Operation and beam profiling of an up to 200 kHz pulse-burst laser for Thomson scattering

Young, W. C.; Hartog, D. J. Den

doi:10.1063/1.4885539

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…This energy was measured close to the output of the fifth amplifier. Later testing [6] found that the beam defocused over the sequence of several bursts, to the point the third burst produced insufficient scattered light for temperature measurements. The behavior was consistent with uneven heating of the laser rods, with more heating of the outer radii of the rod resulting in the rod behaving as a diverging lens.…”

Section: Nd:glass Doping Concentrationmentioning

confidence: 99%

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Thomson scattering at 250 kHz

Young

Hartog

2015

J. Inst.

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A: Several upgrades have been applied to the high-repetition-rate Thomson scattering diagnostic on the MST experiment, having increased the rate and number of electron temperature measurements. The detector portion of the Thomson scattering system requires 1.5-2.0 J, 10-20 ns laser pulses at 1064 nm. A high-repetition-rate laser produces suitable pulses for short 3-4 pulse bursts with only 3 µs pulse spacing. Alternatively, the laser timing can be optimized to maximize the number of pulses in a single burst, producing up to 44 pulses at a rate of 100 kHz. The laser follows a master oscillator, power amplifier architecture. Upgrades to the laser include: a new acousto-optic modulator chopped CW laser based master oscillator, a sixth power amplifier, optimized Nd doping within Nd:glass amplifiers via optical modeling of the pump chamber, and a yet to be installed new cavity reflector. Additionally, a new long wavelength filter has been added to the Thomson scattering diagnostic's polychromator based detector, allowing possible detection of net electron drift. K: Lasers; Nuclear instruments and methods for hot plasma diagnostics 1Corresponding author.

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Section: Nd:glass Doping Concentrationmentioning

confidence: 99%

“…The fast laser utilizing some of the same control systems and power supplies as the previous pulse-burst laser, but with a larger configuration. Previous works [5,6] discuss the early development of this laser and testing a partial implementation utilizing five out of six planned amplifiers.…”

mentioning

confidence: 99%

Thomson scattering at 250 kHz

Young

Hartog

2015

J. Inst.

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“…Pulse-burst laser technology has also been applied to high-temperature plasma diagnostics, specifically Thomson scattering measurements [6,7]. A master oscillator, power amplifier (MOPA) configuration has been used to produce 1-2 J pulses at repetition rates up to 200 kHz [8]. However, the diode-pumped Q-switched Nd:YVO 4 master oscillator in this system has several drawbacks.…”

Section: Introductionmentioning

confidence: 99%

A flexible master oscillator for a pulse-burst laser system

Hartog

Young²

2015

J. Inst.

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A new master oscillator is being installed in the pulse-burst laser system used for highrep-rate Thomson scattering on the MST experiment. This new master oscillator will enable pulse repetition rates up to 1 MHz, with the ability to program a burst of pulses with arbitrary and varying time separation between each pulse. In addition, the energy of each master oscillator pulse can be adjusted to compensate for gain variations in the power amplifier section of the laser system. This flexibility is accomplished by chopping a CW laser source with a high-bandwidth acousto-optic modulator (AOM). The laser source is a Laser Quantum ventus 1064 diode-pumped solid-state laser with continuous output power variable from 100 to 500 mW. The 1064 nm, 2.7 mm diameter polarized beam is focused into the gallium phosphide crystal of a Brimrose AOM, which deflects the beam by approximately 60 mR when driven by the 400 MHz fixed frequency driver. Beam deflection is controlled by a simple digital input pulse, and is capable of producing deflected pulses of less than 20 ns width at repetition rates much greater than 1 MHz. These deflected pulses from the output of the AOM are collimated and propagated into the laser amplifier system, where they will be amplified to ∼2 J/pulse and injected into the MST plasma.

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Upgrade of Thomson scattering system on VEST

Kim

Lee

et al. 2019

Fusion Engineering and Design

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Operation and beam profiling of an up to 200 kHz pulse-burst laser for Thomson scattering

Cited by 5 publications

References 7 publications

Thomson scattering at 250 kHz

Thomson scattering at 250 kHz

A flexible master oscillator for a pulse-burst laser system

Upgrade of Thomson scattering system on VEST

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