29results about "Gaseous masers" patented technology

The invention relates to an atomic vapor cell (2), comprising: a substrate (8) having a window (8a), the substrate (8) preferably being made of silicon, a first and a second optical component (9a, 9b) arranged on opposite sides of the substrate (8), the window (8a) in the substrate (8) together with the optical components (9a, 9b) delimiting an atomic vapor chamber (7). The second optical component (9b) has a reflective surface (12a), preferably made of silicon, configured to reflect pump light propagating within the atomic vapor chamber (7), in particular at least a portion of a laser beam (4) that enters the atomic vapor chamber (7) from the first optical component (9a). The invention also relates to a sensor device (1) comprising such an atomic vapor cell (2).

To provide an atomic oscillator that can be miniaturized and manufactured on-chip while keeping costs down. [Solution] The atomic oscillator 10 detects the light transmitted through the gas cell 8 and the gas cell 8 containing alkali metal atoms to generate an electrical signal S LI A photodetector 9 converts the signal S to a high-frequency oscillator 31 using an FBAR. LI The input is a feedback signal S. FB A control circuit 1 outputs a feedback signal S FB The control circuit 1 further includes a laser light source 6 that outputs modulated light and introduces it into the gas cell 8, and a control circuit 1 further includes a variable capacitor 32 that adjusts the oscillation frequency of the high-frequency oscillator 31, and a high-frequency adjustment signal S tune The frequency converter 41 outputs the signal S output by the high-frequency oscillator 31. OUT The high-frequency adjustment signal S tune The system includes a frequency mixer 42 that mixes the gas with the gas and outputs a signal at a frequency that synchronizes with the resonant frequency of the gas cell 8.

The present invention provides a gas cell having excellent thermal uniformity.　The gas cell contains alkali metal atoms sealed therein. The gas cell includes a body part having at least one opening and a transparent substrate provided at the opening. A thermal conductivity k of the body part is 30 W･m-1･K-1 or more. A product β･k of the thermal conductivity k and a value β, which is obtained by dividing the surface area of the body part by the surface area of the gas cell, is 20 W･m-1･K-1 or more.

Provided are a gas cell having excellent shape stability, a method for manufacturing the gas cell, and a quantum sensor.　The gas cell has alkali metal atoms sealed therein. The gas cell is provided with a main body having at least one opening and a transparent substrate provided in the opening, the main body being an integrally molded product and having a fitting portion into which the transparent substrate is fitted.

One example includes an atomic optical reference system. The system includes an optical system comprising a laser configured to generate an optical beam. The system also includes a vapor cell comprising alkali metal atoms that are stimulated in response to a modulated beam corresponding to an amplitude-modulated version of the optical beam. The system also includes a detection system configured to monitor at least one detection signal corresponding to light emitted from or absorbed by the vapor cell and to generate at least one feedback signal in response to the at least one detection signal. The system further includes a beam modulator configured to amplitude-modulate the optical beam to generate the modulated beam and to frequency shift the optical beam to generate an output beam having a stable frequency in response to the at least one feedback signal.

This magneto-optical trap device comprises: a vacuum container in which atoms to be cooled and captured are enclosed; an optical element which, on the basis of laser supplied from a light source, generates a pair of parallel light beams that travel in mutually opposing directions and are circularly polarized light beams having the same rotational direction of electric field vectors when facing the respective traveling directions; and a diffraction element which has a plurality of dielectric nanostructures arranged in n-fold symmetry (n is an integer of 3 or more) on a plane perpendicular to the traveling directions of the pair of parallel light beams, and emits a diffracted light beam, which is a circularly polarized light beam having a rotational direction opposite to that of the incident parallel light beam, to the side opposite to the incident side at a predetermined diffraction angle for at least one parallel light beam of the pair of parallel light beams, wherein the atoms are cooled and captured in a region in which the pair of parallel light beams and the diffracted light beam overlap inside the vacuum container.

