontium fluoroborate, nonlinear optical crystal of strontium fluoroborate, preparation method thereof; the chemical formula of the compound is SrB5O7F3, its molecular weight is 310.67, and it is prepared by solid-state reaction; the chemical formula of the crystal is SrB5O7F3, its molecular weight is 310.67, the crystal is of the orthorhombic series, the space group is Ccm21, and the crystal cell parameters are=10.016(6) Å, b=8.654(6)(4) Å, c=8.103(5) Å, Z=4, and V=702.4(8) Å3. A SrB5O7F3 nonlinear optical crystal has uses in the preparation of a harmonic light output when doubling, tripling, quadrupling, quintupling, or sextupling the frequency of a 1064-nm fundamental-frequency light outputted by a Nd:YAG laser, or the generation of a deep-ultraviolet frequency doubling light output lower than 200 nm, or in the preparation of a frequency multiplier, upper or lower frequency converter, or an optical parametric oscillator.

A nonlinear crystal grating assembly including two integral nonlinear crystal grating structures having inverted crystal axes and having parallel spaced-apart mesas with predetermined mesa widths arranged such that, when assembled in an interdigitated configuration, the mesas of the two grating structures form an alternating grating pattern that is aligned with a propagation direction of input light, thereby creating a periodic structure for quasi-phase-matching (QPM). The nonlinear crystal grating structures are formed using strontium tetraborate, lithium triborate or another nonlinear crystal material. The nonlinear crystal grating assembly is utilized in a laser assembly in which fundamental wavelengths are doubled and/or summed using intermediate frequency conversion stages, and then a final frequency converting stage utilizes the nonlinear crystal grating assembly to double or sum one or more intermediate light beam frequencies to generate laser output light at high power and photon energy levels. A method and inspection system are also described.

According to an example aspect of the present invention, there is provided an electro-optic plasmonic device comprising: a slot waveguide that is defined by a first metallic electrode, a second metallic electrode and dielectric material in a slot between the first and second metallic electrodes. The device is configured to utilize the electric field induced Pockels effect.

According to an example aspect of the present invention, there is provided an electro-optic plasmonic device comprising: a slot waveguide that is defined by a first metallic electrode, a second metallic electrode and dielectric material in a slot between the first and second metallic electrodes. The device is configured to utilize the electric field induced Pockels effect.

This invention provides a pulse shaping technique that can yield a pulsed laser having a smaller energy fluctuation than that of a conventional pulse shaping technique using one or two non-linear optical crystals. A pulse shaping device includes: a non-linear optical crystal group including at least three non-linear optical crystals arranged side by side on an optical path of an input pulsed laser.

A portable sanitization system may comprise: a portable device; a light source disposed in the portable device, the light source configured to emit a light having a wavelength between 414 and 474 nm; a light converter comprising a nonlinear crystal configured for frequency doubling; and a light guide extending from the light source to the light converter, the light converter disposed proximal a tip of the light guide.

A method for providing a detection-signal for objects to be detected—at least a first and second light-beam including different frequencies being generated with a first optical non-linear 3-wave-process from a light-beam of a light-source including an output-frequency, and the first light-beam including a reference-frequency being detected, and the second light-beam including an object-frequency being emitted and received after reflection on an object, and the light-beam including the output-frequency and the second light-beam including the object-frequency being superposed, and a reference-beam including a reference-frequency being generated with a second optical non-linear 3-wave-process from the two superposed light-beams including the output-frequency and including the object-frequency, and a detection-signal being generated so that the object-distance is determinable due to the aforementioned superposition based on the time-difference between the detection of the first light-beam including the reference-frequency and a detection of a change of the reference-beam including the reference-frequency.

The present invention provides a method for fabricating KTP nonlinear racetrack micro-ring resonator, composed of six steps: KTP wafer processing, ion implantation, electron beam exposure, subsequent processing, reactive ion etching and final processing. A thin-film waveguide structure similar to the on-insulator lithium niobate thin-film can be achieved through only one process of ion implantation, which enables significantly simplified procedure, shortened time, and reduced cost. Meanwhile, the KTP micro-ring resonator produced according to the present invention has an optical damage threshold several times higher than the existing lithium niobate micro-ring resonator. It can output nonlinear frequency converted light to the power of milliwatts, and suitable for the case where both the input and output optical signals are pulsed lasers. Since Ion implantation, electron beam exposure, metal evaporation deposition, and reactive ion etching are all relatively developed micro-nano machining technologies, the present invention has wonderful operability and repeatability.

A compact laser source and a single sideband modulator used therein is disclosed. The compact laser source includes a seed laser and one or more channels, with each channel generating one or more output laser beams having corresponding different wavelengths. The compact laser source can be formed in whole or in part on a single optical motherboard to thereby minimize space and power requirements. By employing the disclosed single sideband modulator, harmonics in the generated output laser beams can be minimized. The compact laser source finds application in an atom interferometer (AI) system, which may be used to measure gravity, acceleration, or rotation of the AI system.