88 results about "Carrier-envelope phase" patented technology

The application provides a low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency. The low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency comprises an optical path structure and a circuit structure, wherein the optical path structure comprises an oscillator, an acousto-optic frequency shifter, an optical fiber amplifier, a pulse compressor, an optical fiber spread spectrum device and a coherent heterodyne beat device; and the circuit structure comprises a feed-forward circuit control phase device and a phase-locked loop circuit control repetition frequency device. The fiber laser oscillator can ensure long-time operation of a system, so that the stability of the system is superior to that of a system adopting a solid laser oscillator; through the technologies of optimizing intracavity net dispersion of the fiber oscillator, introducing an inner cavity modulator in the oscillator, adopting the feed-forward acousto-optic frequency shifter, and the like, the low noise fiber laser frequency combs device can be realized; and meanwhile, due to the application of the acousto-optic frequency shifter, the carrier envelope phase shift frequency of the optical frequency combs can be accurately regulated, so that the optical frequency combs device with precise phase position regulation and secular stability is provided for realizing applications such as optical frequency standard, attosecond science and non-linear optics.

Disclosed is a system and method for stabilizing the carrier-envelope phase of the pulses emitted by a femtosecond mode-locked laser by using the powerful tools of frequency-domain laser stabilization. Control of the pulse-to-pulse carrier-envelope phases was confirmed using temporal cross correlation. This phase stabilization locks the absolute frequencies emitted by the laser, which is used to perform absolute optical frequency measurements that were directly referenced to a stable microwave clock.

Feedback loops can be used to shift and stabilize the carrier-envelope phase of a frequency comb from a mode-locked fibers laser or other optical source. Compared to other frequency shifting and stabilization techniques, feedback-based techniques provide a wideband closed-loop servo bandwidth without optical filtering, beam pointing errors, or group velocity dispersion. It also enables phase locking to a stable reference, such as a Ti:Sapphire laser, continuous-wave microwave or optical source, or self-referencing interferometer, e.g., to within 200 mrad rms from DC to 5 MHz. In addition, stabilized frequency combs can be coherently combined with other stable signals, including other stabilized frequency combs, to synthesize optical pulse trains with pulse durations of as little as a single optical cycle. Such a coherent combination can be achieved via orthogonal control, using balanced optical cross-correlation for timing stabilization and balanced homodyne detection for phase stabilization.

The present invention relates to an all-fiber continuous light and optical frequency comb locking device which comprises an optical frequency comb, a continuous laser, a beat frequency apparatus, a frequency shift apparatus, a reference signal source, a frequency synthesizer and a fast phase-locked loop circuit. The optical frequency comb can ensure system long-time stable operation, and repetition frequency and carrier-envelope phase shift frequency of the optical frequency comb are locked to a stable reference signal source; the continuous laser can be an external cavity semiconductor laser or a continuous optical fiber laser, and is used for locking continuous light to some comb tooth of the precision optical frequency comb; and input and output terminals of the frequency shift apparatus and the beat frequency apparatus are connected by using polarization maintaining optical fiber, and the frequency shift apparatus and the beat frequency apparatus are used for assisting completely overlapped locking of the continuous light and the optical frequency comb. The all-fiber continuous light and optical frequency comb locking device has a compact and small structure; the beat frequency structure is simple and easy, and the signal to noise ratio is high; locking is good in stability and high in precision; and the continuous light can be ensured to be completely overlapped with some comb tooth of the optical frequency comb, so that completely overlapped locking can be achieved.

