Atmospheric turbulence induced synthetic aperture lidar phase error compensation

Lu, Tianan; Li, Hongping

doi:10.1016/j.optcom.2016.06.089

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…Over the past decade, most previous simulation and experiment works on ISAL and SAL imaging in atmospheric turbulence have been demonstrated [4][5][6][7][8][9][10][11]. In 2014, the performance characterization of phase gradient autofocus for ISAL was studied by CJ Pellizzari [12], who showed that the phase gradient algorithm (PGA) can still maintain its advantage of automatic focusing under atmospheric turbulence and low signal-to-noise ratio (SNR) conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In 2014, the performance characterization of phase gradient autofocus for ISAL was studied by CJ Pellizzari [12], who showed that the phase gradient algorithm (PGA) can still maintain its advantage of automatic focusing under atmospheric turbulence and low signal-to-noise ratio (SNR) conditions. In 2016, based on a Monte Carlo random factor, Lu Tian-an [6] used a Kolmogorov phase screen to simulate turbulence and rank one phase error estimation to compensate SAL images. Russell Trahan [3] demonstrated the correction capability of the PGA algorithm under a low carrier-to-noise ratio (CNR) and atmospheric turbulence through experimentation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

et al. 2023

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Inverse synthetic aperture ladar (ISAL) can achieve high-resolution images for long-range moving targets, while its performance is affected by atmospheric turbulence. In this paper, the dynamic evolution of atmospheric turbulence is studied by using an infinitely long phase screen (ILPS), and the atmospheric coherent time is defined to describe the variation speed of the phase fluctuation induced by atmospheric turbulence. The simulation results show that the temporal decoherence of the echo induced by turbulence causes phase fluctuation and introduces an extra random phase, which deteriorates the phase stability and makes coherent synthesis impossible. Thus, we evaluated its effects on ISAL imaging and found a method to mitigate the impact of turbulence on ISAL images. The phase compensation algorithm could correct the phase variation in different pulses instead of that within the same pulse. Therefore, the relationship between the atmospheric coherent time and pulse duration time (rather than that between the atmospheric coherent time and ISAL imaging time) ultimately determines the ISAL imaging quality. Furthermore, these adverse effects could be mitigated by increasing the atmospheric coherent time or decreasing the pulse duration time, which results in an improvement in the ISAL imaging quality.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

et al. 2023

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“…Generation of high power ultrashort optical pulses, frequency conversion, optical coherence tomography, nonlinear microscopy and remote sensing applications are some of the examples that these type of laser sources potentially offer as significant benefits [1][2][3][4]. Furthermore, for 3-D mapping of (i) spectral indicators of Earth features and high precision ground topography, (ii) atmospheric species and physical attributes, these laser sources provide a powerful tool in air-borne and space-borne remote sensing in laser-based lidar and altimetry such as resonant backscatter lidar and ground vegetation biomass/bio-health detection applications [1,[5][6][7][8]. On the other hand, cutting-edge laser technologies with airborne and space-borne qualification are needed for these remote sensing applications where strict reqirements, especially for space-borne applications, severely narrows the class of lasers that can be utilized in the space environment.…”

Section: Introductionmentioning

confidence: 99%

Diode-pumped Alexandrite laser with passive SESAM Q-switching and wavelength tunability

Parali

Sheng

Minassian³

et al. 2018

Optics Communications

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We report the first experimental demonstration of a wavelength tunable passively Q-switched red-diode-end pumped Alexandrite laser using a semiconductor saturable absorber mirror (SESAM). We present the results of the study of passive SESAM Q-switching and wavelength-tuning in continuous diode-pumped Alexandrite lasers in both linear cavity and X-cavity configurations. In the linear cavity configuration, pulsed operation up to 27 kHz repetition rate in fundamental TEM00 mode was achieved and maximum average power was 41 mW. The shortest pulse generated was 550 ns (FWHM) and the Q-switched wavelength tuning band spanned was between 740 nm and 755 nm. In the X-cavity configuration, a higher average power up to 73 mW, and obtained with higher pulse energy 6.5 J at 11.2 kHz repetition rate, in fundamental TEM00 mode with excellent spatial quality M2 < 1.1. The Q-switched wavelength tuning band spanned was between 775 nm and 781 nm

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“…Nonlinear microscopy, optical coherence tomography, frequency conversion, generation of high power ultrashort optical pulses and remote sensing applications can be given as some examples Koechner, 2003;). In air-borne (and also in space-borne) remote sensing with laser-based lidar and altimetry techniques, such as resonant backscatter lidar, ground vegetation bio-mass/biohealth detection etc., such laser sources could provide a powerful tool for 3-D mapping of atmospheric species and physical attributes, spectral indicators of Earth features and high precision ground topography Eitel, 2011;Lu, 2016;Pelon, 1986;Milton, 1997;Chen, 2014). This would provide a valuable source for understanding the atmospheric science and health of the Earth vegetation and ecological system (Eitel, 2011).…”

Section: Introductionmentioning

confidence: 99%

Wavelength Tunable Passively Q-Switched Alexandrite Laser with Direct Diode-Pumping at 635 nm

Parali

Thomas

Minassian

et al. 2017

Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology

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We report on a wavelength tunable passively Q-switched Alexandrite laser directly red-diode-pumped at 635 nm. Passive Q-switching was achieved with a semiconductor saturable absorber mirror (SESAM) and wavelength tuning with a birefringent tuner. The pulse repetiton rate was variable on the pump power and wavelength and a maximum 27 kHz rate was achieved in fundamental TEM00 mode. The maximum average output power obtained was 41 mW. The Q-switched wavelength tuning band was studied between 740 nm and 755 nm. To the best of our knowledge, this is the first time that tunable TEM00 passive Q-switched operation of a diode-pumped Alexandrite laser has been achieved. The results obtained in this study can be significantly further optimised for performance. A new cavity configuration for this optimisation is described. Future work is expected to lead to the development of higher power, more efficient tunable passive Q-switched (and potentially passive mode-locked) diode-pumped Alexandrite laser sources in the near-infrared band and also ultraviolet region through frequency conversion.

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Atmospheric turbulence induced synthetic aperture lidar phase error compensation

Cited by 6 publications

References 26 publications

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

Diode-pumped Alexandrite laser with passive SESAM Q-switching and wavelength tunability

Wavelength Tunable Passively Q-Switched Alexandrite Laser with Direct Diode-Pumping at 635 nm

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