Compact burst-mode Nd:YAG laser for kHz–MHz bandwidth velocity and species measurements

Smyser, Michael E.; Rahman, Kazi Arafat; Slipchenko, Mikhail N.; Roy, Sukesh; Meyer, Terrence R.

doi:10.1364/ol.43.000735

Cited by 31 publications

(7 citation statements)

References 20 publications

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“…Imaging distortion from phase delays was minimized by passing a coherent beam through shock-wave distortion and reflecting it off a phase conjugate mirror to propagate it through the shock-wave again. The holograms were recorded at up to 5 million fps by using an ultrahigh-speed camera and operating a pulse-burst laser [33] at 5 MHz.…”

Section: Jinst 17 P08019mentioning

confidence: 99%

100 megahertz-rate ultrahigh-speed digital holography instrument

Mansoor

George²

2022

J. Inst.

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This work presents the development of an ultrahigh-speed digital holography instrument that can perform volumetric measurements at a rate of up to 100 million frames per second. The system is based on an Ultra 8 camera that uses a single custom-built image intensifier with a segmented photocathode that can gate eight different imaging regions down to 10 ns. An in-line interferometric scheme is used to capture the deformation of a water drop as it is photoablated from irradiation by a 1064 nm wavelength pulsed laser beam. After a digital holographic video is captured, wavefront reconstruction is used to focus on discrete depth planes enabling the user to observe different 3-dimensional features of the drop as the field-of-view is scanned plane-by-plane. The reconstructions are detwinned and corrected for parallax and alignment error before a final image at any given depth is produced. We provide one-to-one comparisons between conventional focused imaging and digital holography to demonstrate the 3-dimensional visualization capabilities of the instrument with particular regard to dynamic events occurring at nanosecond time intervals for future applications to hypersonic flows and other short and ultrashort duration events.

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Section: Jinst 17 P08019mentioning

confidence: 99%

100 megahertz-rate ultrahigh-speed digital holography instrument

Mansoor

George²

2022

J. Inst.

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“…The emerging burst-mode method has the capacity to generate high-rate and high-energy pulsed lasers at a lower duty cycle for effective thermal relaxation by grouping a series of sequential pulses into the envelope over a limited duration. This approach corresponds to method for measuring burst-mode laser-based high-rate field parameters illustrated in [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Pre-Shaped Burst-Mode Hybrid MOPA Laser System at 10 kHz Pulse Frequency

Zhang

Peng

et al. 2023

Sensors

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A temporal pre-shaped burst-mode hybrid fiber-bulk laser system was illustrated at a 10 kHz rate with a narrow spectral linewidth. A theoretical model was proposed to counteract the temporal profile distortion and compensate for the desired one, based on reverse process of amplification. For uniformly modulated injection, amplified shapes were recorded and investigated in series for their varied pulse duration, envelope width and amplification delay, respectively. The pre-shaped output effectively realized a uniform distribution on a time scale for both the burst envelope and pulse shape under the action of the established theoretical method. Compared with previous amplification delay methods, this model possesses the capacity to extend itself for applications in burst-mode shaping with variable parameters and characteristics. The maximum pulse energy was enlarged up to 9.68 mJ, 8.94 mJ and 6.57 mJ with a 300 ns pulse duration over envelope widths of 2 ms to 4 ms. Moreover, the time-averaged spectral bandwidths were measured and characterized with Lonrentz fits of 68.3 MHz, 67.2 MHz and 67.7 MHz when the pulse duration varied from 100 ns to 300 ns.

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“…The parameter measurements (e.g., temperature, velocities, and mixture fraction) for high-speed flows have greatly boosted the advancements of aerospace and scramjet by use of optical imaging techniques [1][2][3][4][5][6]. Especially, the solid-state laser system, with a high rate and high energy [7][8][9][10][11], has great potential for optical diagnostic applications, such as planar laser-induced fluorescence (PLIF) [12][13][14], particle imaging velocimetry (PIV) [15,16], and filtered Rayleigh scattering (FRS) [17,18]. Among those measuring techniques, FRS serves as a promising approach in imaging high-speed reacting flames and non-reacting jets for its strong suppression in background noise, with the same wavelength as an input laser, from the Mie scattering and windows and highlights weaker broadened Rayleigh-Brillouin scattering (RBS) signal intensity.…”

Section: Introductionmentioning

confidence: 99%

100 kHz Narrow-Linewidth Burst-Mode MOPA Laser System With Uniform Envelope

Zhang

Peng

et al. 2022

Front. Phys.

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In this study, a 100-kHz narrow-linewidth burst-mode laser system combined with a master oscillator power amplifier (MOPA) structure was reported with a stable pulse burst profile over 2 ms duration. A theoretical model was established to characterize and compensate the variation characteristics of coefficient of variation (COV) within a burst envelope for the double-pass three-stage amplification system, in terms of different parameter factors. Simulated results yielded similar tendency with the measured ones. For a stable burst envelope with a COV of 2.72% and 2.93%, output pulse energy at a 100 kHz repetition rate was scaled up to 1.08 and 4.38 mJ in the case of an input average pulse energy of 8.6 and 116.51 nJ, respectively. Corresponding Mx2 and My2 values with 2.2 and 2.4 were endowed with 1.08 mJ output single-pulse energy and 2.7 and 2.1 for 4.38 mJ pulse energy. The spectral linewidth of amplified pulses was measured to be less than 83.1 and 67.9 MHz, with respect to output pulse duration of 10.3 and 96.1 ns, respectively.

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Compact burst-mode Nd:YAG laser for kHz–MHz bandwidth velocity and species measurements

Cited by 31 publications

References 20 publications

100 megahertz-rate ultrahigh-speed digital holography instrument

100 megahertz-rate ultrahigh-speed digital holography instrument

Pre-Shaped Burst-Mode Hybrid MOPA Laser System at 10 kHz Pulse Frequency

100 kHz Narrow-Linewidth Burst-Mode MOPA Laser System With Uniform Envelope

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