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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Possibilities of frequency combs generated by femtosecond lasers in high precision spectroscopy on atomic hydrogen was explored at the 10/sup -14/ level. Fundamental tests of the fs frequency comb technique were done. Further applications arise in the time domain where the phase between the carrier and the envelope of a pulse can now be determined, allowing the production of isolated XUV attosecond pulses.
Attosecond
Extreme ultraviolet
Femtochemistry
Ultrafast optics
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Possibilities of using recently-developed femtosecond pulse lasers for advanced precision length metrology are investigated. Special emphasis is placed on the use of femtosecond lasers particularly for absolute distance measurements with sub-micrometer accuracy over extensive ranges. This investigation reveals that femtosecond lasers are capable of providing a suitable means of nanometrology by implementing dispersive comb interferometry in combination with synthetic wavelength interferometry and heterodyne interferometry.
Nanometrology
Distance measurement
Micrometer
Heterodyne (poetry)
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To measure the pulse width of femtosecond laser rapidly and accurately,a measurement system was designed based on the second order autocorrelation principle.The results show that pulse width of the seed laser at 800nm was 199.51fs tested by the independently designed measurement system and was 217.6fs tested by the single pulse autocorrelation instrument of Coherent company.The error is only 0.43%.The results proved that this independent measurement system can test the femtosecond pulse width precisely.
Femtosecond pulse
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Electronic distance meters (EDMs) are widely used in different applications, such as surveying and civil engineering. In order to calibrate an EDM, different techniques can be used, including displacement interferometers and reference baselines. In this paper, an indoor baseline is designed and then accurately measured using femtosecond laser pulses from an optical frequency comb to be used for EDM calibration. The baseline consists of 13 fixed bases that cover 58 m distance. In order to accurately measure the distances between the bases, autocorrelation between femtosecond laser pulses is employed. The measurement shows a maximum precision of 14 µm over the 13 bases. Although this deviation is dominated mainly by the placement of the target mirror, the system capability is much more sufficient to safely calibrate the best available commercial EDM. The stability of the baseline is also investigated by measuring the interbase distances over long periods of time.
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摘要: 钛宝石飞秒激光放大系统具有重复频率低、脉冲波形复杂等特点，为准确测量其峰值功率，提出对单次脉冲波形和脉冲宽度测量的需求。介绍了单脉冲飞秒激光时域波形和脉冲宽度的测量原理和测量方法，设计了基于频率分辨光学开关法的单脉冲飞秒激光时域参数测量装置。讨论了单脉冲飞秒激光时域参数测量校准面临的问题及解决方法。 关键词: 飞秒激光 / 脉冲宽度 / 脉冲波形 / 单次脉冲测量
Femtosecond pulse
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New lasers, special digital signal processing electronics, algorithms and new materials for optics enabled development of new absolute distance measurement methods. The phenomenon of the mode-lock of the femtosecond pulse laser increased a number of potential applications with distance surveying where a stable generator of very short and periodically repeated coherent pulses can be used. The aim of the work is a presentation of our unique control algorithm for measuring the length of unknown distance with direct traceability to a time standard. The principle is based on a passive optical cavity with mirrors keeping distance to be measured. Time spacing of short femtosecond pulses generated by femtosecond laser is optically phase locked to the cavity free spectral range. A value of the repetition frequency of the laser determines the measured distance in that case.
Comb generator
Optical cavity
SIGNAL (programming language)
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A method for measurement of the absolute phase by using femtosecond laser spectral interference technique has been reported. Theoretical simulation indicates that the interference fringes of double femtosecond laser pulses are significantly different when phase difference between the double femtosecond laser pulses is different. An experimental apparatus based on a Michelson interferometer devices is built, in which one femtosecond laser pulse is split into two pulses in half by a beam splitter (BS), each pulse is reflected by mirrors and the two pulses are then reunited. The double femtosecond laser pulses interfere with each other and are focused on a spectrometer to record the spectral interference fringes. By applying Fourier transformation to the recorded spectral interference signal, we retrieve the absolute phase between the double femtosecond laser pulses. Theory analysis and experiment results show that this method is reasonable and efficient, which present a new application of femtosecond laser interference. We believe that the method reported in this paper provides a useful approach for measuring the absolute phase which should have applications in determining thickness and measuring refractive index of optical samples.
Beam splitter
Absolute phase
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Femtosecond lasers began to draw attention as a new light source for high-precision absolute distance measurements (ADMs) allowing for advanced principles such as synthetic wavelength generation, Fourier-transform-based dispersive analysis and multi-wavelength interferometry. In this talk, we present the state-of-the-art measurement principles and performance demonstrated by exploiting the unique temporal and spectral characteristics of femtosecond laser pulses for ADM applications.
Distance measurement
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The cross correlation between a pair of femtosecond lasers with slightly different repetition rates enables high precision, high update rate time-of-flight (TOF) distance measurements against multiple targets. Here, we investigate the obtainable ranging precision set by the timing jitter from femtosecond lasers. An analytical model governing dual femtosecond laser TOF distance measurement in the presence of pulse train timing jitter is built at first. A numerical study is conducted by involving typical timing jitter sources in femtosecond lasers in the following. Finally, the analytical and numerical models are verified by a TOF ranging experiment using a pair of free running femtosecond Er-fiber lasers. The timing jitter of the lasers is also characterized by an attosecond resolution balanced optical cross correlation method. The comparison between experiment and numerical model shows that the quantum-limited timing jitter of femtosecond lasers sets a fundamental limit on the performance of dual femtosecond laser TOF distance measurements.
Ranging
Attosecond
Temporal resolution
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An ultrafast and Doppler-free optical ranging system based on dispersive frequency-modulated interferometry is demonstrated. The principle is similar to the conventional frequency-modulated continuous-wave interferometry where the range information is derived from the beat frequency between the object signal and the reference signal. However, a passive and static frequency scanning is performed based on the chromatic dispersion of a transform-limited femtosecond pulse in the time domain. We point out that the unbalanced dispersion introduced in the Mach-Zehnder interferometer can be optimized to eliminate the frequency chirp in the temporal interferograms pertaining to the third order dispersion of the all-fiber system, if the dynamic range being considered is small. Some negative factors, such as the polarization instability of the femtosecond pulse, the power fluctuation of the optical signal and the nonuniform gain spectrum of the erbium-doped fiber amplifier lead to an obvious envelope deformation of the temporal interferograms from the Gaussian shape. Thus a new data processing method is proposed to guarantee the range resolution. In the experiment, the vibration of a speaker is measured. A range resolution of 1.59 microm is achieved with an exposure time of 394 fs at a sampling rate of 48.6 MHz.
Chirp
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