The invention discloses a method and device for monitoring and controlling a high-precision optical fiber optical frequency comb. The method and device are used for monitoring and controlling working conditions of links of the optical fiber optical frequency comb and improving the long-term stability, the operation reliability and the product replicability of the optical fiber optical frequency comb. By means of the device, pulse carrier-envelope phases output by an optical fiber laser oscillator and optical fiber amplifiers in all stages are monitored, transmission and fluctuation of laser phase noise in the power amplification process are observed and controlled, carrier-envelope phase output signals of the main amplifier are negatively fed back to a carrier-envelope phase control unit in the laser oscillator, namely an electronic control polarization controller modulates the pulse polarization evolution process or modulates the pump light strength of the laser oscillator, and stable control over the carrier-envelope phases is achieved. By means of the method and device, the working conditions of the laser oscillator and the amplifiers in all stages can be monitored and controlled in real time, monitoring indexes are timely and comprehensive, and a stable and reliable feedback mechanism is provided.

The invention discloses a method and device for measuring the light frequency through a high-power optical fiber optics frequency comb. A mode locking pulse laser serves as an optics frequency comb seed resource to set up the high-power optical fiber optics frequency comb, and a carrier envelope phase signal of the optics frequency comb is locked at the zero frequency; the beat frequency is carried out on the output light of the optics frequency comb and continuous lasers to be tested, the repeated frequencies of the pulse of the optics frequency comb seed resource are finely adjusted through an externally loaded modulation signal, a plurality of sets of beat frequency signals corresponding to different repeated frequencies are obtained, and therefore the accurate measuring of the frequency of the continuous lasers to be tested can be achieved. The method and device have the advantages that the device is stable in structure, the measuring process is easy, and the application is flexible.

The invention relates to a high-power laser pulse carrier envelope phase locking method, belonging to the technical field of the ultrafast laser science and the precision measurement. The high-power laser pulse carrier envelope phase locking method adopts the double laser path interference technology of the self-reference measurement method to obtain the beat frequency signal which is fed back to a control laser through a phase locking circuit. The high-power laser pulse carrier envelope phase locking method is used for arranging a laser amplifying system in one branch of laser path used for generating the frequency doubled laser so as to amplify the frequency doubled laser at high power in the double laser path interference technology. The high-power laser pulse carrier envelope phase locking method has the advantage that the high-power laser can be output by keeping the carrier envelope phase stable. Compared with original method in which the amplification is carried out first and then the carrier phase is measured by using an f-2f system. The method adopting the phase locking circuit feedback to control the laser is more stable and practical and can obtain the beat frequency signal to noise ratio of higher than 40dB and ensure more stable high-power laser pulse carrier phase, longer working time and high output power.

A chirped pulse amplification laser system. The system generally comprises a laser source, a pulse modification apparatus including first and second pulse modification elements separated by a separation distance, a positioning element, a measurement device, and a feedback controller. The laser source is operable to generate a laser pulse and the pulse modification apparatus operable to modify at least a portion of the laser pulse. The positioning element is operable to reposition at least a portion of the pulse modification apparatus to vary the separation distance. The measurement device is operable to measure the carrier envelope phase of the generated laser pulse and the feedback controller is operable to control the positioning element based on the measured carrier envelope phase to vary the separation distance of the pulse modification elements and control the carrier envelope phase of laser pulses generated by the laser source.

The invention relates to a self-adaptive double-light-comb spectrum system. The system includes two pulse lasers, one or two continuous lasers, and optical beat frequency modules which are used for detecting beat frequency signals generated from any combination of the pulse lasers and the continuous lasers. One path of the beat frequency signals are directly sent to a circuit processing module, and the other path passes through filters for smoothing and is sent to frequency counting. The counted number is compared with a set value. A control signal is output to a frequency slow feedback module. Working parameters of the continuous lasers are adjusted to enable the obtained beat frequency signals to work in a defined range. The circuit processing module carries out circuit treatment including smoothing, frequency mixing, and frequency doubling on the beat frequency signals in order to extract a compensating signal representing double-light-comb repetition frequency and carrier envelope phase jitter. Frequency counting and slow feedback are adopted to control drift of the beat frequency signals of pulsed light and continuous light in self-adaptive double-light-comb spectrum measurement to be in a certain frequency range. It is ensured that the beat frequency signals can stably exist for a long time, thereby improving stability of the self-adaptive double-light-comb spectrum system.

