A Method of Measuring the Synchronization Accuracy of Synchronized Pulse Laser
A technology of pulsed lasers and synchronous pulses, which is applied in the direction of measuring optics, measuring devices, optical radiation measurement, etc., can solve the problems of pulse time and space adjustment coincidence difficulties, difficulty in detecting sum-frequency signals, and reduction of pulse peak power, etc., to achieve Advantages of synchronization accuracy, high measurement sensitivity, and low pulse peak power
Active Publication Date: 2017-04-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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But in some cases, this method also has certain limitations. For example, when the laser power is low, or when the pulse width is wide due to high repetition frequency and large dispersion, the peak power of the pulse participating in the sum frequency is will be greatly reduced, thereby affecting the sum-frequency efficiency, and in some cases it is even difficult to detect the sum-frequency signal
As another example, when the central frequency of the synchronous lasers is the same, the cross-correlation experiment needs to make the two optical paths cross and overlap on the BBO crystal. If the laser pulse width is narrow (for example, sub-10fs), the pulse time and space will be adjusted and overlapped. become more difficult
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[0024] First, theoretically deduce the principle on which the method of the present invention is based.
[0025] Assuming that two lasers emit a laser pulse respectively, and the envelopes of the two laser pulses are both Gaussian, the forms of the two pulses can be expressed as:
[0026]
[0027]
[0028] where E 01 ,E 02 is the peak power of two pulses, T 1 and T 2 is the pulse full width at half maximum, ν 0 is the carrier frequency, Δν represents the difference between two pulse carrier frequencies, Represents the initial phase of the carrier, t' is the time at the scale of a single pulse, and τ is the time offset between two pulses, which characterizes the degree of overlap of the pulses emitted by the two lasers in the time domain.
[0029] At a certain moment, the two pulse signals arrive at the photodetector basically at the same time for beat frequency superposition, and the superimposed light intensity signal is measured by the photodetector. After ignor...
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The invention provides a method for measuring synchronization precision of a synchronous pulse laser. The synchronous pulse laser comprises a first pulse laser and a second pulse laser which are synchronous and output a first pulse sequence and a second pulse sequence respectively and correspondingly. The method includes the steps: for superposition and light intensity measurement, superposing the first pulse sequence and the second pulse sequence and measuring a light intensity signal after superposition; for beat frequency signal acquisition, filtering out a beat frequency signal from the light intensity signal, wherein amplitude of the beat frequency signal changes with time offset between corresponding pulses in the first pulse sequence and the second pulse sequence; for time offset computation, according to a predetermined predefined function relationship between the amplitude of the beat frequency signal and the time offset, computing time offset corresponding to an amplitude value in the beat frequency signal. The method avoids usage of a nonlinear crystal, is relatively simple in light path layout and adjustment, and has big advantages in the aspect of measuring synchronization precision of low-peak power pulses.
Description
technical field [0001] The invention relates to the field of synchronous precision measurement of synchronous lasers, in particular to a method for measuring the synchronous precision of synchronous pulse lasers. Background technique [0002] High-precision synchronous lasers are widely used in physics, chemistry, biology and information communication. In the field of ultrafast detection, the "pump-probe" experiment (J.S.Yahng, Y.H.Ahn et al.J.Opt.Soc.Am.B, 2001.18:714) requires two synchronized laser beams as a tool, one of which uses To excite matter, another beam is used to probe its instantaneous physical properties. In terms of light sources, if the phase locking of multiple synchronized laser beams is realized, the coherent combination of laser beams can be realized (R.K.Shelton, L.S.Ma et al.Science, 2001.293:1286). If two synchronized femtosecond laser beams with different wavelengths are compared frequency, it can generate mid-infrared, far-infrared and even terah...
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IPC IPC(8): G01J9/00G01M11/02
Inventor 韩海年于子蛟张龙张金伟侯磊叶蓬魏志义
Owner INST OF PHYSICS - CHINESE ACAD OF SCI