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Your search keyword '"Grant, Hannah"' showing total 31 results
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31 results on '"Grant, Hannah"'

1. Photonic Integration Advancements in Miniaturizing High Reliability LIDAR System Components

Author

Sherman, Jes, Estrella, Steven, Rosborough, Victoria, Campbell, Jenna, Labrecque, Michelle, Isaac, Brandon, Seifter, Jason, Grant, Hannah, Musolf, Juergen, Kebort, Don, Gans, Ruby, Wagner, Sabrina, Nehrir, Amin, Morrison, Gordon, Johansson, Leif, Mashanovich, Milan, De Rosa, Sergio, Series Editor, Zheng, Yao, Series Editor, Popova, Elena, Series Editor, Singh, Upendra N., editor, Tzeremes, Georgios, editor, Refaat, Tamer F., editor, and Ribes Pleguezuelo, Pol, editor

Published
2024
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2. Integrated Electro-Optic Isolator on Thin Film Lithium Niobate

Author

Yu, Mengjie, Cheng, Rebecca, Reimer, Christian, He, Lingyan, Luke, Kevin, Puma, Eric, Shao, Linbo, Shams-Ansari, Amirhassan, Grant, Hannah R., Johansson, Leif, Zhang, Mian, and Lončar, Marko

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Optical isolator is an indispensable component of almost any optical system and is used to protect a laser from unwanted reflections for phase-stable coherent operation. The development of chip-scale optical systems, powered by semiconductor lasers integrated on the same chip, has resulted in a need for a fully integrated optical isolator. However, conventional approaches based on application of magneto-optic materials to break the reciprocity and provide required isolation have significant challenges in terms of material processing and insertion loss. As a result, many magnetic-free approaches have been explored, including acousto-optics, optical nonlinearity, and electro-optics. However, to date, the realization of an integrated isolator with low insertion loss, high isolation ratio, broad bandwidth, and low power consumption on a monolithic material platform is still absent. Here we realize non-reciprocal traveling-wave EO-based isolator on thin-film LN, enabling maximum optical isolation of 48 dB and an on-chip insertion loss of 0.5 dB using a single-frequency microwave drive at 21-dBm RF power. The isolation ratio is verified to be larger than 37 dB across a tunable optical wavelength range from 1510 to 1630 nm. We verify that our hybrid DFB laser - LN isolator module successfully protects the single-mode operation and the linewidth of the DFB laser from reflection. Our result is a significant step towards a practical high-performance optical isolator on chip.

Published
2022
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3. Feasibility and acceptability of home-based neonatal hyperbilirubinemia screening by community health workers using transcutaneous bilimeters in Bangladesh

Author

Rahman, Mahbubur, Jahan, Farjana, Billah, Sk Masum, Yeasmin, Farzana, Rahman, Musarrat Jabeen, Jahir, Tania, Parvez, Sarker Masud, Das, Jyoti Bhushan, Amin, Ruhul, Hossain, Khobair, Grant, Hannah, Hasan, Rezaul, Darmstadt, Gary L., Hoque, Md. Mahbubul, Shahidullah, Mohammod, Islam, Muhammad Shariful, Ashrafee, Sabina, and Foote, Eric M.

Published
2023
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4. Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens

Author

Yu, Mengjie, Reimer, Christian, Barton, David, Kharel, Prashanta, Cheng, Rebecca, He, Lingyan, Shao, Linbo, Zhu, Di, Hu, Yaowen, Grant, Hannah R., Johansson, Leif, Okawachi, Yoshitomo, Gaeta, Alexander L., Zhang, Mian, and Lončar, Marko

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Integrated femtosecond pulse and frequency comb sources are critical components for a wide range of applications. The leading approaches for on-chip pulse generation rely on mode locking inside microresonator with either third-order nonlinearity or with semiconductor gain. These approaches, however, are limited in noise performance, wavelength tunability and repetition rates. Alternatively, sub-picosecond pulses can be synthesized without mode-locking, by modulating a continuous-wave (CW) single-frequency laser using a cascade of electro-optic (EO) modulators. This method is particularly attractive due to its simplicity, robustness, and frequency-agility but has been realized only on a tabletop using multiple discrete EO modulators and requiring optical amplifiers (to overcome large insertion losses), microwave amplifiers, and phase shifters. Here we demonstrate a chip-scale femtosecond pulse source implemented on an integrated lithium niobate (LN) photonic platform18, using cascaded low-loss electro-optic amplitude and phase modulators and chirped Bragg grating, forming a time-lens system. The device is driven by a CW distributed feedback (DFB) chip laser and controlled by a single CW microwave source without the need for any stabilization or locking. We measure femtosecond pulse trains (520 fs duration) with a 30-GHz repetition rate, flat-top optical spectra with a 10-dB optical bandwidth of 12.6 nm, individual comb-line powers above 0.1 milliwatt, and pulse energies of 0.54 picojoule. Our results represent a tunable, robust and low-cost integrated pulsed light source with CW-to-pulse conversion efficiencies an order of magnitude higher than achieved with previous integrated sources. Our pulse generator can find applications from ultrafast optical measurement to networks of distributed quantum computers.

