Self-compression of attosecond high-order harmonic pulses in the harmonic generation medium itself has been demonstrated. The attosecond pulses were generated in an argon-filled gas cell and compressed by exploiting the dispersion characteristics of argon. Since the harmonic generation medium itself was used as the compression medium, continuous chirp control was easily achieved by adjusting the gas pressure. The optimized attosecond pulse was also the most intense, and its duration of 206 as was very close to the transform-limited value of 200 as.
We generate 1.24 mJ, 390 fs pulses at 1035 nm in a CPA laser system featuring a 2.8 mJ Yb:CaF(2) regenerative amplifier, stretcher/compressor based on a single chirped volume Bragg grating and a compact, low-dispersion grating compressor. The auxiliary compressor is used to effectively pre-compensate the intra-cavity dispersion of the amplifier.
The control and data acquisition of homemade, second harmonic generation (SHG) multi-shot frequency-resolved optical gating (FROG) diagnostic technique reported here. We have designed and developed the computer controlled multi-shot FROG diagnostic system using reflecting optics to minimize the dispersion while LabVIEW software has employed to control and data acquisition. The femtosecond laser system at laboratory for intense lasers (L2I) optimized and characterized using LabVIEW-based FROG system. We have measured and retrieved the oscillator and compressed amplified laser pulse profiles in temporal domains having full width half maximum (FWHM) of 150 and 270 fs, respectively, and relatively small temporal phase $1 radians peak to peak variations with FROG error $0.003. The grating detuning data acquired in the form of the single data file to observe the FROG trace pattern evaluation with the change of grating positions to confirm the reliability of the LabVIEW-based FROG system.femtosecond laser, LabVIEW, second harmonic generation multi-shot frequency-resolved optical gating
| I NT RODU CTI ONThe FROG technique has used for the characterization and optimization of femtosecond laser pulses in the time and frequency domain simultaneously. [1][2][3][4][5][6][7][8][9][10][11] The SHG-FROG is emerged out as one of the most reliable and standard diagnostic technique for the measurement of few cycle 12 and ultrashort laser pulses. 13,14 The capability of measuring and retrieving FROG traces is quite vital in the experiments which involve pulse shaping dynamics. 15 We developed computer controlled FROG system at minimal cost as compare to the commercially available costly FROG systems such as FROGscan [Mesaphotonics, Inc.] (http://www.mesaphotonics.com/products-2/pulse-measurement/frogscan/). Our system may have limited functionalities compare to the commercial system but is more stable and reliable. We adapted multi-shot measurement technique in designing the computer controlled SHG-FROG system to characterize the femtosecond laser pulses. The ability of wide temporal scan range of mechanically scanning method has given the preference over the single-shot SHG-FROG technique. 2,7 A very slow, variable motorized delay line (MM3000, Motion Controller/Driver, Newport, Inc.) and handy USB-spectrometer (1HR2000, Ocean Optics, Inc.) used to take the measurements of SHG-FROG over many seconds to the period of several minutes. We present an efficient multi-shot FROG system in a way to observe the SHG-FROG spectrum in real time which is processed and acquired by using a LabVIEW (National Instruments, Inc.). This system delivers more straight output and more flexible than a single-shot FROG due to its aptitude of regulating the temporal width of measured trace. LabVIEW itself a graphical development environment for creating a flexible and scalable test, measurement, and control applications rapidly at nominal cost. Using this virtual instrument technology, one can make full use of computer resource, generalizing instrument har...
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