The invention relates to a wideband optical parametric chirped pulse amplification (OPCPA) laser system with a stable carrier envelope phase. The laser system comprises a femtosecond laser device with an output wavelength of 1550nm, a spectroscope, a signal light generator, a stretcher, an angular disperser, a photonic crystal fiber frequency converter, a regenerative amplifier, multi-level Nd: yttrium aluminum garnet (YAG) amplifier, a reflection mirror, an optical parametric amplifier and a compressor. The wideband optical parametric chirped pulse amplification laser system is characterized in that a wideband signal light generated by difference frequency action has a high circular error probable (CEP) stability and a tunable characteristic of the wideband; the signal light and pump light are from the same laser device; under a condition of ignoring the environment jitter influence, the high-precision time synchronization with 10-femtosecond between a signal light pulse and a pump light pulse can be ensured, and the invention has a good frequency stabilization effect; OPCPA of the wideband is realized by means of the angular disperser, and an intermediate infrared tunable laser source is obtained.

The invention relates to an extreme ultraviolet attosecond pulse width measurement method and device. The method comprises the following steps: 1, adjusting double arms of a Mach-Zehnder interferometer so as to realize collinear transmission of superstrong femtosecond pulses locked by extreme ultraviolet attosecond pulses to be detected and carrier envelope phases; 2, focusing two optical fields on the same spacial point of a target; 3, adjusting relative time delay of pumping light and probe light to obtain a two-dimensional photoelectron energy spectra; 4, reestablishing a time-domain outline of the extreme ultraviolet attosecond pulses to be detected by using a frequently-used iteration algorithm in FROG (Frequency-Resolved Optical Gating) to obtain pulse width. The method and device provided by the invention can be used for detecting the attosecond pulses, and also can be used in the application research of the attosecond pulses and the extreme ultraviolet attosecond pulse width.

The invention discloses a high-power ultrashort-pulse optical frequency comb generation method based on a self-similar amplifier. The high-power ultrashort-pulse optical frequency comb generation method is based on self-similar amplification technology and effectively overcomes gain narrowing, bandwidth limitation and nonlinear phase distortion in pulse amplification. A light spectrum is effectively expanded, and the bandwidth of an output pulse is reduced. Furthermore the power of a mode-locked pulse is effectively expanded, thereby acquiring a high-power femtosecond pulse and improving carrier envelope phase zero-frequency locking precision. Furthermore carrier envelope phase zero-frequency locking technology based on an acoustic-optical crystal frequency shifter is utilized, thereby realizing large reaction bandwidth and high control precision, and realizing a high-frequency high-power ultrashort-pulse optical frequency comb through real-time control. The high-power ultrashort-pulse optical frequency comb generation method is advantageous in that the high-power ultrashort-pulse optical frequency comb generation method can be directly expanded and applied on femtosecond optical frequency comb control technology for obtaining the stable high-frequency high-power ultrashort-pulse optical frequency comb.

The invention discloses a method and a device for generating a high-precision optical fiber optical comb seed pulse through full-optical difference frequency. The method is integrated with the processes of optical fiber ultrashort pulse generation, high-power optical fiber amplification, optical fiber non-linear frequency mixing, optical difference frequency and frequency doubling and the like; the device comprises a laser oscillator, a six-wave mixing amplifier, an optical comb difference frequency device and an optical comb frequency doubling device. Laser pulse finally output by the device is extremely close to system initial seed light frequency, and the carrier envelope phase is stable, so that the device can be directly taken as a seed optical comb of an optical fiber amplifier of a wave band corresponding to signal light. Two signal light required in the difference frequency process comes from the same non-linear mixing process, so that the phase noise of the signal light generated during the difference frequency can be automatically eliminated, and optical comb laser with high pulse strength and high contrast ratio, in which the infrared band carrier envelope phase is zero, is obtained.

