摘要:
A tunable parametric mixer comprising a pump laser, a nonlinear waveguide, and a refractive index tuner. The pump laser is configured to generate pump photons. The nonlinear waveguide comprises a cladding and a core. The core is made of nonlinear optical material and the cladding in made of a material with a tunable index of refraction. The nonlinear waveguide is configured to convert the pump photons into signal and idler photons. The refractive index tuner is configured to change the refractive index of the cladding to dynamically tune the dispersion properties of the nonlinear waveguide in order to alter a spectral location of a gain band of the parametric mixer.
摘要:
A waveguide includes an array of p-i-n junctions formed by ions implanted into the waveguide. The p-i-n junctions concentrate electric fields applied on the waveguide to convert the third order susceptibility χ(3) into the second order susceptibility χ(2) and induce the DC Kerr effect. The periodic electrical fields concentrated by the p-i-n junctions effectively create a wave vector, which together with the wave vectors of optical beams in the waveguide satisfies phase matching conditions for nonlinear optical effects. The phase matching can significantly enhance the efficiency of the nonlinear optical effects, such as second harmonic generation, sum frequency generation, difference frequency generation, and four-wave mixing. Waveguides with arrays of PIN junctions can also be used in phase modulators, amplitude modulators, and filters.
摘要:
The invention is directed to the provision of an optical device in which provisions are made to form a gap between an optical waveguide and a substrate without having to form a groove or the like in the substrate and to prevent any stress from being applied to an optical element even when it is heated by a heater for temperature adjustment. More specifically, the invention provides an optical device includes a substrate, an optical element with an optical waveguide formed in a surface thereof that faces the substrate, bonding portions formed on the substrate at positions that oppose each other across the optical waveguide, a heater, formed on at least one of the optical element and the substrate, for heating the optical waveguide, and a micro bump structure formed from a metallic material, wherein the optical element is bonded to the bonding portions via the micro bump structure in such a manner that a gap is formed between the optical waveguide and the substrate.
摘要:
An object of the present invention is to provide a laser light source that includes a laser element and an optical element that are optically coupled efficiently and directly. A laser light source includes, a laser element which has a ridge part and emits laser light from a light emission part, an optical element which has a waveguide for guiding the laser light that is incident on an incidence part; and a substrate for joining the laser element and the optical element close so as to be optically coupled directly, and, in this laser light source, the laser element and the optical element are joined to the substrate in a state in which a position of the incidence part is shifted a predetermined distance upward or downward with respect to a position of the light emission part.
摘要:
A frequency comb article includes: an oscillator to produce an oscillator frequency comb that includes: a first power; and a first optical bandwidth; a fiber amplifier to receive the oscillator frequency comb from the oscillator and to produce an amplifier frequency comb based on the oscillator frequency comb, the amplifier frequency comb includes: a second power that is greater than the first power; and a second optical bandwidth that is greater than the first optical bandwidth; a nonlinear fiber to receive the amplifier frequency comb from the fiber amplifier and to produce a spectrally broadened frequency comb based on the amplifier frequency comb, the spectrally broadened frequency comb including a third optical bandwidth that is greater than the second optical bandwidth; a frequency doubler to receive the spectrally broadened frequency comb from the nonlinear fiber and to provide a doubled frequency comb including: a plurality of fundamental frequencies from the spectrally broadened frequency comb; and a plurality of doubled frequencies, based on the plurality of fundamental frequencies; and an interferometer to receive the doubled frequency comb from frequency doubler and to provide a signal frequency comb based on the doubled frequency comb, the signal frequency comb including the plurality of doubled frequencies that is temporally overlapped and spatially overlapped with the plurality of fundamental frequencies, the fiber amplifier and the nonlinear fiber include a polarization maintaining fiber, and the oscillator, frequency doubler, and interferometer are entirely polarization maintaining.
摘要:
Because a laser device is constructed in such a way that the laser device includes a solid-state laser element 3 that has gains for plural different wavelengths in plural different axial directions, and an optical element that has a characteristic of making an optical loss increase with increase in light intensity for each of light beams with the wavelengths, and the solid-state laser element 3 and the optical element are constructed in such a way as to be included in a resonator for fundamental waves which are generated by the solid-state laser element 3, and the laser device oscillates at two or more wavelengths, outputted light beams with the plural different wavelengths can be acquired by using the single solid-state laser element 3. As a result, a small, cheap, and easy to produce laser device can be acquired.
摘要:
In order to create a stable non-linear optical effect with high efficiency for a plurality of input lights having different wavelengths, according to a first aspect of the present invention, provided is a wavelength conversion apparatus comprising an input section into which input light is input; a wavelength converting section that includes a polarity inverting structure whose polarity inverts periodically and that, in response to the input of light having a wavelength corresponding to the period with which the polarity inverts, converts the wavelength of the light; and a direction changing section that changes a progression direction in which the input light passes through the polarity inverting structure, according to the wavelength of the input light, without changing relative positions of the input section and the polarity inverting structure. Also provided are a light source apparatus and a wavelength converting method.
摘要:
The invention is directed to the provision of an optical device in which provisions are made to form a gap between an optical waveguide and a substrate without having to form a groove or the like in the substrate and to prevent any stress from being applied to an optical element even when it is heated by a heater for temperature adjustment. More specifically, the invention provides an optical device includes a substrate, an optical element with an optical waveguide formed in a surface thereof that faces the substrate, bonding portions formed on the substrate at positions that oppose each other across the optical waveguide, a heater, formed on at least one of the optical element and the substrate, for heating the optical waveguide, and a micro bump structure formed from a metallic material, wherein the optical element is bonded to the bonding portions via the micro bump structure in such a manner that a gap is formed between the optical waveguide and the substrate.
摘要:
An optical wavelength conversion element includes: a wavelength conversion waveguide that has a periodic polarization reversal structure having alternately and cyclically formed domains of which polarization directions are inverted, that guides light as a fundamental wave corresponding to the periodic polarization reversal structure, and performs a wavelength conversion of the guided fundamental wave; a first clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains; a second clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains such that the second clad is opposed to the first clad film; a first conducting unit that electrically connects the domains in parallel via the first clad; and a second conducting unit that electrically connects the domains in parallel via the second clad.
摘要:
A light source apparatus with modulation function has a wavelength conversion module (75) composed of a nonlinear optical material with a structure having a nonlinear constant modulated periodically. It outputs a difference frequency or sum frequency produced by multiplexing pumping light from semiconductor laser light sources (71) and (72) with different wavelengths through a WDM coupler (74) and by launching the multiplexed light into the optical waveguide. The semiconductor laser light source (72) includes a diffraction grating. The semiconductor laser light source (71) includes a section for modulating output light emitted from its semiconductor laser, and is connected to an external FBG (73) which has a reflection band narrower than a resonance wavelength spacing determined by the device length of the semiconductor laser. The FBG (73) is supplied with the modulated output.