&lt;title&gt;Efficient accoustic-wave damping in a high-pulse-repetition-rate XeCl laser&lt;/title&gt;

Truong, J. P.; Sentís, M.; Delaporte, Ph.; Forestier, B.; Fontaine, Bernard; Utéza, O.; Tassy, I.

doi:10.1117/12.144681

Cited by 4 publications

(8 citation statements)

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“…3,5 As a trivial solution, an operating regime can be chosen where no acoustic problems manifest themselves, such as at very low repetition rates, with lean gas mixes, or in frequency regions between resonances. The amplitude of the generated acoustic waves can be reduced by spoiling the acoustic resonance conditions; the waves can be attenuated by placing acoustic absorbing materials inside the laser vessel; and the laser can be operated under conditions where it is less susceptible to acoustic disturbances.…”

Section: Suppression Of Acoustic Wavesmentioning

confidence: 99%

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Acoustic waves in transversely excited atmospheric <inline-formula><math display="inline" overflow="scroll"><mrow><msub><mi>CO</mi><mn>2</mn></msub></mrow></math></inline-formula> laser discharges: effect on performance and reduction techniques

Bergmann

Forbes²,

Roberts

et al. 2008

Opt. Eng

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Results are presented on the influence of acoustic waves on the performance of high-repetition-rate TEA CO 2 lasers. It is shown that acoustic waves generated inside the laser cavity lead to nonuniform discharges, resulting in a deterioration of the laser beam quality, decreased output energy, and an increase in pulse-to-pulse energy variation. The effect of the gas mix on the acoustic behavior is investigated, and experimental results on laser performance across a range of gas mixtures are presented. Methods to reduce the effects of acoustic waves are presented together with experimental results. The influence of acoustic damping measures on laser gain are demonstrated, showing a significant improvement in gain and output power at high pulse repetition rates.

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Section: Suppression Of Acoustic Wavesmentioning

confidence: 99%

“…[1][2][3][4][5] In this paper we report on acoustic wave experiments on two unique TEA CO 2 laser systems. All of these applications require high average output power with large pulse energies, generally at high pulse repetition rates.…”

Section: Introductionmentioning

confidence: 99%

Acoustic waves in transversely excited atmospheric <inline-formula><math display="inline" overflow="scroll"><mrow><msub><mi>CO</mi><mn>2</mn></msub></mrow></math></inline-formula> laser discharges: effect on performance and reduction techniques

Bergmann

Forbes²,

Roberts

et al. 2008

Opt. Eng

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“…However, since the gain medium for these systems is a gas mix, and since a large amount of energy is deposited into the gas in a short time frame, acoustic waves and shock waves are always possible obstacles to stable performance. In particular, since the energy is deposited into the cavity at a distinct repetition rate, resonantly enhanced waves can become a problem in some lasers [1][2][3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Influence of acoustic waves on TEA CO 2 laser performance

Bergmann

Forbes

Roberts

et al. 2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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In this paper we present results on the influence of acoustic waves on the output laser beam from high repetition rate TEA CO 2 lasers. We show that acoustic waves generated inside the cavity lead to deterioration in beam quality, decreased output energy, and an increase in pulse to pulse energy variation. We investigate the impact of gas mix on the acoustic behaviour, and present experimental results on laser performance across a range of gas mixtures. Solutions to the acoustic wave problem are presented together with experimental results. The influence of acoustic damping measures on laser gain are demonstrated showing a significant improvement in gain and output power at high repetition rates. The link between the pre-ionisation method employed and the acoustic wave impact on laser performance is discussed.

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“…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] . Consequently, due to the strong energy deposition during the laser pumping process, efficient removal of waste heat and effective damping of shock and acoustic waves must be achieved during the interpulse time.…”

Section: Introductionmentioning

confidence: 99%

“…The short characteristic time of the laser production effect 16 by comparison with those of the flow (t laser << t flow ) indicates that the output energy decrease is induced by the flow perturbations and mainly, by the residual pressure perturbations, remaining in the laser cavity after the strong electric discharge. Previous experimental studies [7][8][9][10] have shown that three types of pressure waves are propagating in the laser cavity. The first family concerns the longitudinal shock waves propagating in the flow direction due to the energy deposition needed to achieve laser pumping in the center of the laser cavity.…”

Section: Introductionmentioning

confidence: 99%

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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<title>Efficient accoustic-wave damping in a high-pulse-repetition-rate XeCl laser</title>

Cited by 4 publications

References 0 publications

Acoustic waves in transversely excited atmospheric <inline-formula><math display="inline" overflow="scroll"><mrow><msub><mi>CO</mi><mn>2</mn></msub></mrow></math></inline-formula> laser discharges: effect on performance and reduction techniques

Acoustic waves in transversely excited atmospheric <inline-formula><math display="inline" overflow="scroll"><mrow><msub><mi>CO</mi><mn>2</mn></msub></mrow></math></inline-formula> laser discharges: effect on performance and reduction techniques

Influence of acoustic waves on TEA CO 2 laser performance

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

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