The invention discloses an adaptive double optical comb spectral compensation signal extraction method. The adaptive double optical comb spectral compensation signal extraction method is characterized in that Michelson interferometers and electricity beat frequency acquire adaptive double optical comb spectral compensation signals; the time domain time-delay and frequency domain selection mode is used; the Michelson interferometers are effectively used to detect the pre pulse and after pulse of certain time-delay, and extract the signals representing the self repetition rate jitter and carrier envelope phase jitter of single pulse laser; and at last, through the electricity frequency multiplication and frequency mixing process, the compensation signals representing the corresponding repetition rate jitter and the corresponding carrier envelope phase jitter of the two pulse lasers can be obtained, and the compensation signals can be directly used for adaptive double optical comb spectral measurement. Compared with the prior art, the adaptive double optical comb spectral compensation signal extraction method completely avoid the mode that two narrow line-width continuous lasers are required to introduce in the adaptive double optical comb spectrum to extract compensation signals, so that the compensation signals are slightly interfered by the continuous optical wavelength drifting and is stable and reliable, and the stability and reliability of the adaptive double optical comb spectral system can be further improved.

The invention discloses a self-similarity amplifier based high-power ultrashort pulse optical frequency comb apparatus. The optical frequency comb apparatus comprises a laser seed source, a pulse amplification and control module, a repetition frequency locking module, a carrier envelope phase zero frequency signal measurement module and a carrier envelope phase zero frequency locking module; the laser seed source is connected with the pulse amplification and control module and the carrier envelope phase zero frequency locking module in sequence; the output end of the pulse amplification and control module is connected with the laser seed source through the repetition frequency locking module to form a backward closed loop cavity; and the output end of the pulse amplification and control module is connected with the carrier envelope phase zero frequency locking module through the carrier envelope phase zero frequency signal measurement module to form a forward closed loop cavity. The self-similarity amplifier based high-power ultrashort pulse optical frequency comb apparatus has the advantages that the optical frequency comb apparatus is based on a self-similarity amplification technology, and the problems of narrowed gain, limited bandwidth and nonlinear phase distortion in the pulse amplification are effectively overcome; and the spectrum is effectively broadened, high-power femtosecond pulse is obtained, and the carrier envelope phase zero frequency precision is improved.

An opto-electronic device (100) for processing optical and electric pulses includes a photoconductor device (10) with a sensor section (11) which is made of a band gap material and which has electrical sensor contacts (12, 13), and a signal processing device (20) which is connected with the sensor contacts (12, 13), wherein the photoconductor device (10) is adapted to create a photocurrent between the sensor contacts (12, 13) in response to an irradiation with ultra-short driving laser pulses (1) having a photon energy smaller than the energy band gap of the band gap material, having a non-zero electric field component (3) oriented parallel with a line (4) between the electrical sensor contacts (12, 13), and causing a charge carrier displacement in the band gap material, and wherein the signal processing device (20) is configured for an output of an electric signal being characteristic for at least one of carrier-envelope phase (CE phase), intensity, temporal properties, spectral intensity and spectral phase of the driving laser pulses (1). Furthermore, a laser source device including the opto-electronic device and pulse processing method for processing optical and electric pulses are described.

Apparatus for stabilizing carrier-envelope phase (CEP) of laser pulse generated by mode locked pulsed laser based on direct locking method includes laser oscillator, interferometer, detector and double feedback circuit. The laser oscillator includes the mode locked pulsed laser generating the laser pulse. The interferometer generates laser pulses having first and second frequency components from the laser pulse generated by the mode locked pulsed laser to generate first and second interference signals that substantially correspond to each other in time domain and space domain. The detector receives the first and second interference signals to output third and fourth interference signals by inverting phase of the second interference signal. The double feedback circuit controls the laser oscillator so that the CEP of the laser pulse generated by the mode locked pulsed laser has substantially constant value with respect to time using CEP signal obtained from the third and fourth interference signals.

