Surface roughness results using a hydrodynamic polishing tool (HyDra)

Nunez, Manuel; Salinas, Javier; Luna, Esther Martínez; Salas, Luis; Baraza, Elena; Sohn, Erika; Nava, Adriana Palma; Cruz, Irene; Martı́nez, B.

doi:10.1117/12.550573

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…To sustain a decreasing PSD tendency and thus, smaller values of the highfrequency RMS, the use of smaller grit sizes is suggested. Integrating the highfrequency domain of the PSD to obtain the RMS is also equivalent to calculating the RMS directly from a 50 × 50 μm area of the micro-interferogram, according to a standard definition of micro-roughness [16]. This micro roughness obtained with the HyDRa process (3 nm) is comparable to the roughness reported in current FJP literature [5].…”

Section: Polishing Example: Psd and Polishing Of Fabry-perot Etalonsmentioning

confidence: 64%

HyDRa: Vortex Polishing with a Deterministic Hydrodynamic Radial Polishing Tool

Sohn¹,

Luna²,

Baraza³

et al. 2018

Abrasive Technology - Characteristics and Applications

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This work presents the deterministic hydrodynamic polishing system (HyDRa (HyDRa dynamic Radial Polishing Tool) based on a polishing tool developed at the Instituto de Astronomía, UNAM. HyDRa is one of several modern deterministic polishing techniques that allow for computer controlled finishing of complex optical surfaces. The HyDRa system is based on a hydrodynamic polishing tool that generates a variabledensity abra sive flow that makes possible the production of high-quality optical surfaces of diverse materials. The tool comprises several stacked operational stages that generate a graz wing abrasive flow with a predictable, zero-force erosion footprint on the workpiece that removes material. A recent innovation to the hydrodynamic polishing tool adds a switch ing capacity to the tool that allows the polishing action to be interrupted at will, without losing the stability of the operating parameters. This further increases the versatility and performance of the tool, since it is now possible to polish only the areas where the surface needs correction. Pulsed polishing also adds several techniques to this polishing method that further increase the system's versatility.

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Section: Polishing Example: Psd and Polishing Of Fabry-perot Etalonsmentioning

confidence: 64%

HyDRa: Vortex Polishing with a Deterministic Hydrodynamic Radial Polishing Tool

Sohn¹,

Luna²,

Baraza³

et al. 2018

Abrasive Technology - Characteristics and Applications

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“…The RMS obtained by integrating the high-frequency domain of the PSD is also the same as is obtained by calculating the RMS directly from a 50 μm × 50 μm area of the microinterferogram (see Fig. 9), according to a standard definition of microroughness [11]. This microroughness obtained with the HyDRa process is comparable to the roughness reported in current FJP literature [4].…”

Section: Power Spectral Densitymentioning

confidence: 92%

“…At the dawn of the HyDRa project development [10,11], low removal rates and high internal tool wear were common. The importance of some operational parameters was still under investigation.…”

Section: Tool Characterizationmentioning

confidence: 99%

HyDRa: polishing with a vortex

et al. 2013

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We present a hydrodynamic, deterministic polishing tool (HyDRa) based on the fluid-jet polishing (FJP) principle. In contrast to other FJP methods, the polishing flux is accelerated with pressurized air and then expelled at high velocity, forming a radial, grazing abrasive pattern that exerts no net force of the tool on the surface to be polished, since the vacuum and thrust forces that are created at the tool's output balance each other out. The grazing effect minimizes microroughness, making it appropriate for finishing high-quality surfaces. The principle of operation as well as polishing results of a series of small etalon plates are presented.

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New perspectives in hydrodynamic radial polishing techniques for optical surfaces

Baraza

Sohn

Luna

et al. 2004

Optical Fabrication, Metrology, and Material Advancements for Telescopes

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In order to overcome classic polishing techniques, a novel hydrodynamic radial polishing tool (HyDRa) is presented; it is useful for the corrective lapping and fine polishing of diverse materials by means of a low-cost abrasive flux and a hydrostatic suspension system that avoids contact of the tool with the working surface. This tool enables the work on flat or curved surfaces of currently up to two and a half meters in diameter. It has the advantage of avoiding fallen edges during the polishing process as well as reducing tool wear out and deformation. The functioning principle is based on the generation of a high-velocity, high-pressure, abrasive emulsion flux with radial geometry. The polishing process is repeatable by means of the control of the tool operational parameters, achieving high degrees of precision and accuracy on optical and semiconductor surfaces, with removal rates of up to 9 mm3/hour and promising excellent surface polishing qualities. An additional advantage of this new tool is the possibility to perform interferometric measurements during the polishing process without the need of dismounting the working surface. A series of advantages of this method, numerical simulations and experimental results are described.

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Surface roughness results using a hydrodynamic polishing tool (HyDra)

Cited by 4 publications

References 3 publications

HyDRa: Vortex Polishing with a Deterministic Hydrodynamic Radial Polishing Tool

HyDRa: Vortex Polishing with a Deterministic Hydrodynamic Radial Polishing Tool

HyDRa: polishing with a vortex

New perspectives in hydrodynamic radial polishing techniques for optical surfaces

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