Optical Quality Diamond Grown by Chemical Vapor Deposition

Friel, I.

doi:10.1002/9783527648603.ch2

Cited by 12 publications

(8 citation statements)

References 82 publications

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“…Because diamond is a brittle material, its fracture properties are extremely sensitive to initial cracks, flaws and related microstructural elements [7][8][9]. In addition, the cost and inherent small sizes of single-crystal diamond make taking statistically relevant measurements to determine Weibull distributions challenging.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the wide range of microstructures observed in CVDgrown diamond coupled to a dependence of mechanical properties on film thickness creates a different set of experimental challenges in determining inherent fracture properties of diamond. For example, measurements on single-crystal CVD-grown diamond samples yielded a mean strength of 2860 MPa, with a standard deviation and maximum value of 1200 MPa and 5100 MPa, respectively [4,7]. The fracture strength measured for CVD-grown polycrystalline samples has been found to be substantially smaller than single crystals, with a relatively large dependence on film thickness and growth orientation [10].…”

Section: Introductionmentioning

confidence: 99%

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Theory and modelling of diamond fracture from an atomic perspective

Brenner

Shenderova

2015

Phil. Trans. R. Soc. A.

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Discussed in this paper are several theoretical and computational approaches that have been used to better understand the fracture of both single-crystal and polycrystalline diamond at the atomic level. The studies, which include first principles calculations, analytic models and molecular simulations, have been chosen to illustrate the different ways in which this problem has been approached, the conclusions and their reliability that have been reached by these methods, and how these theory and modelling methods can be effectively used together.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory and modelling of diamond fracture from an atomic perspective

Brenner

Shenderova

2015

Phil. Trans. R. Soc. A.

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“…Although diamond is nominally an isotropic crystal, in-grown defects give rise to internal stresses that result in substantial birefringence (Δn > 10 −4 [67]). Quality of synthetic diamond has improved over the last decade [68], [69] and CVD-grown samples with uniform low birefringence of Δn < 10 −5 are now readily available. The effects of birefrin-gence on DRLs with high-finesse cavities have been analyzed in detail [70], and include perturbations to the Stokes polarization and gain reduction.…”

Section: Table I Thermal and Nonlinear Effects In End-pumped Lasersmentioning

confidence: 99%

High Power Diamond Raman Lasers

Williams

Kitzler

Bai

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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Laser gain materials possessing high thermal conductivity and robust mechanical properties are key prerequisites for high power lasers. We show that diamond, when configured as a Raman laser, enables access to these and other extreme properties, providing an important new route to high power and high brightness beam generation. Recent achievements in pulsed and continuous wave oscillators, beam combining amplifiers, and single longitudinal mode oscillators are summarized, along with wavelength extension of these concepts through adaption to other pumps, use of Raman cascading, and intracavity harmonic generation. To date, diamond laser powers have attained 750 W with efficiency and beam quality so far unperturbed by nonlinear or thermally induced side-effects. Large factor brightness enhancement of low coherence inputs is demonstrated using multiple pump beams (via Raman beam combination) or highly multimode pumps for oscillator and amplifier configurations. Future directions for direct diode pumping, and for realizing extraordinary power and power density through reduced temperature operation and isotopically enriched diamond, are also discussed. Our results indicate that diamond is emerging as a generic high-power laser technology with advantages in terms of brightness (high average power and high beam quality) and wavelength range.

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“…Although synthetic diamonds have been manufactured by various processes for more than half a century, advances in recent years have made it possible to produce gem-quality synthetic diamonds of significant size. It is possible to make synthetic gemstones that, on a molecular level [7], are identical to natural stones and so visually similar that only an expert with special equipment can tell the difference.…”

Section: Future Trendsmentioning

confidence: 99%

Cool Laser for Cutting Diamonds

Shankar¹

2015

Laser Technik Journal

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Diamond cutters have been looking for a laser cutting tool that can slice through a diamond without causing any thermal damage.Raw diamonds can contain inclusions in the form of non‐diamond hybrid materials or air bubbles, making them susceptible to damage from intense heat during laser cutting. The heat of a conventional laser beam can cause the inherent material tension in such inclusions to explode the stone. Thus, a rough diamond worth several thousands of dollars can literally be reduced to worthless bits in a matter of seconds without any warning.

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Optical Quality Diamond Grown by Chemical Vapor Deposition

Cited by 12 publications

References 82 publications

Theory and modelling of diamond fracture from an atomic perspective

Theory and modelling of diamond fracture from an atomic perspective

High Power Diamond Raman Lasers

Cool Laser for Cutting Diamonds

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