Material and medical applications using a 20-W frequency-doubled Nd:YAG laser

Fahlen, T. S.; Perkins, Patrick

doi:10.1364/cleo.1984.thc1

Cited by 5 publications

(4 citation statements)

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“…The secondary lobe requires that 6 = 1.5 ~/ 1 0 (14) and 15 < qo < 40 (15) Clearly, the maximum efficiency in the secondary lobe is less than that in the central lobe. The efficiency achieved depends on the details of the spatial and temporal character of the drive.…”

Section: ( 7 )mentioning

confidence: 99%

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High average power harmonic generation

Eimerl

1987

IEEE J. Quantum Electron.

142

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High average power frequency conversion using solid-state nonlinear materials is discussed. Recent laboratory experience and new developments in design concepts show that current technology, a few tens of watts, may be extended by several orders of magnitude. For example, using KD*P, efficient doubling (> 70 percent) of Nd:YAG at average powers approaching 100 KW is possible; for doubling to the blue or UV regions the average power may approach 1 MW. Configurations using segmented apertures permit essentially unlimited scaling of average power. High average power is achieved by configuring the nonlinear material as a set of thin plates with a large ratio of surface area to volume, and cooling the exposed surfaces with a flowing gas. The design and material fabrication of such a harmonic generator is well within current technology. F INTRODUCTION REQUENCY conversion is a useful technique for extending the utility of high power lasers. It utilizes the nonlinear optical response of an optical medium in intense light fields to generate new frequencies. Frequency doubling, tripling, and quadrupling generate a single harmonic from a given fundamental high power source. The closely related processes of sum and difference frequency generate also generate a single new wavelength, but require two high power sources. These techniques have been used to generate high power radiation in all spectral regions, from the UV to the far-IR. Optical parametric oscillators and amplifiers generate two waves of lower frequency. They are capable of 'generating a range of wavelengths from a single .frequency source, in some cases spanning the entire visible, and near-infrared regions. The materials used for frequency conversion are often also suitable for other devices, such as electrooptic Manuscript

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Section: ( 7 )mentioning

confidence: 99%

“…Geusic [ 151 reports using (noncritically phase-matched) Ba2NaNb5OI5 to convert effectively 100 percent of the fundamental to the second harmonic. The average power was nominally 1 W. More recently, Perkins [14], [42] reports using KTiOP04 for intracavity doubling, obtaining 25 W of average power.…”

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confidence: 99%

High average power harmonic generation

Eimerl

1987

IEEE J. Quantum Electron.

142

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“…Experiments utilizing KTP as an intracavity doubler for a quasi-cw Nd:YAG laser have demonstrated that power outputs in excess of 25 W could be generated without damage for 3 mm X 3 mm X 5 mm KTP crystals. 7 Extracavity doubling experiments with KTP have also been encouraging. As much as 60% conversion efficiency of a TEMOO mode fundamental has been reported, 8 and greater than 50% conversion of a multimode beam has been demonstrated.…”

Section: Introductionmentioning

confidence: 95%

“…5 The last-named property is highly advantageous for maintaining pulsed energy stability of the converted beam. Recent experiments 6 ' 7 have also shown KTP to be a long-lived nonlinear material not susceptible to statistical bulk damage, as in MgO:LiNbO 3 , for example, even at relatively highaverage-power levels. Experiments utilizing KTP as an intracavity doubler for a quasi-cw Nd:YAG laser have demonstrated that power outputs in excess of 25 W could be generated without damage for 3 mm X 3 mm X 5 mm KTP crystals.…”

Section: Introductionmentioning

confidence: 99%

Efficient second-harmonic generation in KTP crystals

Hoffman²,

et al. 1986

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Conversion efficiencies in excess of 50% have been measured in frequency-doubling experiments in KTP using divergent fundamental 1.064-,um beams. Various doubling schemes have been investigated to avoid reconversion effects observed in 9-mm-long crystals. The phase-matching angular acceptance bandwidth, damage-threshold observations, and a measurement of effective susceptibility relative to KD*P are also reported.

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Sources, Optics, and Laser Microfabrication Systems for Direct Writing and Projection Lithography

Liu¹

1989

Laser Microfabrication

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Material and medical applications using a 20-W frequency-doubled Nd:YAG laser

Cited by 5 publications

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High average power harmonic generation

High average power harmonic generation

Efficient second-harmonic generation in KTP crystals

Sources, Optics, and Laser Microfabrication Systems for Direct Writing and Projection Lithography

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