155 results about "Optical parametric amplifier" patented technology

The polarization direction of a signal is rotated by a polarization controller so as to be orthogonal to the main axis of a polarizer. A control pulse generator generates control pulses from control source with a wavelength which is different from the wavelength of the signal. The signal and the control pulse are input to a nonlinear optical fiber. In the nonlinear optical fiber, the signal, during the time period in which the signal and the control pulse coincide, has its polarization direction rotated by cross phase modulation, and is amplified by optical parametric amplification. The signal, during the time period in which the signal and the control pulse coincide, passes through the polarizer.

The invention provides a generation device for a continuous variable quantum entanglement state light field. The generation device comprises a single-frequency laser (1), an optical parameter amplifier (2), a Bell state direct detection system (3), a bottom plate (4) and an optical parameter amplifier locking system (5); the used optical components are fixed on the bottom plate (4);the optical parameter amplifier locking system (5) is formed by a scanning unit (11), a locking threshold value setting unit (12), a comparison unit (13) and a locking unit (14), therefore, automatic locking for the optical parameter amplifier is achieved, and problems of bad operability and reliability of the conventional continuous variable quantum entanglement source can be solved. The generation device has the advantages of stability, reliability, simpleness in operation and the like and is applicable to volume production.

A quantum entanglement generating system (30) comprises: a laser light source (1) for producing a light beam of light frequency 2f₀; a ring interferometer (20) comprising a beam splitter (4) into which the light beam of light frequency 2f₀ is incident and a plurality of mirrors (5, 7, 8), the beam splitter and the mirrors forming an optical path in the form of a ring; a parametric amplifier (6) inserted in the optical path of the ring interferometer for producing a beam of light of light frequency f₀ upon receiving the light beam of light frequency 2f₀ incident into the optical parametric amplifier; and a dispersive medium (9) inserted in the optical path of the ring interferometer for varying relative optical path length for the light beam of light frequency 2f₀ and the light beam of light frequency f₀, whereby two light beams of light frequency 2f₀ split into at the beam splitter (4) so as to travel mutually contrariwise in direction of advance in the ring interferometer are incident into the optical parametric amplifier (6) to generate a first and a second squeezed light beam traveling mutually contrariwise in direction of advance in the ring interferometer (20), and the first and second squeezed light beams upon adjustment of their relative phase at a selected value through the dispersive medium (6) are combined in the beam splitter (4) to generate quantum entangled beams (10, 11).

Two-pump optical parametric devices (OPDs), and methods of operating the same, generate desired output signals and idlers having reduced stimulated Raman scattering (SRS) noise levels. When the two-pump OPD is used as a two-pump optical parametric amplifier (OPA), the pumps are polarized perpendicular to each other, and the lower-frequency sideband (signal or idler) is polarized parallel to the lower-frequency pump (perpendicular to the higher-frequency pump). The desired output may be an amplified signal or a generated idler. When the two-pump OPD is used as a two-pump optical frequency converter (OFC), the pumps can be polarized parallel to one another, in which case the signal and idler are both perpendicular to the pumps, or perpendicular to one another, in which case the lower-frequency sideband (signal or idler) is polarized parallel to the lower-frequency pump (perpendicular to the higher-frequency pump).

An optical radiation amplifier, including an input port which receives the optical radiation and a first semiconductor optical amplifier (SOA), which is coupled to receive the optical radiation from the input port and is adapted to amplify the optical radiation to produce amplified optical radiation in response to a first current injected into the first SOA. The amplifier also includes an electro-absorption modulator (EAM), which is coupled to receive the amplified optical radiation and is adapted to modulate the amplified optical radiation in response to a modulation voltage applied to the EAM so as to produce modulated radiation. There is a second SOA, which is coupled to receive the modulated radiation and is adapted to amplify the modulated radiation in response to a second current injected into the second SOA.

The invention provides a continuous variable quantum entanglement source generating device. The device comprises a laser module, a beam split coupling module, a laser reference cavity module, a phase modulator, an optical parametric amplifier locking module, an anti-phase regulating and locking module, an isolator and beam shaping module, an optical parametric amplifier module, a detection system module and a Bell state direct detection system module, wherein the modules are all fixed on each base plate, and after being subjected to sealing treatment, the modules are sequentially fixed at corresponding positions of an entanglement source total base plate, and a polysulfone cover covers nonlinear crystals in the optical parametric amplifier module for heat preservation. The entanglement source generating device is beneficial to improvement of stability, reliability, operability and exchangeability and is easy for productization, mass production, and the like.