Published
2021

6. Electrically-pumped high-power laser transmitter integrated on thin-film lithium niobate

Author

Shams-Ansari, Amirhassan, Renaud, Dylan, Cheng, Rebecca, Shao, Linbo, He, Lingyan, Zhu, Di, Yu, Mengjie, Grant, Hannah R., Johansson, Leif, Zhang, Mian, and Loncar, Marko

Subjects
Physics - Applied Physics, Physics - Optics
Abstract

Integrated thin-film lithium niobate (TFLN) photonics has emerged as a promising platform for realization of high-performance chip-scale optical systems. Of particular importance are TFLN electro-optic modulators featuring high-linearity, low driving voltage and lowpropagation loss. However, fully integrated system requires integration of high power, low noise, and narrow linewidth lasers on TFLN chip. Here we achieve this goal, and demonstrate integrated high-power lasers on TFLN platform with up to 60 mW of optical power in the waveguides. We use this platform to realize a highpower transmitter consisting an electrically-pumped laser integrated with a 50 GHz modulator.

Published
2021
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8. High-pulse energy 1550 nm seed laser technology for time-of-flight LiDAR systems

Author

Grant, Hannah R., primary, Sincore, Alex, additional, Trucks, Andrew, additional, Abdulfattah, Ali, additional, Wagner, Sabrina, additional, Zhu, Cheng, additional, Drummer, Tony, additional, Shah, Lawrence, additional, Hicks, Richmond, additional, Still, Rob, additional, Faue, Jon, additional, Bangera, Depeesh, additional, LaChapelle, Joseph, additional, Eichenholz, Jason, additional, Mashanovitch, Milan, additional, Leisher, Paul O., additional, and Estrella, Steven B., additional

Published
2024
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9. Demonstration of high-power 1.55 um DFB technology suitable for consumer automotive lidar

Author

Grant, Hannah R., primary, Wagner, Sabrina, additional, Kliman, Peter, additional, Sincore, Alex, additional, Trucks, Andrew, additional, Abdulfattah, Ali, additional, Morrison, Gordon, additional, Zhu, Cheng, additional, Shah, Lawrence, additional, Hicks, Richmond, additional, LaChapelle, Joseph, additional, Eichenholz, Jason, additional, Mashanovitch, Milan, additional, and Leisher, Paul O., additional

Published
2024
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10. An efficient and compact nanosecond pulsed Er-Yb doped fiber laser with broad operation temperature range

Author

Zhu, Cheng, primary, Shah, Lawrence, additional, Sincore, Alex, additional, Satter, Lamees, additional, Grant, Hannah, additional, Zucker, Erik P., additional, Boelen, Sander, additional, Grant, Alexander, additional, Torres, Maria, additional, Trucks, Andrew, additional, Consiglio, Ron, additional, Drummer, Tony, additional, Soto, Elias, additional, Bush, Zachary, additional, Hicks, Richmond, additional, Mielke, Stephen L., additional, Yusim, Alexander, additional, Harmon, Derek, additional, Ebert, Chris, additional, Leisher, Paul, additional, LaChapelle, Joseph, additional, and Eichenholz, Jason, additional

Published
2024
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11. Advancements in high brightness tapered diode laser amplifiers

Author

Campbell, Jenna, primary, Labrecque, Michelle, additional, McClune, Kevin, additional, Kudryashov, Igor, additional, Ebert, Chris, additional, Boelen, Sander, additional, Burke, Elliot, additional, Liu, Thomas, additional, Garrett, Henry, additional, Larkins, Matthew, additional, Kinney, Sarah, additional, Chu, Allen, additional, Grant, Hannah, additional, Morrison, Gordon, additional, Johansson, Leif, additional, Mashanovitch, Milan, additional, and Leisher, Paul, additional

Published
2024
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15. Toward future generation digital avionics fiber optic communication

Author

Bassinan, Obidon, primary, Ahadian, Joe, additional, Beranek, Mark, additional, Campillo, Anthony, additional, Estrella, Steven B., additional, Grant, Hannah R., additional, Kebort, Don, additional, Kuznia, Charlie, additional, Mashanovitch, Milan, additional, Skendzic, Sandra, additional, Tatum, Jim, additional, and Woodson, Madison, additional

Published
2023
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16. Implementing a group‐based multi‐component early child development intervention through the government health system in rural Bangladesh: A feasibility study.

