13results about "Gaseous masers" patented technology

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.

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.

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

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).

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.

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.

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.

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.

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.