To solve a problem of difficulty in preventing a light shift from occurring to an atomic oscillator.SOLUTION: An atomic oscillator 100 comprises: a light generator 101 which generates two exciting light beams; an alkali metal atomic gas cell 102 which is irradiated with the two exciting light beams having their frequency difference varied; a detection part 103 which detects the quantity of transmitted light transmitted through the alkali metal atomic gas cell; and a control part 104 which measures the resonance frequency of an alkali metal atomic gas based upon the detected quantity of the transmitted light, and controls the intensity ratio of the two exciting light beams irradiating the alkali metal gas cell based upon the measured resonance frequency.SELECTED DRAWING: Figure 12

The present invention provides a gas cell and a quantum sensor that exhibit excellent bonding performance of a bonding part and high reliability in terms of airtightness.　Provided is a gas cell in which alkali metal atoms are encapsulated. The gas cell comprises: a body part that has at least one opening; a transparent substrate that is provided to the opening; and a bonding part that is provided between the body part and the transparent substrate and that bonds the body part and the transparent substrate. The bonding part is constituted by a melt-fixed layer of glass frit and filler which has a thermal expansion coefficient smaller than that of the glass frit. When the thermal expansion coefficient of the transparent substrate is αa, the thermal expansion coefficient of the bonding part is αb, the thermal expansion coefficient of the body part is αc, and (αb / αa)+(αa / αc) is Q, 2.00≤Q≤3.10 is satisfied.

The application provides a Q-switching device for a waveguide CO2 laser, which can improve Q-switching output peak power, output stable and reliable high-quality light beams for a long time, and is beneficial to miniaturization of the laser. The application is suitable for the waveguide CO2 laser, the stroke of the piezoelectric ceramic can be changed between dozens of microns and dozens of millimeters, and the stroke distance is precisely controlled in a closed loop by a ceramic controller, so that the Q-switching is easily realized, the application has a simple structure, does not need to insert a complex Q-switching element in a resonant cavity, the coupling loss of a waveguide port is greatly reduced, and the Q-switching output peak power is improved. The piezoelectric ceramic has the characteristics of high precision, good stability and long service life, so that the stable and reliable high-quality light beams can be output for a long time, the piezoelectric ceramic has a small volume, the overall structure of the laser is more compact, and the miniaturization of the laser is beneficial.

The problem of the present invention is to provide a substrate with high versatility, a method for producing the substrate, and a method for producing a unit cell using the substrate. The problem is solved by providing a substrate comprising a plurality of alkali metal azide spots on a substantially flat surface.

To provide an atomic oscillator utilizing the CPT resonance, the atomic oscillator controlling a wavelength of a laser beam, which is incident to an alkali metal cell, in such a manner that CPT resonance becomes maximum.SOLUTION: An atomic oscillator comprises: a gas cell; a laser beam generation section for generating a laser beam, of which the frequency is modulated by a first modulation signal, and making the generated laser beam incident to the gas cell; a photodetection section which generates a detection signal corresponding to an intensity of the laser beam emitted from the gas cell; a local oscillator for generating a standard signal of which the frequency is controlled in accordance with the detection signal; a high frequency generator for generating the first modulation signal by modulating a phase of the standard signal using a second modulation signal; and a lock-in amplifier for processing the detection signal of the photodetection section using as a reference signal a double-frequency synchronizing signal which is synchronized to the second modulation signal and has a double frequency as high as that of the second modulation signal. The wavelength of the laser beam is controlled in accordance with an output signal of the lock-in amplifier.SELECTED DRAWING: Figure 4

An atomic cooling apparatus according to one aspect of the present disclosure comprises: an optical structure that includes a cold atom generation chamber which cools and captures atoms and an ion pump unit which evacuates the inside of the cold atom generation chamber; a pair of light-incident substrates that are disposed at positions facing each other on outer surfaces of the optical structure and that can cause a pair of parallel light beams which travel in directions opposite to each other and which are circularly polarized light having the same rotation direction relative to the traveling direction to enter the cold atom generation chamber; and a diffraction element, inside the cold atom generation chamber, that diffracts at least one of the pair of parallel light beams to a side opposite to the incident side and that emits, into the cold atom generation chamber, the diffracted light that is circularly polarized light having a rotation direction opposite to that of the parallel light beam having entered, relative to the traveling direction, wherein inside the cold atom generation chamber, atoms are cooled and captured in the region where the pair of parallel light beams and the diffracted light overlap with each other.

