scholarly journals Timing Fluctuation Correction of A Femtosecond Regenerative Amplifier

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1242
Author(s):  
Keyang Liu ◽  
Hongyang Li ◽  
Xinliang Wang ◽  
Yanqi Liu ◽  
Liwei Song ◽  
...  
Keyword(s):  
Laser System ◽  
Laser Pulses ◽  
Timing Jitter ◽  
Regenerative Amplifier ◽  
Sum Frequency ◽  
Long Term Stability ◽  
Reference Oscillator ◽  
Correction Scheme ◽  
Laser Facility

We report on the long-term correction of a timing fluctuation between the femtosecond regenerative amplifier and the reference oscillator for the seed 100 PW laser system in the Station of Extreme Light (SEL). The timing fluctuation was characterized by a noncollinear balanced optical cross-correlator that maps the time difference to the sum frequency intensity of the amplifier and oscillator laser pulses. A feedback loop was employed to correct the timing jitter by adjusting the time delay line in the amplifier beam path. The timing fluctuation was reduced to 1.26 fs root-mean-square from hundreds of fs over 10 hours. Benefitting from excellent performance and long-term stability, this timing jitter correction scheme, as a component of optical synchronization in the 100 PW laser facility, will be integrated into SEL.

scholarly journals Polarization lidar: An extended three-signal calibration approach

2018 ◽  
Author(s):  
Cristofer Jimenez ◽  
Albert Ansmann ◽  
Moritz Haarig ◽  
Ronny Engelmann ◽  
Jörg Schmidt ◽  
...  
Keyword(s):  
Polarization Plane ◽  
Laser Pulses ◽  
Experimental Conditions ◽  
New Formalism ◽  
Long Term Stability ◽  
Receiver Unit ◽  
Water Cloud ◽  
Elliptically Polarized

Abstract. We present a new formalism to calibrate a three-signal polarization lidar and to measure highly accurate height profiles of the volume linear depolarization ratios under realistic experimental conditions. The methodology considers elliptically polarized laser light, angular misalignment of the receiver unit with respect to the main polarization plane of the laser pulses, and cross-talk between the receiver channels. A case study of a liquid-water cloud observation demonstrates the potential of the new technique. Long-term observations of the calibration parameters corroborate the robustness of the method and the long-term stability of the three-signal polarization lidar. A comparison with another polarization lidar shows excellent agreement regarding the derived volume linear polarization ratio of biomass burning smoke throughout the troposphere and the lower stratosphere up to 16 km height.

A high power CH3OH FIR laser system with long-term stability

1986 ◽  
Vol 7 (10) ◽  
pp. 1677-1690 ◽  
Author(s):  
I. Boscolo ◽  
A. Pando ◽  
A. Passaseo ◽  
P. Bernardini
Keyword(s):  
High Power ◽  
Laser System ◽  
Fir Laser ◽  
Term Stability ◽  
Long Term Stability

scholarly journals Measurement of amplified binary-modulated chirped laser pulses generated by different acousto-optic pulse shaping algorithms

2020 ◽  
Author(s):  
Vladimir Molchanov ◽  
Konstantin Yushkov ◽  
Pavel Kostryukov ◽  
Petr Gornostaev ◽  
Nikolay Vorobiev
Keyword(s):  
Pulse Shaping ◽  
Delay Line ◽  
Ultrafast Optics ◽  
Laser System ◽  
Laser Pulses ◽  
Fourier Synthesis ◽  
Pulse Front ◽  
Regenerative Amplifier ◽  
Front Duration ◽  
Chirped Pulse Amplification

The paper belongs to the field of ultrafast optics. Acousto-optic pulse shaping has been studied experimentally for binary intensity modulation in a chirped pulse amplification laser system. Direct time-domain measurement of pulse front duration with a picosecond streak camera was performed for a Ti:sapphire regenerative amplifier. It was discovered that the sign of the second order dispersion produced by the acousto-optic dispersion delay line affects the modulation rise/fall time. Two algorithms for synthesis of ultrasonic waveforms for feeding the delay line, dispersive Fourier synthesis and the Gerchberg-Saxton algorithm, were compared. Minimum pulse front duration of 3.6 ps for 3 mJ pulses with the linear chirp of 6.2 ps/nm at the wavelength of 795 nm was obtained.

scholarly journals PASSIVE STABILISATION OF MICHELSON INTERFEROMETER

2020 ◽  
Vol 30 (4) ◽  
pp. 63-74
Author(s):  
N. A. Gryaznov ◽  
◽  
D. А. Goryachkin ◽  
V. I. Kuprenyuk ◽  
Е. N. Sosnov ◽  
...  
Keyword(s):  
Phase Difference ◽  
Michelson Interferometer ◽  
Laser Pulses ◽  
High Accuracy ◽  
Ultrashort Laser Pulses ◽  
Laser Resonator ◽  
Long Term Stability ◽  
Ultrashort Laser ◽  
Radiation Beams

In some applications of a Michelson interferometer, in particular, when it is used in a laser resonator, the phase difference of radiation beams passing the interferometer optical branches must be stabilized with high accuracy. The proposed paper is devoted to experimental studying the long-term stability of several interferometer designs and choosing the optimal version for applying as a compound resonator mirror with the controllable reflection for generation of ultrashort laser pulses.

scholarly journals Polarization lidar: an extended three-signal calibration approach

2019 ◽  
Vol 12 (2) ◽  
pp. 1077-1093 ◽  
Author(s):  
Cristofer Jimenez ◽  
Albert Ansmann ◽  
Ronny Engelmann ◽  
Moritz Haarig ◽  
Jörg Schmidt ◽  
...  
Keyword(s):  
Polarization Plane ◽  
Laser Pulses ◽  
Experimental Conditions ◽  
New Formalism ◽  
Long Term Stability ◽  
Receiver Unit ◽  
Water Cloud ◽  
Elliptically Polarized