Provided is a dispersion-shifted fiber for an optical parametric amplifier. The dispersion-shifted fiber is a silica-based optical fiber and has a large nonlinear coefficient and a small effective area. The dispersion-shifted fiber also reduces a bending loss and a splice loss due to a mode field diameter difference between it and a conventional single mode fiber. For this, the dispersion-shifted fiber comprises a rectangular core with a very small radius and a high refractive index, a depressed inner clad, and an outer clad with a ring. The core and/or the inner clad are/is doped with a heavy metal.

The invention provides a vacuum squeezed type light field generator, which comprises a single-frequency dual-wavelength laser (1), a mold cleaner (2), an optical parametric amplifier (3), a cavity length locking system (4) and a balance homodyne detection system (5); wherein the mold cleaner (2), the optical parametric amplifier (3), the cavity length locking system (4) and the balance homodyne detection system (5) are arranged on an optical base; and the mold cleaner (2) consists of a first lens (6), a half-wave plate (7), a polarization beam splitter (8), a second lens (9), an optical input head (10), a single-mode polarization maintaining fiber (11) and an optical output head (12) arranged on an optical axis in sequence. The invention has the advantages of compact structure, convenient regulation, high stability and high reliability, and has important application value.

A laser array architecture scalable to very high powers by fiber amplifiers, but in which the output wavelength is selectable, and not restricted by the wavelengths usually inherent in the choice of fiber materials. A pump beam at a first frequency is amplified in the fiber amplifier array and is mixed with a secondary beam at a second frequency to yield a frequency difference signal from each of an array of optical parametric amplifiers. A phase detection and correction system maintains the array of outputs from the amplifiers in phase coherency, resulting in a high power output at the desired wavelength. A degenerate form of the architecture is disclosed in an alternate embodiment, and a third embodiment employs dual wavelength fiber amplifiers to obtain an output at a desired difference frequency.

The invention relates to an all-optical dispersion monitor based on an optical parameter amplifier. The all-optical dispersion monitor comprises a semiconductor laser, a coupler, the optical parameter amplifier, an output optical filter and an optical power meter. The semiconductor laser emits low-power continuous detection light. The continuous detection light and signal light are combined through the coupler and are filled into the optical parameter amplifier. The optical parameter amplifier is based on first-order four-wave mixing effect which causes energy to be transferred to detection waves and idle waves from the signal light. The detection waves and the idle waves with exponential gains are output, pass through the output optical filter and are measured by the optical power meter. The invention has the advantages that the response speed is fast, the sensitivity is high, the working waveband is wide, the signal rate and the modulation format are transparent, the monitor can be used for the dispersion monitoring of a WDM system with single channel rate above 100Gb/s, the high-speed photoelectric device and the signal processing circuit are not required during measurement, and the cost of devices is reduced.

The invention relates to an optical parametric amplifying system based on an all-fiber laser. The technical proposal of the invention is that: the optical parametric amplifying system comprises a pumping source, a signal source, a sync generator, an amplifier and a compressor; the signal source triggers the sync generator which controls the pumping source; the signal source and the pumping source are simultaneously accessed to the amplifier which is accessed to the compressor. The invention provides an optical parametric amplifying system based on an all-fiber laser which has the advantages of compact structure, stable performance, good light beam quality, high signal-to-noise ratio and high single-pass gain so as to solve the technical problems of difficulty in maintaining the whole system, low stability, loose structure and easy generation of optical damage in a chirped pulse optical parametric amplifier in the background technology.

The invention provides a device and a method for automatically adjusting classical gain in a continuous variable quantum entanglement source. The device comprises an optical parameter amplifier, a photoelectric detector, a central processing unit and a temperature controller, wherein a working temperature adjustable nonlinear crystal is placed in the optical parameter amplifier; the photoelectric detector converts an optical signal transmitted by the optical parameter amplifier to an electrical signal; the electrical signal is input to the central processing unit by an analog/digital converter; a signal output by the central processing unit is input to the temperature controller by a digital/analog converter; the temperature of the nonlinear crystal is controlled by the temperature controller; and the method for automatically adjusting the classical gain comprises the steps that the photoelectric detector monitors a transmission signal of the optical parameter amplifier, and the working temperature of the nonlinear crystal is adjusted by a detection result, so that a peak-peak value of the transmission signal is maximum, that is the classical gain is maximum. The device solves the problem that the existing continuous variable quantum entanglement source is difficult to operate, and lays a foundation for the device from a laboratory to a market.

