Dr. Krishnan Venkatakrishnan Profile

Dr. Krishnan Venkatakrishnan

Principle R&D Engineer at XSIL Ltd

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Publications (11)

SPIE Journal Paper | 1 February 2003

Large surface profile measurement with instantaneous phase-shifting interferometry

N. Sivakumar, W. Hui, Krishnan Venkatakrishnan, B. Ngoi

OE, Vol. 42, Issue 02, (February 2003) https://doi.org/10.1117/12.10.1117/1.1532331

KEYWORDS: Phase shifts, Semiconducting wafers, Wave plates, Beam splitters, Polarizers, Cameras, Phase interferometry, Michelson interferometers, Polarization, Speckle

Proceedings Article | 16 January 2003 Paper

Fabrication of binary photomask by femtosecond laser

Paul Stanley, Krishnan Venkatakrishnan, Bryan Ngoi

Proceedings Volume 4981, (2003) https://doi.org/10.1117/12.478173

KEYWORDS: Photomasks, Femtosecond phenomena, Photoresist materials, Laser ablation, Lithography, Microfabrication, Acousto-optics, Quartz, Fabrication, Binary data

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Proceedings Article | 15 January 2003 Paper

Fabrication of planar grating by direct ablation using ultrashort-pulse laser with a novel optical configuration

N. R. Sivakumar, Krishnan Venkatakrishnan, Bo Tan, Bryan Ngoi

Proceedings Volume 4979, (2003) https://doi.org/10.1117/12.478296

KEYWORDS: Pulsed laser operation, Laser ablation, Fabrication, Prisms, Femtosecond phenomena, Ultrafast phenomena, Silicon, Laser damage threshold, Micromachining, Scanning electron microscopy

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SPIE Journal Paper | 1 June 2002

Femtosecond pulsed laser direct writing system

Krishnan Venkatakrishnan, Beng Tan, Paul Stanley, L. E. Lim, Bryan Ngoi

OE, Vol. 41, Issue 06, (June 2002) https://doi.org/10.1117/12.10.1117/1.1476324

KEYWORDS: Femtosecond phenomena, Pulsed laser operation, Laser ablation, Acousto-optics, Laser systems engineering, Laser development, Thin films, Acoustics, Laser processing, Photomasks

SPIE Journal Paper | 1 December 2001

Submicron holes in copper thin film directly ablated using femtosecond pulsed laser

B. Ngoi, Krishnan Venkatakrishnan, Beng Tan

OE, Vol. 40, Issue 12, (December 2001) https://doi.org/10.1117/12.10.1117/1.1419024

KEYWORDS: Copper, Thin films, Femtosecond phenomena, Pulsed laser operation, Laser ablation, Scanning electron microscopy, Laser systems engineering, Oscillators, Communication engineering, Product engineering

SPIE Journal Paper | 1 August 2001

Self-compensation heterodyne vibrometer using an acousto-optic modulator as vibration detector

Bryan Ngoi, Krishnan Venkatakrishnan

OE, Vol. 40, Issue 08, (August 2001) https://doi.org/10.1117/12.10.1117/1.1367343

KEYWORDS: Bragg cells, Vibrometry, Heterodyning, Sensors, Acoustics, Optical testing, Ultrasonics, Laser sources, Interferometry, Beam splitters

SPIE Journal Paper | 1 November 2000

Scanning laser vibrometer for dynamic study of small features

Bryan Ngoi, Krishnan Venkatakrishnan

OE, Vol. 39, Issue 11, (November 2000) https://doi.org/10.1117/12.10.1117/1.1313054

KEYWORDS: Optical testing, Laser Doppler velocimetry, Acousto-optics, Mirrors, Photodetectors, Beam splitters, Signal processing, Doppler effect, Bragg cells, Optical scanning systems

Proceedings Article | 22 May 2000 Paper

Two-axis-scattering laser Doppler vibrometer for microstructures

Bryan Ngoi, Krishnan Venkatakrishnan, Beng Tan, N. Noel, Zuowei Shen, C. Chin

Proceedings Volume 4072, (2000) https://doi.org/10.1117/12.386754

KEYWORDS: Mirrors, Acousto-optics, Atomic force microscopy, Doppler effect, Beam splitters, CCD cameras, Laser optics, Signal processing, Vibrometry, Laser scanners

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Proceedings Article | 22 May 2000 Paper

Noncontact acousto-optic scanning heterodyne laser vibrometer for measurement of dynamics parameter of hard disK

Bryan Ngoi, Krishnan Venkatakrishnan, Beng Tan, C. Chin

Proceedings Volume 4072, (2000) https://doi.org/10.1117/12.386745

KEYWORDS: Beam splitters, Acousto-optics, Mirrors, Laser Doppler velocimetry, Optical testing, Doppler effect, Magnetism, Heterodyning, Lenses, Interfaces

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SPIE Journal Paper | 1 February 2000

Noncontact homodyne scanning laser vibrometer for dynamic measurement

Bryan Ngoi, Krishnan Venkatakrishnan

OE, Vol. 39, Issue 02, (February 2000) https://doi.org/10.1117/12.10.1117/1.602389

KEYWORDS: Acousto-optics, Mirrors, Acoustics, Signal generators, Adaptive optics, Crystals, Homodyne detection, Vibrometry, Control systems, Head

SPIE Journal Paper | 1 December 1999

Techniques to eliminate error induced due to acousto-optic modulator vibration in heterodyne interferometry

Bryan Ngoi, Krishnan Venkatakrishnan

OE, Vol. 38, Issue 12, (December 1999) https://doi.org/10.1117/12.10.1117/1.602310

KEYWORDS: Bragg cells, Heterodyning, Interferometry, Signal generators, Acoustics, Error analysis, Temperature metrology, Vibration isolation, Velocity measurements, Ultrasonics

Showing 5 of 11 publications

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