Dr. Hemashilpa Kalagara Profile

Dr. Hemashilpa Kalagara

Staff Laser Engineer at Lumentum

SPIE Involvement:

Author

Area of Expertise:

Semiconductor Lasers , Optoelectronics , injection locking of semiconductor ring lasers , physics and simulation of optoelectronic devices , nonlinear optics , nonlinear effects in semiconductor lasers

Websites:

Company Website

Research and development of different semiconductor lasers for consumer electronics, automotive and industrial applications. The research and development work involves mask design, fabrication, characterization, and test data analysis and transitioning prototypes to mass production.

Proceedings Article | 13 March 2024 Presentation + Paper

High speed characterization of 1D-addressable multi-channel VCSELs with SPAD arrays for automotive LIDAR

Hemashilpa Kalagara, Ben Kesler, Eric Hegblom, Preethi Dacha, Matthew Peters, Guowei Zhao, Jun Yang, Daniel Shi, Kevin Yu

Proceedings Volume 12904, 129040G (2024) https://doi.org/10.1117/12.3015301

KEYWORDS: Vertical cavity surface emitting lasers, LIDAR, Anodes, Detector arrays, Temperature metrology, Design, Lens arrays, Sensors, Semiconducting wafers, Resistance

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Proceedings Article | 15 March 2023 Presentation + Paper

1D-addressable multi-channel VCSELs with SPAD arrays for short- to medium-range LiDARs

Hemashilpa Kalagara, Eric Hegblom, Ben Kesler, Matthew Peters, Guowei Zhao, Jun Yang, Mike Dolganov, Daniel Shi, Kevin Yu

Proceedings Volume 12439, 124390A (2023) https://doi.org/10.1117/12.2668729

KEYWORDS: Vertical cavity surface emitting lasers, LIDAR, Autonomous driving

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Proceedings Article | 28 March 2022 Presentation + Paper

Very compact multi-junction VCSEL arrays

Hemashilpa Kalagara, Guowei Zhao, Jun Yang, Benjamin Kesler, Mohammad Ali Shirazi, Mahdad Mansouree, Qianhuan Yu, Matthew Peters

Proceedings Volume 12020, 1202002 (2022) https://doi.org/10.1117/12.2614461

KEYWORDS: Vertical cavity surface emitting lasers, LIDAR, Three dimensional sensing, Temperature metrology, Sensing systems, Oxidation, Near field optics, Near field, Internet, Consumer electronics

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Proceedings Article | 23 February 2018 Paper

Structure-induced asymmetry between counterpropagating modes in three-port couplers

Marek Osiński, Hosuk Lee, Hemashilpa Kalagara, Gennady Smolyakov

Proceedings Volume 10526, 1052615 (2018) https://doi.org/10.1117/12.2295234

KEYWORDS: Waveguides, Finite-difference time-domain method, Refractive index, Light wave propagation, Wave propagation, Geometrical optics, 3D modeling, Numerical analysis, Semiconductor lasers, Maxwell's equations

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Proceedings Article | 11 September 2017 Paper

Structure-induced asymmetry between counterpropagating modes and the reciprocity principle in whistle-geometry ring lasers

Marek Osiński, Hemashilpa Kalagara, Hosuk Lee, Gennady Smolyakov

Proceedings Volume 10345, 1034520 (2017) https://doi.org/10.1117/12.2274604

KEYWORDS: Waveguides, Semiconductor lasers, Modulation, Finite-difference time-domain method, Refractive index, Vertical cavity surface emitting lasers, Continuous wave operation, Resonance enhancement, Laser optics, Semiconductors

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Proceedings Article | 22 March 2016 Paper

Reciprocity principle and nonequivalence of counterpropagating modes in whistle-geometry ring lasers

Hemashilpa Kalagara, Fei-Hung Chu, Gennady Smolyakov, Marek Osiński

Proceedings Volume 9742, 974213 (2016) https://doi.org/10.1117/12.2214602

KEYWORDS: Semiconductor lasers, Modulation, Waveguides, Modulators, Finite-difference time-domain method, Refractive index, Vertical cavity surface emitting lasers, Semiconductors, Polymers

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Proceedings Article | 21 March 2014 Paper

Numerical modeling of improvement in slope sensitivity of InGaN-based ring laser rotation sensor

Hemashilpa Kalagara, Petr Eliseev, Marek Osinski

Proceedings Volume 8980, 89800U (2014) https://doi.org/10.1117/12.2042744

KEYWORDS: Gyroscopes, Dispersion, Semiconductor lasers, Computer aided design, Sensors, Quantum wells, Waveguides, Refractive index, Numerical modeling, Laser systems engineering

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Proceedings Article | 14 March 2013 Paper

Slow/fast light due to induced dispersion in 1.55 um semiconductor lasers

Hemashilpa Kalagara, Peter Eliseev, Marek Osiński

Proceedings Volume 8619, 86190N (2013) https://doi.org/10.1117/12.2008622

KEYWORDS: Computer aided design, Dispersion, Semiconductor lasers, Slow light, Refractive index, Light wave propagation, Semiconductors, Numerical modeling, Quantum wells, Cladding

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Proceedings Article | 20 February 2013 Paper

Rate equation analysis of high-speed photon-lifetime-modulated strongly injection-locked semiconductor ring lasers

Hemashilpa Kalagara, Gennady Smolyakov, Marek Osiński

Proceedings Volume 8619, 861909 (2013) https://doi.org/10.1117/12.2008618

KEYWORDS: Modulation, Semiconductor lasers, Resonance enhancement, Vertical cavity surface emitting lasers, Semiconductors, Laser optics, Numerical modeling, Microrings, Continuous wave operation

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Proceedings Article | 3 March 2012 Paper

Bending losses and modal properties of serpentine and bent waveguides

Fei-Hung Chu, Laila Naznin, Hemashilpa Kalagara, Gennady Smolyakov, Marek Osinski

Proceedings Volume 8255, 825511 (2012) https://doi.org/10.1117/12.913582

KEYWORDS: Waveguides, Etching, Refractive index, Wave propagation, Beam propagation method, Cladding, Optical simulations, Quantum wells, Indium gallium arsenide, Signal attenuation

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Proceedings Article | 2 March 2012 Paper

Numerical simulation of nonlinear mode interactions in ridge-waveguide semiconductor lasers

Hemashilpa Kalagara, Petr Eliseev, Marek Osinski

Proceedings Volume 8255, 82550D (2012) https://doi.org/10.1117/12.914393

KEYWORDS: Computer aided design, Dispersion, Wave propagation, Cladding, Semiconductor lasers, Numerical simulations, Gallium arsenide, Quantum wells, Nonlinear optics, Terahertz radiation

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