8 results about "Carrier-envelope phase" patented technology

The utility model discloses a carrier envelope phase measuring device of an ultra-short pulse sequence, which comprises an ultra-short pulse light source, a beam splitting unit arranged on one side of the ultra-short pulse light source, a spectrograph arranged on one side of the beam splitting unit far away from the ultra-short pulse light source, a control unit arranged on one side of the beam splitting unit, and the spectrograph connected with the control unit. The control unit is connected with a piezoelectric transducer, and an interference adjusting unit is arranged on one side of the piezoelectric transducer. According to the utility model, high-precision measurement of the ultra-short pulse sequence CEP is realized, optical elements such as the beam splitter, the reflector and the piezoelectric converter are utilized, and the self-adaptive feedback control unit is combined, so that an optical path can be adjusted in real time to maintain the stability of interference fringes, and accurate phase information is obtained through the spectrograph and the CCD detector.

The application discloses an optical frequency comb locking system for eliminating carrier envelope phase shift frequency, and the disclosed system comprises an optical frequency comb, a repetition frequency detector, a carrier envelope phase shift detector, an attenuator, an operational amplifier, a filter, a power divider, a double balanced mixer, a bias voltage and a phase-locked loop; the system extracts the sum and difference frequencies of the repetition frequency and the carrier envelope phase shift frequency of the optical frequency comb, and locks them to each other, so as to realize the carrier envelope phase shift frequency locking to zero frequency, and reduce the difficulty of the optical frequency comb locking. The application solves the problem of high locking difficulty of the traditional optical frequency comb, simplifies the carrier envelope phase shift frequency control, has the feasibility of productization and high integration, has universality, and can be widely applied to different types of optical frequency comb systems.

The application relates to the field of laser technology and discloses a high-harmonic wave and above-threshold ionization synergic regulation method and system, which adopts a fundamental frequency light and multiple auxiliary fields to form a time-space overlapping composite laser field, adjusts the wavelength, intensity, delay time and polarization direction of the auxiliary field, forms a multi-parameter laser field, takes the multi-parameter laser field as a physical action carrier, synchronously collects HHG spectral intensity distribution and ATI electron spectrum data by using a high-sensitivity spectrometer and an electron spectrometer on the basis of the multi-parameter laser field, inputs the data into a Bayesian optimization algorithm, dynamically adjusts laser parameters, obtains an optimal laser parameter combination, adjusts an electron re-collision probability by adjusting laser ellipticity based on the obtained optimal laser parameter combination, controls an electron ionization time and return energy by using a two-color field carrier envelope phase, synchronously optimizes an HHG cutoff frequency and an ATI spectrum peak position, and realizes closed-loop control; and the application realizes synergic regulation of high-harmonic wave generation and above-threshold ionization processes.

The present application relates to the technical field of double optical comb spectrum, and specifically discloses a passive suppression method for relative carrier envelope phase noise in a double optical comb spectrum system, which comprises the following steps: constructing a hardware optical path, generating a double optical comb signal through a common pump unit and a differential dispersion compensation unit, and performing phase matching at a physical level by using a passive optical delay matching unit; inputting the double optical comb signal into a field programmable logic gate array core of a customized system-level chip, executing synchronous acquisition and passive suppression processing of phase noise of the double optical comb signal, and obtaining a suppressed signal. In the actual industrial field measurement process, the present application first completes the basic phase constraint of the double optical comb signal at the physical level through common pumping and optical delay matching, then directly uses the field programmable logic gate array core inside the system-level chip to perform real-time passive noise suppression, and seamlessly hands over to the neural network processor core to execute multi-spectrum interference elimination.