What is needed is an optical scheme that provides high collection efficiency while reducing the effects of the vapor cell heating the temperature-sensitive photodetector.SOLUTION: The system for controlling, adjusting or certifying the timepiece includes a means for measuring a frequency signal and / or a rate of the timepiece or several timepieces based on a time reference provided by an optical electronic timepiece 10. Wherein the optical electronic watch comprises an atomic vapor cell 1, the atomic vapor cell comprising a sealed enclosure defining a volume containing a reference atomic vapor, the sealed enclosure comprising an optical inlet 3 allowing transmission of a probe beam adapted to excite an optical transition of the reference atoms and an optical outlet 4 allowing transmission of a fluorescence signal from the reference atoms, the sealed enclosure further comprising a wall 5 transparent to the fluorescence signal and coated on its outside with a coating reflecting the fluorescence signal.SELECTED DRAWING: Figure 5

A sample reservoir (104) containing a sample (118), a nozzle (106), and a heated element (108) are arranged in a vacuum chamber (102). An induction coil (114) is located on the outside of the vacuum chamber (102). The heated element (108) is located around the sample reservoir (104) and the nozzle (106). Electromagnetic power is wirelessly transferred from the induction coil (114) to the heated element (108), whereby the heated element (108) is heated. Heating of the heated element (108) causes the sample reservoir (104) and the nozzle (106) to be heated, whereby the sample (118) in the sample reservoir (104) is heated. An atomic beam generated by the heating of the sample (118) is emitted from the nozzle (106).

The high-temperature cell (116) includes an optical window provided at one end of the high-temperature cell (116) and passing the laser light (132) therethrough, and a right-angle conical mirror (102) provided at the other end of the high-temperature cell (116) and having an opening portion (106) at the apex, reflecting a portion of the laser light (132) incident from the optical window toward the one end outside the opening portion (106). A magnetic field generating device (112) generates a magnetic field at a region where the laser light reflected by the right-angle conical mirror (102) intersects. A magnetic field gradient relaxation module (130) generates a relaxation magnetic field that relaxes the gradient of the magnetic field generated by the magnetic field generating device (112) at the opening portion (106).

This magneto-optical trap device comprises a vacuum vessel in which atoms to be cooled and captured are enclosed, an optical element which, on the basis of laser light supplied from a light source, generates a pair of parallel light beams of circularly polarized light that travel in mutually opposite directions and that have electric field vectors having rotational directions that are the same direction when facing in the respective directions of travel, and a diffraction element which has a plurality of diffractive elements that are arranged with n-fold symmetry (n is an integer of 3 or more) on a plane perpendicular to the directions of travel of the pair of parallel light beams, and which, in response to the incidence of at least one of the pair of parallel light beams, emits diffracted light beams of circularly polarized light having rotation directions that are the opposite directions to those of the incident parallel light beams, and having a prescribed diffraction angle, and the atoms are cooled and captured in a region inside the vacuum container in which the pair of parallel light beams and the diffracted light beams overlap.

The atomic electronic state separator (1) of the present invention includes: an atomic supply unit (11), an atomic movement path (12), a probe laser source (13), and a magnetic field generating unit (M). The atomic supply unit (11) supplies atoms that move in the atomic movement path (12) at a certain speed. The probe laser source (13) supplies a probe laser that propagates coaxially with the atomic movement path (12) in a direction opposite to or the same as the direction of atomic movement. The magnetic field generating unit (M) generates a magnetic field orthogonal to the atomic movement path (12) in the atomic movement path (12) and mixes it with the wave function of the electronic state that allows electric dipole transitions, thereby enabling pulse excitation of clock transitions based on the same probe laser in time and space. Alternatively, a magnetic shielding member can pulse excite clock transitions by shielding the magnetic field applied in the atomic movement path (12) and spatially changing the Zeeman frequency shift, thereby enabling pulse excitation of clock transitions by the same probe laser in time and space. As a result, it is possible to continuously perform spectral analysis of atomic transitions and frequency control of the detection laser, thereby improving the stability of the atomic clock.