Abstract. We present a new formalism to calibrate a three-signal polarization lidar and to measure highly accurate height profiles of the volume linear depolarization ratios under realistic experimental conditions. The methodology considers elliptically polarized laser light, angular misalignment of the receiver unit with respect to the main polarization plane of the laser pulses, and cross talk among the receiver channels. A case study of a liquid-water cloud observation demonstrates the potential of the new technique. Long-term observations of the calibration parameters corroborate the robustness of the method and the long-term stability of the three-signal polarization lidar. A comparison with a second polarization lidar shows excellent agreement regarding the derived volume linear polarization ratios in different scenarios: a biomass burning smoke event throughout the troposphere and the lower stratosphere up to 16 km in height, a dust case, and also a cirrus cloud case.

scholarly journals GARPUN-MTW: A hybrid Ti:Sapphire/KrF laser facility for simultaneous amplification of subpicosecond/nanosecond pulses relevant to fast-ignition ICF concept

2007 ◽  
Vol 25 (3) ◽  
pp. 435-451 ◽  
Author(s):  
V.D. Zvorykin ◽  
N.V. Didenko ◽  
A.A. Ionin ◽  
I.V. Kholin ◽  
A.V. Konyashchenko ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Large Scale ◽  
Short Pulse ◽  
Laser System ◽  
Laser Pulses ◽  
Fast Ignition ◽  
Nanosecond Laser ◽  
Nanosecond Pulses ◽  
Krf Laser ◽  
Laser Facility

The first stage of the petawatt excimer laser project started at the P.N. Lebedev Physical Institute, implements a development of multiterawatt hybrid GARPUN-MTW laser facility for generation of ultra-high intensity subpicosecond ultraviolet (UV) laser pulses. Under this project, a multi-stage e-beam-pumped 100-J, 100-ns GARPUN KrF laser was upgraded with a femtosecond Ti:Sapphire front-end, to produce combined subpicosecond/nanosecond laser pulses with variable time delay. Attractive possibility to amplify simultaneously short and long pulses in the same large-scale KrF amplifiers is analyzed with regard to the fast-ignition, inertial confinement fusion problem. Detailed description of hybrid laser system is presented with synchronized KrF and Ti:Sapphire master oscillators. Based on gain and absorption measurements at GARPUN amplifier and numerical simulations with a quasi-stationary code, we are predicting that 1.6 J can be obtained in a short pulse at hybrid GARPUN-MTW Ti:Sapphire/KrF laser facility, combined with several tens of joules in nanosecond pulse. Amplified spontaneous emission, which is responsible for the pre-pulse formation on a target, was also investigated: its acceptable level can be provided by properly choosing staged gain or loading the amplifiers by quasi-steady laser radiation. Fluorescence and transient absorption spectra of Ar/Kr/F2 mixtures conventionally used in KrF amplifiers were recorded to find out the possibility for femtosecond pulse amplification at the broadband Kr2F (42Γ → 1,2 2Γ) transition, which benefits in 100 times higher saturation energy density than for KrF (B → X) transition.

scholarly journals Measurement of amplified binary-modulated chirped laser pulses generated by different acousto-optic pulse shaping algorithms

2020 ◽  
Author(s):  
Vladimir Molchanov ◽  
Konstantin Yushkov ◽  
Pavel Kostryukov ◽  
Petr Gornostaev ◽  
Nikolay Vorobiev
Keyword(s):  
Pulse Shaping ◽  
Delay Line ◽  
Ultrafast Optics ◽  
Laser System ◽  
Laser Pulses ◽  
Fourier Synthesis ◽  
Pulse Front ◽  
Regenerative Amplifier ◽  
Front Duration ◽  
Chirped Pulse Amplification

The paper belongs to the field of ultrafast optics. Acousto-optic pulse shaping has been studied experimentally for binary intensity modulation in a chirped pulse amplification laser system. Direct time-domain measurement of pulse front duration with a picosecond streak camera was performed for a Ti:sapphire regenerative amplifier. It was discovered that the sign of the second order dispersion produced by the acousto-optic dispersion delay line affects the modulation rise/fall time. Two algorithms for synthesis of ultrasonic waveforms for feeding the delay line, dispersive Fourier synthesis and the Gerchberg-Saxton algorithm, were compared. Minimum pulse front duration of 3.6 ps for 3 mJ pulses with the linear chirp of 6.2 ps/nm at the wavelength of 795 nm was obtained.

Stability and Change in Emotional Intelligence: Exploring the Transition to Young Adulthood

2005 ◽  
Vol 26 (2) ◽  
pp. 100-106 ◽  
Author(s):  
James D.A. Parker ◽  
Donald H. Saklofske ◽  
Laura M. Wood ◽  
Jennifer M. Eastabrook ◽  
Robyn N. Taylor
Keyword(s):  
High School ◽  
Emotional Intelligence ◽  
Postsecondary Education ◽  
Life Transition ◽  
Full Time ◽  
Major Life ◽  
Long Term Stability ◽  
Time Period ◽  
Transition From High School

Abstract. The concept of emotional intelligence (EI) has attracted growing interest from researchers working in various fields. The present study examined the long-term stability (32 months) of EI-related abilities over the course of a major life transition (the transition from high school to university). During the first week of full-time study, a large group of undergraduates completed the EQ-i:Short; 32 months later a random subset of these students (N = 238), who had started their postsecondary education within 24 months of graduating from high school, completed the measures for a second time. The study found EI scores to be relatively stable over the 32-month time period. EI scores were also found to be significantly higher at Time 2; the overall pattern of change in EI-levels was more than can be attributed to the increased age of the participants.

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