LabVIEW based stability evaluation for femtosecond laser light source on distance measurement
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In order to evaluate the light source stability of femtosecond lasers distance measurement,the system collects the repeat frequency data of the light source using frequency meter,Allan Variance is calculated through LabVIEW program.The analysis shows that the key factors to the laser repetition frequency stability is phase modulation and random walk frequency modulation.Keywords:
Allan variance
Modulation (music)
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Optical frequency comb
Distance measurement
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Femtosecond laser double-pulse has important application value on the study of ultra-fast transient process area. How to realize the high accuracy of femtosecond laser pulse real-time measurement is particularly important.This paper presents a method on autocorrelation of femtosecond laser double-pulse measurement.It contains the measurement techniques of pulse interval,pulse width and the intensity ratio.Autocorrelator was used in the experiment to get the autocorrelation curve of the femtosecond laser double-pulse.The femtosecond laser double-pulse were generated by the birefringent crystal.Relying on the autocorrelation curve,the pulse interval,pulse width and the intensity ratio were got by non-linear fitting method. Contrasted the traditional cross-correlation measurement,the autocorrelation method overcome the uncertainty of the independent pulse impact on accuracy.It makes the measuring precision could be improved by more than 48% on average.
Autocorrelator
Autocorrelation technique
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We perform high-precision frequency measurements in the THz frequency range using an unstabilized femtosecond laser. A simple and flexible algorithm is used to correct the beating signal resulting from the THz source and one comb line of the rectified optical comb for fluctuations of the laser repetition rate. Using this technique, we demonstrate an accuracy of our measurement device as high as (9 ± 3) · 10−14 for the measurement of a 100 GHz source. This is two orders of magnitude better than previous precision measurements in this frequency range employing femtosecond lasers.
Accuracy and precision
SIGNAL (programming language)
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Femtosecond pulse measurement of ultrafast spectrum is one of the important research directions in the ultrafast laser field. The conventional femtosecond pulse autocorrelation method is implemented by measuring the autocorrelated frequency-doubling signal, and the frequency-doubling signal has wavelength selectivity, so the femtosecond pulse measurement for the case of different central wavelengths needs to replace different frequency-doubling crystals, which is very inconvenient. This paper reports a kind of modified transient grating frequency resolution optical gating for measuring the femtosecond pulses. The method combines frequency-resolved optical gating (FROG) method with four-wave mixing. Its basic process is to divide the pulse to be measured into three beams. Two of the pulses can reach spatiotemporal coincidence on optical medium through precise delay control and focus. The other pulse interacts with the transient grating, and serves as the detection light to produce signal light. The spectrum and delay time of the signal light are measured by a spectrometer, and the spectrum and electric field information of the femtosecond pulse to be measured are obtained through the inversion iterative algorithm. Because this method only needs the power density of the measured light to reach the third-order nonlinear effect, it can be applied to the femtosecond pulse measurement of any central wavelength. We use this method to measure the femtosecond pulses with the central wavelengths of 800 nm and 400 nm respectively, and the ultra-wide spectrum femtosecond pulses with the period magnitude of sub-10 fs, and compare the measurement results with the results obtained with the conventional interferometric autocorrelation instrument. They are basically consistent. The experimental results show that our frequency-resolved optical switching method based on transient grating is very effective for measuring the femtosecond pulses with different central wavelengths and pulse widths.
Frequency-resolved optical gating
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Combining with the features of femtosecond laser,such as ultrahigh strength and peak power,ultrarapid pulses,ultralhigh steady,wide frequency range,self coherent,its application are introduced.It can be used to physics,biology,chemistry,information,and communication.It is applied to materials manufacture,electrons accelerating,nuclear control etc.and it also can be used in the optical frequency measurement,remote distance measurement,optical clock,and so on.Finally,both the optical clock and its application are described.
Master clock
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