100-ps-pulse-duration, 100-J burst-mode laser for kHz–MHz flow diagnostics

Roy, Sukesh; Miller, Joseph D.; Slipchenko, Mikhail N.; Hsu, Paul S.; Mance, Jason; Meyer, Terrence R.; Gord, James R.

doi:10.1364/ol.39.006462

Cited by 55 publications

(12 citation statements)

References 23 publications

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“…A 250 mW output beam, exhibiting Gaussian circular profile, is obtained starting from a 1.4 mW seed input at 1 kHz. Yb:YAG amplifiers represents a valuable alternative to Nd:YAG systems that are commonly used to amplify picosecond pulses [43]. This latter, in fact, provide high amplification factor, but the spectral width of the gain band is narrow and centered at 1064 nm, which is not compatible with the ultrashort pulse generation (< 200 fs) needed for the first stage of the experiment.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast background-free ro-vibrational fs/ps-CARS thermometry using an Yb:YAG crystal-fiber amplified probe

Santagata¹,

Scherman²,

Toubeix³

et al. 2019

Opt. Express

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A novel laser system for ro-vibrational spectroscopy using coherent anti-Stokes Raman Scattering in hybrid fs/ps regime is presented. A single Yb:KGW laser source is used as a master laser to generate the three CARS laser beams, namely the pump and Stokes femtosecond pulses and a 58 ps probe pulse. Master oscillator power amplifier (MOPA) architecture is implemented to increase the probe output power using a custom two stage free space linear amplifier. The probe is 0.37 cm −1 in width and 100 µJ in energy to allow resolving the Q-branch ro-vibrational lines of N 2 and recording single shot CARS spectra at kHz repetition rate in flames. An original and simple technique based on the study of the influence of probe delay and polarization has been setup to optimize nonresonant background rejection, with no loss in resonant contribution. CARS performances are reported for N 2 thermometry between 300 K and 3000 K, demonstrating state of the art precision.

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Section: Methodsmentioning

confidence: 99%

Ultrafast background-free ro-vibrational fs/ps-CARS thermometry using an Yb:YAG crystal-fiber amplified probe

Santagata¹,

Scherman²,

Toubeix³

et al. 2019

Opt. Express

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“…Furthermore, in recent years efforts have been made to move the development of BML towards generating pulses with shorter durations that have the ability to produce intense pulses up to megahertz repetition rates. The short-pulse BML will pave the way for high-speed (>100 kHz) diagnostics of turbulent reacting and nonreacting flows [72,110]. Such capabilities with high-energy and high-bandwidth lasers would be extremely useful for investigating transient and turbulent flows.…”

Section: Comparison Of Ns Ps and Fs-laser-based Imaging-their Similmentioning

confidence: 99%

“…Reproduced with permission from [158]. up to megahertz [72]. The high-energy BML has enabled 3D measurements of LIF in reacting flows and also extended to 4D with temporal evolution recorded [111,112].…”

Section: Kilohertz-to Megahertz-rate Sourcesmentioning

confidence: 99%

“…By temporally delaying the probe pulse in ps-VCARS, the Raman-coherence lifetimes of the rotationally resolved Q-branch transitions of H 2 have been directly measured [205]; also, the temperature has been extracted [206]. The high-speed capabilities of ps-VCARS have been significantly enhanced with the advent of the BML [72]. For example, gas-phase thermometry at a 100 kHz repetition rate has been demonstrated using ps-VCARS of H 2 in an H 2 -air flame stabilized over a Hencken burner [110].…”

Section: Vibrational Cars (Ps Fs Fs/ps)mentioning

confidence: 99%

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Recent advances in ultrafast-laser-based spectroscopy and imaging for reacting plasmas and flames

Patnaik

Adamovich

Gord

et al. 2017

Plasma Sources Sci. Technol.

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Reacting flows and plasmas are prevalent in a wide array of systems involving defense, commercial, space, energy, medical, and consumer products. Understanding the complex physical and chemical processes involving reacting flows and plasmas requires measurements of key parameters, such as temperature, pressure, electric field, velocity, and number densities of chemical species. Time-resolved measurements of key chemical species and temperature are required to determine kinetics related to the chemical reactions and transient phenomena. Laser-based, noninvasive linear and nonlinear spectroscopic approaches have proved to be very valuable in providing key insights into the physico-chemical processes governing reacting flows and plasmas as well as validating numerical models. The advent of kilohertz rate amplified femtosecond lasers has expanded the multidimensional imaging of key atomic species such as H, O, and N in a significant way, providing unprecedented insight into preferential diffusion and production of these species under chemical reactions or electric-field driven processes. These lasers not only provide 2D imaging of chemical species but have the ability to perform measurements free of various interferences. Moreover, these lasers allow 1D and 2D temperature-field measurements, which were quite unimaginable only a few years ago. The rapid growth of the ultrafast-laser-based spectroscopic measurements has been fueled by the need to achieve the following when measurements are performed in reacting flows and plasmas. They are: (1) interference-free measurements (collision broadening, photolytic dissociation, Stark broadening, etc), (2) timeresolved single-shot measurements at a rate of 1-10 kHz, (3) spatially-resolved measurements, (4) higher dimensionality (line, planar, or volumetric), and (5) simultaneous detection of multiple species. The overarching goal of this article is to review the current state-of-the-art ultrafast-laserbased spectroscopic techniques and their remarkable development in the past two decades in meeting one or all of the above five goals for the spectroscopic measurement of temperature, number density of the atomic and molecular species, and electric field.

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“…Bandwidth limited laser amplifiers down to 100 ps were demonstrated including intra‐cavity volume Bragg gratings (VBG) or etalons for a fixed wavelength. Narrow bandwidth Yb:YAG thin‐disk lasers including a grating‐waveguide structure were introduced in continuous‐wave operation while ps systems with an average power of up to 1 kW are linked to ultra‐short pulse applications.…”

Section: Introductionmentioning

confidence: 99%

High energy Yb:YAG active mirror laser system for transform limited pulses bridging the picosecond gap

Siebold

Loeser

Röser

et al. 2016

Laser & Photonics Reviews

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A diode-pumped Yb:YAG MOPA-System for the unprecedented generation of transform limited pulses with variable pulse duration in the range between 10 ps and 100 ps is presented. First applications relying on unique pulse parameters as modulation free spectrum, tunability and coherence length, namely the direct laser interference patterning (DLIP) and laser cooling of stored relativistic ion beams are highlighted. Pulses are generated by a mode-locked fs-oscillator while the spectral bandwidth is narrowed in the subsequent regenerative amplifier by an intra-cavity grating monochromator. Two alternative booster amplifiers were added to increase the pulse energy to 100 μJ and 10 mJ, respectively

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100-ps-pulse-duration, 100-J burst-mode laser for kHz–MHz flow diagnostics

Cited by 55 publications

References 23 publications

Ultrafast background-free ro-vibrational fs/ps-CARS thermometry using an Yb:YAG crystal-fiber amplified probe

Ultrafast background-free ro-vibrational fs/ps-CARS thermometry using an Yb:YAG crystal-fiber amplified probe

Recent advances in ultrafast-laser-based spectroscopy and imaging for reacting plasmas and flames

High energy Yb:YAG active mirror laser system for transform limited pulses bridging the picosecond gap

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