The invention relates to an ultra-short pulse laser spectrum coherent synthesis method based on optical parametric amplification, and belongs to the technical field of ultra-short pulse laser spectrum synthesis. Pulse laser output by an ultra-short pulse laser source is divided into two beams, one beam serves as input signal light after spectrum broadening based on the nonlinear effect, and the other beam serves as output signal light after spectrum broadening based on the nonlinear effect; one light beam is used as pump light after being subjected to frequency multiplication; performing optical parametric amplification on the input signal light and the pump light to generate amplified signal light and idler frequency light with constant carrier envelope phase difference; performing dispersion compensation on the amplified signal light and the idler frequency light to enable the amplified signal light and the idler frequency light to reach a conversion limit pulse width; according to the invention, the technical problems of poor carrier envelope phase stability and difficulty in optical path matching in the aspect of realizing visible / near-infrared band ultra-short pulse laser output by combining optical parametric amplification and spectrum coherent combination in the prior art can be solved by adopting the optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification and spectrum coherent combination integrated optical parametric amplification system.

The invention relates to the technical field of laser, and discloses a higher harmonic and threshold ionization coordinated regulation and control method and system, fundamental frequency light and multiple paths of auxiliary fields are adopted to form a space-time overlapped composite laser field, and a multi-parameter laser field is formed by adjusting the wavelength, intensity, delay time and polarization direction of the auxiliary fields. A multi-parameter laser field is used as a physical action carrier; on the basis of a multi-parameter laser field, a high-sensitivity spectrograph and an electron spectrometer are used for synchronously collecting HHG spectral intensity distribution and ATI electron energy spectrum data, the HHG spectral intensity distribution and the ATI electron energy spectrum data are input into a Bayesian optimization algorithm, laser parameters are dynamically adjusted, and an optimal laser parameter combination is obtained; on the basis of the obtained optimal laser parameter combination, the electron re-collision probability is controlled by adjusting laser elliptic skewness, the electron ionization moment and return energy are regulated and controlled by using a two-color field carrier envelope phase, the HHG cut-off frequency and the ATI energy spectrum peak position are synchronously optimized, and closed-loop control is achieved; according to the invention, cooperative regulation and control of higher harmonic generation and threshold ionization process are realized.

The invention relates to a carrier envelope phase shift frequency control device and method of an optical frequency comb, the device comprises an intracavity loss modulator, an EOM crystal and a reflector, the intracavity loss modulator is used for controlling the polarization state of an optical signal incident from an optical signal source, so that the EOM crystal works at an optimal polarization modulation working point, and the EOM crystal is used for controlling the polarization state of the optical signal incident from the optical signal source; the carrier envelope phase shift frequency of the optical signal is controlled through polarization modulation of the EOM crystal; the reflector reflects the optical signal of which the polarization state is controlled by the intra-cavity loss modulator and the polarization modulation of the EOM crystal, and the reflected optical signal is recovered to the initial polarization state through the EOM crystal and the intra-cavity loss modulator and returns to the optical signal source. Compared with the prior art, the carrier envelope phase shift frequency tuning range can be widened, the modulation bandwidth can be improved, the intra-cavity loss can be reduced, the mode locking threshold can be reduced, self-starting mode locking under high repetition frequency can be realized, a shorter EOM crystal can be allowed to be used to reduce thermal interference, and the frequency locking stability of the whole optical frequency comb system can be effectively improved.

The application discloses a method and device for generating an ultra-short single attosecond pulse, and the method comprises the following steps: generating a few-cycle femtosecond pulse based on a femtosecond laser output module; processing the few-cycle femtosecond pulse based on a generalized double optical gating, and outputting a laser field pulse; focusing the laser field pulse to a reaction cell to ionize the reaction cell gas, and generating an ultra-short single attosecond pulse; the laser field pulse has a front part, a middle part and a tail part, the front part and the tail part are circularly polarized, the middle part is linearly polarized, a gating is formed, the ultra-short single attosecond pulse is generated in the gating, and the width of the gating is less than 1 / 5 of an optical period. The technical scheme provided by the application realizes that near-infrared pulses which are not dependent on carrier envelope phase (CEP) stability generate an ultra-short single attosecond pulse of nearly 50 as.