A laser and amplifier combination delivers a sequence of optical pulses at a predetermined pulse-repetition frequency PRF. An interferometer generates a signal representative of the carrier-envelope phase (CEP) of the pulses at intervals corresponding to the PRF. The signal includes frequency components from DC to the PRF. The signal is divided into high and low frequency ranges. The high and low frequency ranges are sent to independent high frequency and low frequency control electronics, which drive respectively a high-frequency CEP controller and a low frequency controller for stabilizing the CEP of pulses in the sequence.

The invention relates to a wide spectral bandwidth ultrashort laser pulse seed source with a stable carrier-envelope phase (CEP). The seed source comprises a pumping source, a parametric amplification system, a spectrum widening system and a dispersion compensation system. Two difference frequency processes in parametric amplification are utilized to generate light beams with stable CEPs; a dichroic mirror is used to carry out beam combination; the combined light beam is coupled by a lens and then enters a hollow fiber to carry out spectrum widening and pulse compression; and then, a femtosecond ultrashort laser pulse output that has a stable CEP and a continuous super-wide spectral bandwidth is obtained. According to the invention, the seed source is simple and is easy to operate; a gap problem during combination of light beams with different wave bands can be solved; continuous super-wide spectral bandwidths can be obtained; and a femtosecond ultrashort laser pulse output of a monocyclic order or even a sub-cyclic order can be obtained by compression, wherein the output has a stable CEP; therefore, the seed source can be widely applied to many fields like attosecond pulse generation, pumping detection and THz generation and the like.

The invention discloses a method for measuring attosecond X-ray pulses and application of the method. According to the method disclosed by the invention, each measured related phase of a photoelectron is determined by using a parameterized computing formula, and the shape of a pulse and a concrete time structure are rebuilt through one step by using an analytical photoelectron spectrum unscrambling technology; and the time domain characteristics of the attosecond X-ray pulses can be rebuilt from each measured photoelectron spectrum without a large amount of time resolution measurements of a photoelectron spectrum and without a redundant iterative computation and an experimental data fitting process. The time uncertainty of a pulse measurement result is computed from energy bandwidth values of the pulses by using the parameterized formula. Because a direct relation among attosecond pulse time characteristics, important laser parameters (such as peak strength, electric field envelope shape, phase, carrier-envelope phase and the like), atomic or molecular ionization power and the photoelectron spectrum is established by a transformation equation, the method can be used for computing unknown parameters from each known parameter value.

The invention discloses a 1,053 nanometer femtosecond pulse generation device with a stable carrier envelope phase. The 1,053 nanometer femtosecond pulse generation device structurally comprises an optical parametric amplification system, a dichroic mirror pair, a frequency multiplication crystal and another dichroic mirror pair, wherein the optical parametric amplification system outputs a femtosecond pulse with a stable carrier envelope phase and center wavelength of 2,106 nanometers; the dichroic mirror pair has high reflectivity at the wave band of 2,106 nanometers and high transmissivity at the wave band of 1,290 nanometers; the frequency multiplication crystal is used for multiplying the frequency of the femtosecond pulse with center wavelength of 2,106 nanometers to 1,053 nanometers; and the other dichroic mirror pair has high reflectivity close to the wave band of 1,053 nanometers and high transmissivity close to the wave band of 2,106 nanometers. The device provided by the invention has the characteristics of center wavelength close to 1,053 nanometers, tunable property, stable carrier envelope phase, super contrast, stable work and the like, and is particularly suitable for being used as a front-end seed source of a high-power super contrast chirped-pulse amplification system and the optical parametric amplification system with operation wavelength of 1,053 nanometers or 1,064 nanometers.