A higher intensity eye safe laser is provided for long range target designation or illumination as well as long range eye safe communications by providing a single beam line combination of an optical parametric oscillator and optical parametric amplifier which are used to double the output of the optical parametric oscillator while limiting beam spread to less than 1.2 milliradians assuming a 20 mm clear aperture. The OPO/OPA combination requires no conditioning, isolation or synchronization optics and provides a factor of two improvements in beam quality as compared to an equivalent optical parametric oscillator, with the subject system providing a compact robust configuration. The high conversion is provided by the use of a simple optical parametric oscillator seeding an optical parametric amplifier without double passing the pump pulse in the optical parametric oscillator. Low beam divergence operation is provided with minimum optics in a compact space with the optical parametric oscillator operating at a reduced signal intercavity flux which provides increased damaged threshold margins.

A dual fiber optic amplifier uses a single pump source for two or more optical power amplifiers. The dual fiber optic amplifier includes a pump source that emits light, a pump splitter, a first optical power amplifier and a second optical power amplifier. The pump splitter splits the light emitted by the pump source into two or more portions. The first optical power amplifier includes an optical fiber input, an optical fiber output, and a doped fiber portion, wherein the first portion of light from the splitter is coupled into the optical fiber input of the first optical power amplifier. The second optical power amplifier includes an optical fiber input, an optical fiber output, and a doped fiber portion, wherein the second portion of light emitted from the splitter is coupled into the optical fiber input of the second optical power amplifier.

A pulse light source device for creating fs output pulses, includes a driver source device including a ps laser pulse source for creating a ps laser pulse output, a first beam splitting device for splitting the ps laser pulse output to first and second ps driver pulses, a first spectral broadening device for creating first fs driver pulses by spectrally broadening the first ps driver pulses, an optical parametric amplifier (OPA) device for creating CEP stabilized second fs driver pulses, and for seeding on the basis of the first fs driver pulses and pumping with the second ps driver pulses, wherein the second fs driver pulses include idler pulses of the OPA device, and a second spectral broadening device for creating the fs output pulses, and arranged to be driven on the basis of the second fs driver pulses. Furthermore, a method of creating fs output pulses is described.

The invention relates to a generation device of quantum entanglement among three atomic ensembles, and mainly aims to solve the existing technical problem of probability preparation existed by quantum entanglement among a plurality of atomic ensembles. The invention adopts the technical scheme that the generation device of quantum entanglement among the three atomic ensembles comprises a light source unit, nine acousto-optic modulators, three sets of optical parametric amplifiers, a beam coupling system, the three atomic ensembles, three sets of optical filtering systems and an entanglement measurement system. Under the light writing action of quantum memory, orthogonal component quantum states of three entangled light pulses are mapped into collective spin waves of the three atomic ensembles, and quantum entanglement among the three atomic ensembles is certainly established; then, under the light reading action of quantum memory, the collective spin wave quantum states of the three atomic ensembles are mapped into the orthogonal component quantum states of the three release light pulses, and quantum entanglement among the three atomic ensemble is certainly verified through measuring correlative characteristics of the orthogonal component quantum states of the three release light pulses and the collective spin waves of the three atomic ensembles.

In an optical parametric amplifier of the invention, pumping light which is amplified using a practical optical amplifier such as an EDFA is supplied together with signal light having a wavelength outside the amplification band of the optical amplifier, to a nonlinear optical medium via a multiplexer, to thereby amplify the signal light by an optical parametric amplification effect due to the pumping light in the nonlinear optical medium. As a result, the amplification band of a practical optical amplifier such as an EDFA, can be extended, and the noise characteristics can be improved.

Pulsed, coherent light is generated by optical mixing which takes place inside the resonator of a pulsed laser oscillator. One of the beams to be mixed is generated by the pulsed laser, and the other by a distinct, external laser oscillator. If the light from the external oscillator is modulated, that modulation will be transferred onto the light generated by the optical mixing. This enables modulated light at an expanded range of wavelengths. Using sum frequency generation, light for sodium excitation, such as for a guide star, can be generated with the optimal modulation of spectral and temporal properties. If the type of optical mixing is difference frequency generation, optical parametric amplifiers with improved efficiency and beam quality are enabled.

The present invention discloses a means of the generation of tunable femtosecond pulses from 380 nm to 465 nm near the degenerate point of a 405-nm pumped type-I BBO non-collinearly phase-matched optical parametric amplifier (NOPA). The tunable UV/blue radiation is obtained from sum frequency generation (SFG) between the OPA output and the residual fundamental beam at 810-nm and cascaded second harmonic generation (SHG) of OPA. With a pumping energy of 75 mJ at 405 nm, the optical conversion efficiency from the pump to the tunable SFG is more than 5% and the efficiency of SHG of the OPA is about 2%.