An atomic oscillator (10) comprises: a gas cell (8) in which alkali metal atoms are sealed; a photodetector (9) which detects light transmitted through the gas cell (8) and converts the light into an electric signal (SLI); a control circuit (1) which includes a high-frequency oscillator (31) using an FBAR, inputs the signal (SLI), and outputs a feedback signal (SFB); and a laser light source (6) which outputs light modulated by the feedback signal (SFB) and introduces the light into the gas cell (8). The control circuit (1) further comprises a variable capacitor (32) that adjusts the oscillation frequency of the high-frequency oscillator (31), a frequency converter (41) that outputs a high-frequency adjustment signal (Stune), and a frequency mixer (42) that mixes a signal (SOUT) output by the high-frequency oscillator (31) with the high-frequency adjustment signal (Stune) and outputs a signal having a frequency with which the resonance frequency of the gas cell (8) is synchronized.

A spectroscopic device 1 comprises: a first atomic movement path 11 that is provided with an atom supply unit 10; a second atomic movement path 12 that, at a finite angle, intersects the first atomic movement path 11 at a first intersection position P1; a third atomic movement path 13 that, at a finite angle, intersects the second atomic movement path 12 at a second intersection position P2; and a clock laser light source 20 that supplies a clock laser L20 which propagates in a direction opposite to or the same as that of the movement of atoms on the second atomic movement path 12. A spectroscopic region SP where the clock laser L20 causes excitation of clock transition in atoms is formed between the first intersection position P1 and the second intersection position P2 on the second atomic movement path 12.

To reduce individual differences in the oscillation frequency of standard oscillators used for communications. [Solution] The communication standard oscillator 1 comprises a gas cell 13 filled with alkali metal atoms and buffer gas, a photodetector 15 that detects laser light transmitted through the gas cell, a high-frequency oscillator 17 that generates a high-frequency signal, a signal processing unit 20 that generates a modulated high-frequency signal by synchronously detecting the photodetection signal from the photodetector and modulating the high-frequency signal, a laser light source 11 that emits laser light modulated by the modulated high-frequency signal into the gas cell, a memory 31 that stores a predetermined multiplication ratio, and a frequency multiplier 33 that multiplies the frequency of the high-frequency signal generated by the high-frequency oscillator by the multiplication ratio stored in the memory and outputs it as a reference frequency signal. The multiplication ratio stored in the memory is a device-specific value determined by measuring the difference between the oscillation frequency generated in the high-frequency oscillator due to fluctuations in the partial pressure of the buffer gas, which differ for each individual gas cell, and a desired communication reference frequency.

According to the present invention, atoms are trapped by means of a quadrupole magnetic field formed by ring-shaped magnets (106), (108) and three sets of laser beam pairs. A portion of the laser beam pairs LZ is partially blocked by the ring-shaped magnets (106), (108), so that a region (114) which is a non-atom trap space is formed inside a intersecting region (112) where the three groups of laser beam pairs cross. The inside of the intersecting region (112) is irradiated with a laser beam (118) so that atoms within the non-atom catch space are extracted from intersecting region (112).

The present invention addresses the problem of providing: a gas cell having high airtightness; and a quantum sensor provided with the gas cell.　A gas cell according to the present invention has alkali metal atoms sealed therein, and has a body having at least one opening, and a transparent substrate provided to the opening. The body is provided with a fitting part to which the transparent substrate is fitted.

The invention discloses a tube wall cooling structure of an optical pump terahertz laser, and belongs to the technical field of optical pump terahertz lasers, and the tube wall cooling structure comprises a cooling fan, an aluminum alloy fixing plate, cooling fins, a semiconductor chilling plate and a laser tube cooling clamp. The zero load of a single module can reach-10 DEG C when the environment is 25 DEG C, the power supply voltage is 24VDC, the maximum power is 120W, and the maximum refrigerating capacity is 80W. According to the terahertz gas laser, the problem that the temperature of the tube wall of the laser changes slowly is solved, the influence of the temperature change of the tube wall on the power and frequency stability of the laser when the terahertz gas laser works is reduced, the whole system is small in size and compact in structure, a large-size and heavy-weight water cooling machine is not needed, and integration and miniaturization development of the terahertz gas laser is facilitated.

