&lt;title&gt;Repetitively pulsed HF chemical laser with high average power&lt;/title&gt;

Brunet, H.; Mabru, Michel; Vannier, C.

doi:10.1117/12.144647

Cited by 3 publications

(8 citation statements)

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“…This is inherently due to the new propagation direction of the shock waves offered by the side effect of the electrodes. Then, after 0.5 ms, the pressure gauge corresponds to the numerous reflections of the cylindrical shock waves on the optics, Figure 8, and which have also been experimentally put in evidence in both chemical and excimer lasers 2,10 . Consequently, the magnitude of the pressure peaks decreases slowly in time and consists in the reverberation process of the waves.…”

Section: Numerical Study Of 2d and 3d Flowfields 35mentioning

confidence: 76%

“…One can clearly see on this diagram the inlet and outlet sections of the cavity which allow the correct clearing of the laser cavity discharge volume by a subsonic flow recirculation gas loop, the shape of the lower anode which permits to accelerate the flow in the discharge volume with characteristic length is (L*h*L z ), and the location of a pressure gauge. For more details on this device see Reference 2 .…”

Section: Physical Problem and Theoretical Modelmentioning

confidence: 99%

“…On one hand, from the analysis of experimental results obtained in multidischarge operating mode with both chemical 2,15 and excimer 8-10 lasers, one can mainly notice the asymptotic rise of the pressure in the cavity, which finally reaches a maximum level. This maximum level seems to be characteristic of the laser device employed.…”

Section: Limitations Of the 2d Approachmentioning

confidence: 99%

“…Chemical lasers convert directly chemical energy into coherent radiation and are expected to be the most efficient and compact type of lasers in terms of cost per photon and of ratio of power to weight and volume 1 . Moreover, HF and DF pulsed chemical lasers, based on the electrical dissociation of SF 6 , are very attractive because they use gases easy to handle, which are not corrosive and there is no risk of premature ignition 2 . In a high repetition pulsed mode, it is well known that to get a high quality output laser beam, it is necessary that the flow in the laser discharge zone recovers its homogeneity before the next pulse is started [3][4][5][6][7][8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

“…As concerns the numerical resolution of the above equation set (1)(2)(3)(4), they are all treated with sequential one-dimensional solvers based on flux-corrected transport algorithms which are presented in the next section.…”

mentioning

confidence: 99%

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Numerical study of 2D and 3D flowfields in a high‐power pulsed chemical laser

Vuillon

Zeitoun²

1997

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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High‐power chemical lasers operating in high repetitive rate show a decrease of the output energy laser beam. In such lasers, the characteristic time which depends on the laser output is short in comparison with those related to the flow. Consequently, shock waves, acoustic waves and thermal perturbations, induced by the strong electric energy deposition and remaining in the laser cavity between two pulses, may explain the decrease of output energy of the laser beam. For a better understanding of the flowfields, a numerical approach is carried out using flux corrected transport algorithms (FCT methods) associated with a Riemann solver on the computational domain boundaries. Under two‐dimensional assumptions, the inviscid flow in the convergent‐divergent laser cavity is computed to describe the creation and propagation of the wave system and the hot gas column in both single and multidischarge operating modes. Distortions of the contact surfaces are put into evidence through the study of flowfield instabilities. Finally, the limitations of the two‐dimensional modelization become apparent. The numerical resolution is extended to a 3D case in order to take into account the optical direction. This allows to study the influence of shock waves travelling between optics and being generated by a side effect developing at the electrodes. These waves have an effect of long duration on the flowfield and lead to a high residual perturbation level.

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Section: Numerical Study Of 2d and 3d Flowfields 35mentioning

confidence: 76%

Section: Physical Problem and Theoretical Modelmentioning

confidence: 99%

Section: Limitations Of the 2d Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Numerical study of 2D and 3D flowfields in a high‐power pulsed chemical laser

Vuillon

Zeitoun²

1997

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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3.6 Gasdynamical lasers, chemical lasers

Hugenschmidt

Laser Systems, Part 1

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Pulse energy sustainability of a burst mode closed-cycle pulsed HF chemical laser

Tao¹,

Shen²,

Zhu³

et al. 2019

Laser Phys.

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Pulse energy sustainability of a burst mode closed-cycle pulsed HF laser is investigated with a simple theoretical model considering gas replenishment and chemical scrubbing. The effects of reactant gas consumption and de-excitation of excited HF by ground state HF are studied quantitatively. Also, experiments are carried out for comparison and validation. Simulation and experiments show that, in the burst mode operation, the energy loss caused by gas consumption is about 0.06-0.12 mJ per pulse while that induced by the de-excitation process is about 0.22-0.29 mJ per pulse, demonstrating that chemical scrubbing should play a more important role in the energy preservation of non-chain pulsed HF lasers.

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<title>Repetitively pulsed HF chemical laser with high average power</title>

Cited by 3 publications

References 0 publications

Numerical study of 2D and 3D flowfields in a high‐power pulsed chemical laser

Numerical study of 2D and 3D flowfields in a high‐power pulsed chemical laser

3.6 Gasdynamical lasers, chemical lasers

Pulse energy sustainability of a burst mode closed-cycle pulsed HF chemical laser

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