The invention provides a detection apparatus of carrier envelope phase signals. The detection apparatus is characterized by comprising a pulse oscillator, a fiber amplifier, a spectrum spread device and a collinear type self-reference f-2f carrier envelope phase detection module which are successively connected through an optical path, wherein the collinear type self-reference f-2f carrier envelope phase detection module comprises multiple lenses, a PPLN crystal, a YV04 crystal and a photoelectric detector which are connected through an optical path, the lens is used for converting fiber light output by the spectrum spread device into space light, the YV04 crystal is used for introducing time-delay amounts of fundamental frequency light and frequency multiplication light, and the YV04 crystal is internally of an oblique cleft structure whose left portion and right portion can be vertically adjusted. Femtosecond pulses are injected into high-nonlinearity fibers for generating needed long-wave signals and short-wave signals, phase delays of long-wave signal pulses and short-wave signal pulses are optimized through polarization dispersion and envelope velocity dispersion of the YV04 crystal, and compared to a method of modifying a time-delay amount by use of space light path adjustment in a conventional apparatus, the accuracy is greatly improved.

An ultrashort pulse carrier-envelope phase detection device comprises an ultrashort pulse laser of a fixed repetition frequency, a michelson interferometer, an optical beam splitter, a first optical filter, a first photoelectric detector, a first electrical frequency doubling unit, a second optical filter, a second photoelectric detector, a second electrical frequency doubling unit, and an electrical frequency mixing and filtering unit. The ultrashort pulse laser, the michelson interferometer and the optical beam splitter are in light path connection in order. The first optical filter, the first photoelectric detector, and the first electrical frequency doubling unit with a multiple of (p-1) are connected with a first output end of the optical beam splitter. The second optical filter, the second photoelectric detector, and the second electrical frequency doubling unit with a multiple of p are connected with a second output end of the optical beam splitter. The electrical frequency mixing and filtering unit is connected with output ends of the first electrical frequency doubling unit and the second electrical frequency doubling unit. The modes of time domain time delay and frequency domain selection are adopted, front and back pulses delayed for a certain period are subjected to coherent detection with the michelson interferometer, two different frequency windows are used for frequency domain selection, signals representing carrier-envelope phase jitter are extracted, and measurement of the ultrashort pulse carrier-envelope phase signals are achieved by electrical frequency doubling and frequency mixing processes.

The invention discloses a network coherent amplification method for all-fiber chirped pulses. The method comprises the following steps of: pre-amplifying seed light by utilizing a low-noise fiber amplifier; splitting pre-amplified laser pulses into a plurality of paths by using a fiber beam splitter, wherein each path of light passes through a zero-frequency pre-compensation type cascade amplification system and a pulse width compression system respectively; and coherently synthesizing a plurality of paths of light into a path of high-power laser by using a fiber beam combiner. By a coherent amplification network, the problems of thermal effect, pulse deformation, noise and the like of direct amplification of light pulses are solved; and in addition, by a pre-compensation technology, carrier-envelope phase locking is stable and high in accuracy and output power compared with the conventional method of performing amplification, measuring a carrier phase by using an f-to-2f system and controlling a laser by using the feedback of a phase-locked circuit.

The invention provides a carrier envelope phase locking device for a femtosecond pulse laser, and the device comprises a self-phase modulator which is used for enabling a first femtosecond pulse laser spectrum emitted by a femtosecond pulse laser to be broadened, and emitting second femtosecond pulse laser; a carrier envelope phase adjustment element which is used for enabling the second femtosecond pulse laser to be divided into third femtosecond pulse laser and fourth femtosecond pulse laser, and adjusting the carrier envelope phase of the third femtosecond pulse laser; a negative dispersion which is used for enabling the pulse width of the third femtosecond pulse laser to be compressed into fifth femtosecond pulse laser at a sub-10 femtosecond order; a carrier envelope phase measurement apparatus which is used for measuring the carrier envelope phase of the fourth femtosecond pulse laser; and a carrier envelope phase adjustment apparatus which is used for adjusting the carrier envelope phase of the first femtosecond pulse laser according to the carrier envelope phase of the fourth femtosecond pulse laser. The device achieves the precise locking of the carrier envelope phase of the femtosecond pulse laser.