The invention discloses a device for generating an orbital angular momentum-adjustable broadband terahertz vortex beam, and the device comprises a vacuum target chamber which is used for providing a vacuum environment for the interaction of laser and a substance; the laser system is used for providing driving light pulses; the gas target generation device is arranged in the vacuum target chamber, provides a plasma channel along the propagation direction of the driving light pulse, guides the driving light pulse to be transmitted in the plasma channel and generates a broadband terahertz vortex light beam; the light path adjusting element is used for adjusting the position and angle of the driving light pulse when the driving light pulse enters the plasma channel, so that the driving light pulse is transmitted in the plasma channel along a spiral linear track after entering the plasma channel, and then the transverse net current is driven on each section of the plasma channel; and broadband terahertz radiation is generated at different positions of a spiral linear track in the plasma channel, so that a broadband terahertz vortex beam with adjustable orbital angular momentum is formed. The device obtains the broadband terahertz vortex beam with the adjustable orbital angular momentum.

A standard oscillator (1) for communication comprises: a photodetector (15) that detects laser light transmitted through a gas cell (13); a high-frequency oscillator (17) that generates a high-frequency signal; a signal processing unit (20) that synchronously detects a light detection signal from the photodetector and generates a modulated high-frequency signal; a laser light source (11) that emits the laser light modulated by the modulated high-frequency signal to a gas cell; a memory 31; and a frequency multiplier (33) that performs frequency-multiplication on the high-frequency signal by a multiplication ratio stored in the memory, and outputs the frequency-multiplied signal as a reference frequency signal. The multiplication ratio is a device-specific value determined by actually measuring the difference between an oscillation frequency generated in the high-frequency oscillator and a desired reference frequency for communication.

It is difficult to further improve the stability of the resonance frequency against magnetic field fluctuations in atomic oscillators. [Solution] The atomic oscillator of the present disclosure comprises two gas cells, each containing alkali metal atoms and having bias magnetic fields applied in opposite directions to each other; a light generating unit that irradiates the two gas cells with light having at least two different frequency components; a light detection unit that detects the transmitted light that has passed through the two gas cells; and a control unit that determines a resonance frequency based on detection signals corresponding to the transmitted light detected from the two gas cells and controls the oscillation frequency of an oscillation signal output to the outside based on the determined resonance frequency.

The invention relates to an atomic vapor cell (2), comprising: a substrate (8) having a window (8a), the substrate (8) preferably being made of silicon, a first and a second optical component (9a, 9b) arranged on opposite sides of the substrate (8), the window (8a) in the substrate (8) together with the optical components (9a, 9b) delimiting an atomic vapor chamber (7). The second optical component (9b) has a reflective surface (12a), preferably made of silicon, configured to reflect pump light propagating within the atomic vapor chamber (7), in particular at least a portion of a laser beam (4) that enters the atomic vapor chamber (7) from the first optical component (9a). The invention also relates to a sensor device (1) comprising such an atomic vapor cell (2).

This invention proposes a system and method for generating ultra-intense broadband terahertz waves using a structured, diffraction-free, chirped femtosecond laser. In the system, a first femtosecond laser emitted by a femtosecond laser is split by a beam splitter to obtain a pump beam and a probe beam. An optical parametric amplifier modulates the pump beam into a second femtosecond laser, which, after passing through a laser pulse shaper, outputs a chirped-modulated third femtosecond laser. A reflective spatial light modulator converts and reflects the incident third femtosecond laser, and the reflected fourth femtosecond laser is reflected by a second mirror to a first off-axis parabolic mirror. After focusing, it is incident on a BBO crystal, converting part of the light into a second harmonic wave. The remaining light from the fourth femtosecond laser, along with the second harmonic wave, is focused into air, generating air plasma. The air plasma radiates terahertz waves. These terahertz waves are incident on a second off-axis parabolic mirror and reflected as collimated terahertz waves. This invention generates ultra-intense broadband terahertz waves with flexible spectral polarization control.

A computer-assisted method for the dimensioning of a magnetron cavity for an atomic clock, in particular for a hydrogen maser, the cavity being substantially cylindrical and including at least two curved electrodes disposed along a circular arc and delimiting a substantially cylindrical space of predetermined radius r, the cavity also including a substantially cylindrical storage bulb of radius rB disposed in said space such that there is a radial interstice ei between the at least two electrodes and the storage bulb.