Author

Rahman, Mahbubur, Jahir, Tania, Akter, Fahmida, Yeasmin, Farzana, Pitchik, Helen O., Hasan, Rezaul, Das, Jyoti Bhushan, Grant, Hannah X., Hossain, Khobair, Sultana, Jesmin, Huda, Tarique Md. Nurul, Shoab, AKM, Khan, Rizwana, Tofail, Fahmida, Luby, Stephen P., Fernald, Lia C. H., Rashid, Jahangir, Ashrafee, Sabina, Leontsini, Elli, and Winch, Peter J.

Published
2023
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17. Integrated femtosecond pulse generator on thin-film lithium niobate

Author

Yu, Mengjie, primary, Barton III, David, additional, Cheng, Rebecca, additional, Reimer, Christian, additional, Kharel, Prashanta, additional, He, Lingyan, additional, Shao, Linbo, additional, Zhu, Di, additional, Hu, Yaowen, additional, Grant, Hannah R., additional, Johansson, Leif, additional, Okawachi, Yoshitomo, additional, Gaeta, Alexander L., additional, Zhang, Mian, additional, and Lončar, Marko, additional

Published
2022
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22. Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens

Author

Lončar, Marko, primary, Yu, Mengjie, additional, Reimer, Christian, additional, Barton, David, additional, Kharel, Prashanta, additional, Cheng, Rebecca, additional, He, Lingyan, additional, Shao, Linbo, additional, Zhu, Di, additional, Hu, Yaowen, additional, Grant, Hannah, additional, Johansson, Leif, additional, Okawachi, Yoshitomo, additional, Gaeta, Alexander, additional, and Zhang, Mian, additional

Published
2022
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24. Electro-Optic-Modulator-Based Integrated Optical Isolator

Author

Yu, Mengjie, primary, Cheng, Rebecca, additional, Reimer, Christian, additional, He, Lingyan, additional, Luke, Kevin, additional, Puma, Eric, additional, Shao, Linbo, additional, Shams-Ansari, Amirhassan, additional, Grant, Hannah R., additional, Johansson, Leif, additional, Zhang, Mian, additional, and Lončar, Marko, additional

Published
2022
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28. Advancements in high-brightness tapered diode laser amplifiers

Author

Zediker, Mark S., Zucker, Erik P., Campbell, Jenna, Campbell, Jenna, Labrecque, Michelle, McClune, Kevin, Kudryashov, Igor, Ebert, Chris, Boelen, Sander, Burke, Elliot, Liu, Thomas, Garrett, Henry, Larkins, Matthew, Kinney, Sarah, Chu, Allen, Grant, Hannah, Morrison, Gordon, Johansson, Leif, Mashanovitch, Milan, and Leisher, Paul

Published
2024
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31. Nursing Considerations for Post-traumatic Amnesia After a Traumatic Brain Injury

Author

Grant, Hannah

Subjects
traumatic brain injury, post-traumatic amnesia, memory, posttraumatic confusion state, orientation, agitation, Bioethics and Medical Ethics, Critical Care, Critical Care Nursing, Medical Anatomy, Medical Neurobiology, Neurology, Neurosciences
Abstract

A period known as post-traumatic amnesia (PTA) often follows a traumatic brain injury (TBI). PTA is characterized by anterograde and retrograde amnesia, confusion, disorientation, and agitation. The duration and severity of PTA is a key indicator of the long-term prognosis after a TBI, so proper assessment and nursing care of a PTA patient is crucial. TBIs range from mild to severe, but primarily affect the fronto-temporal lobes. In PTA, both neural lesions and white matter damage within the parahippocampal region can cause PTA. A nurse must perform a thorough assessment of a TBI patient, but, since PTA is a key indicator of a TBI, a nurse must be familiar with the PTA assessment scales, particularly when comparing the Westmead Post-Traumatic Amnesia Scale (WPTAS) and the Galveston Orientation and Amnesia Test (GOAT). Finally, multi-disciplinary care of a TBI patient within PTA patient must include evidence-based pharmacological and nonpharmacological treatments, nursing considerations, nutritional considerations, physical and occupational therapy, and psychosocial implications.

Published
2022

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