The invention discloses a petroleum and natural gas leakage detection method based on a double-optical frequency comb spectrum technology. According to the method, two optical frequency combs with small repetition frequency difference are used for converting to radio frequency detection under multi-heterodyne interference, and then are combined with a Fourier transform spectrum technology so as torealize noncontact online detection of petroleum and natural; the method comprises the following steps: (1) completing locking of repetition frequencies and carrier envelope phase deviation frequencies of two optical frequency combs; (2) detecting natural gas leakage; (3) the two optical frequency combs carry out multi-heterodyne interference radio frequency detection; (4) carrying out Fourier transform through a computer to restore spectral information; and (5) judging whether the natural gas detection area leaks or not. The method has the advantages that the spectral resolution and the signal-to-noise ratio of the method are higher, various gas components can be discriminated at the same time, and the anti-interference capability is high.

The invention discloses a device and method using pulse accumulation and amplification to realize a high power ultrashort pulse laser. The device comprises a pulse laser beam splitting system, a pulse amplification system, a continuous laser beam splitting system, a carrier envelope phase synchronization system and a balance optical cross-correlation pulse accumulation and amplification system. The method comprises the steps of: splitting the pulse laser into a plurality of paths; respectively amplifying or compressing each path of the laser to obtain a plurality of paths of ultrashort pulses relatively high in power; locking the amplified plurality of paths of ultrashort pulses relatively high in power onto one path by means of frequency beating with a continuous laser device and circuit frequency mixing so as to realize carrier envelope phase synchronization of the plurality of paths of pulse lasers; and finally, performing coherent combination on the plurality of paths of pulse lasers through a balance optical cross-correlation technology, realizing the accumulation and amplification of the plurality of paths of pulse lasers, and outputting the ultrahigh power ultrashort pulses.

Disclosed is a method for measuring carrier-envelop phase positions of few-circle femtosecond laser pulses. The method includes the steps of arranging a device, measuring and calculating the absolute value of a laser carrier-envelope phase position to be measured. By the method, accuracy of the carrier-envelop phase positions of the few-circle femtosecond laser pulses can be directly measured, and a reliable route is provided for measuring the absolute value of the carrier-envelop phase positions.

The invention discloses a photoionization device for measuring an absolute phase of a carrier envelope of an optical pulse, comprising a gas intake system, a vacuum cavity, a pump unit and a signal acquisition card, wherein the vacuum cavity is connected with the pump unit and comprises a detection cavity and a reaction cavity; the reaction cavity is positioned in the center of the detection cavity; light beams are focused into the reaction cavity, a gas is ionized under the action of an optical field, and photoionization electrons are reversely ejected through small holes positioned at both sides of the reaction cavity; the detection cavity is connected with two microchannel plate detectors, and the ejected photoionization electrons respectively fly to respective microchannel plate detectors and form pulse currents on the microchannel plate detectors; and signals of the pulse currents are recorded by the signal acquisition card so as to compute the carrier envelope phase of an ultrashort laser pulse. The invention can measure the carrier envelope phase by utilizing the reverse symmetry of photoionization and has compact structure and high sensitivity and accuracy.

The invention discloses an all-solid-state optical frequency comb system. The all-solid-state optical frequency comb system comprises an all-solid-state laser of an optical fiber light source pump, a supercontinuum generation part, an f-2f part and a circuit feedback system, wherein the all-solid-state laser is used as a light source of the whole all-solid-state optical frequency comb system; the supercontinuum generation part is used for receiving output light of the all-solid-state laser and generating a supercontinuum covering an octave; the f-2f part is used for receiving the output light generated by the supercontinuum generation part and generating a carrier-envelope phase-shift frequency signal; the circuit feedback system is used for feeding back the carrier-envelope phase-shift frequency signal generated by the f-2f part to the all-solid-state laser. The all-solid-state optical frequency comb system disclosed by the invention has the advantages of low cost and low phase noise; meanwhile, the all-solid-state optical frequency comb system has the characteristics of short pulse width, good supercontinuum coherence, flexible structure and the like; the all-solid-state optical frequency comb system is a novel optical frequency comb having great development potential.