P.J.S. Heim

Thorlabs (United States)

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Co-Authors

M. Dagenais

University of Maryland, College Park

F.G. Johnson

Infinera (United States)

Scott A. Merritt

Goddard Space Flight Center

James G. Fujimoto

Massachusetts Institute of Technology

Vijaysekhar Jayaraman

Praevium Research (United States)

Benjamin Potsaid

Massachusetts Institute of Technology

Richard P. Leavitt

Physical Sciences (United States)

Alex Cable

Thorlabs (Germany)

D.R. Stone

University of Maryland, College Park

James Jiang

Royal North Shore Hospital

Cooperative Institutions

University of Maryland, College Park

Massachusetts Institute of Technology

Physical Sciences (United States)

Praevium Research (United States)

DEVCOM Army Research Laboratory

Korea University

Korea Institute of Science and Technology

Thorlabs (United States)

Dartmouth College

University of California, Santa Barbara

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The quest for clarity on data protection and security

Network Security (2014)

P.J.S. Heim

CLARITY

10.1016/s1353-4858(14)70020-0

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Citations (0)

Single-longitudinal-mode, nonantireflection-coated, fiber grating laser with a 50-dB side-mode suppression ratio

Z.F. Fan J.H. Song P.J.S. Heim S.H. Cho M. Dagenais

Summary form only given. The center wavelength of the fibre grating laser (FGL) was determined by the fiber grating Bragg wavelength. We are currently exploring packaging methods to enable strain tuning of the output wavelength. We are also working on optimizing the device and cavity design to reduce chirp and increase modulation bandwidth.

Fiber Bragg Grating

Chirp

PHOSFOS

Long-period fiber grating

Longitudinal mode

10.1109/cleo.1998.675963

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Citations (1)

Ultrahigh speed endoscopic optical coherence tomography using micro-motor imaging catheter and VCSEL technology

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2013)

Tsung-Han Tsai Yuankai K. Tao Benjamin Potsaid Vijaysekhar Jayaraman Martin F. Kraus

We developed a micro-motor based miniature catheter with an outer diameter of 3mm for ultrahigh speed endoscopic optical coherence tomography (OCT) using vertical cavity surface-emitting laser (VCSEL) at a 1MHz axial scan rate. The micro-motor can rotate a micro-prism at 1,200-72,000rpm (corresponding to 20- 1,200fps) with less than 5V driving voltage to provide fast and stable scanning, which is not sensitive to the bending of the catheter. The side-viewing probe can be pulled back for a long distance to acquire three-dimensional (3D) dataset covering a large area on the specimen. VCSEL provides high a-line rate to support dense sampling under high frame rate operation. With the use of a C++ based high speed data acquisition (DAQ) system, in vivo three-dimensional OCT imaging in rabbit GI tract with 1.6mm depth range, 11μm axial resolution, 8μm lateral resolution, and frame rate of 400fps is demonstrated.

Frame rate

Vertical-cavity surface-emitting laser

Horizontal scan rate

Prism

10.1117/12.2006952

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Citations (5)

Near-field scanning optical microscopy analysis of the near and far-field intensity distribution of semiconductor laser diodes

Quantum Electronics and Laser Science Conference (1996)

Walid Atia Saeed Pilevar B. Gopalan P.J.S. Heim M. Dagenais

Summary form only given. Preliminary measurements of the near field in the transverse dimension of a semiconductor laser reveal subwavelength features not measurable in the far field. We thus show that the direct measurement of the near field via near field scanning optical microscopy (NSOM) permits a careful analysis of the indirect theoretical near-field calculation based on far-field extrapolation techniques. Modifications to the far-field theory can then be made to obtain a more accurate representation of the true near-field distribution.

Near-field optics

Source

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Citations (1)

Packaging of a monolithic microwave/optical receiver chip with an optical fiber

Conference on Lasers and Electro-Optics (1996)

V. Vusirikala P.J.S. Heim M. Dagenais C.P. McClay

Summary form only given. Here we report on the design and operation of a high-speed monolithically integrated GaAs receiver with MSM photodetector. We also report on a packaging approach to reliably couple light from an optical fiber on to the planar detector. This approach utilizes Si V-groove technology and flip-chip bonding to achieve the required alignment tolerances.

Groove (engineering)

Source

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1065nm and 1310nm MEMS tunable VCSEL light source technology for OCT imaging

SPIE Newsroom (2012)

Benjamin Potsaid Vijaysekhar Jayaraman James Jiang Alex Cable P.J.S. Heim

Vertical-cavity surface-emitting laser

10.1117/2.1201207.004347

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Citations (2)

Ueber die Einwirkung von Alkali auf Pektinstoffe

P.J.S. Heim

10.3929/ethz-a-000090076

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Citations (0)

980-nm semiconductor optical preamplifier direct-detection receiver

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1996)

P.J.S. Heim M. Dagenais Michael A. Krainak Richard P. Leavitt

We report on the operation of a direct-detection 980 nm receiver based upon a semiconductor traveling wave optical preamplifier. An InGaAs/GaAs/AlGaAs single-quantum-well ridge- waveguide angled-facet optical amplifier was fabricated with an internal gain of over 30 dB and a noise figure of 3.8 dB. When used as an optical preamplifier, an improvement of 13 dB in receiver signal-to-noise sensitivity was measured relative to the PIN receiver without optical preamplifier. The signal-to-noise performance of a 250 MHz APD receiver was also measured and was observed to be 8 dB more sensitive than the optically preamplified receiver. Calculations based on these results indicate that with a narrower optical filter bandwidth (0.1 nm) and improved amplifier input coupling efficiency (50%), the optically preamplified receiver can simultaneously achieve high-sensitivity (5 dB better than 250 MHz bandwidth APD) and high-bandwidth (30 GHz).

Preamplifier

10.1117/12.238417

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Citations (2)

Reliable widely tunable electrically pumped 1050nm MEMS-VCSELs with amplifier in single butterfly co-package

Chris Burgner John Carter Alan Donaldson Nate Bramham Benjamin Potsaid

We demonstrate the first 1050nm MEMS-eVCSEL co-packaged with a wideband amplifier to achieve over 70nm wavelength tuning at over 30mW of output power and SMSR greater than 40dB. Ophthalmic Optical Coherence Tomography Angiography (OCTA) images acquired at 800kHz A-scan rates showcase the telecom grade 14pin butterfly co-package as a path to low cost swept source OCT engines. Device design employs a strain-compensated InGaAs/GaAsP gain region disposed on a wideband fully oxidized GaAs/AlxOy back mirror capable of tuning ranges beyond 100nm. It has been suggested the wideband fully oxidized GaAs/AlxOy back mirror may pose risk to device lifetime reliability. However, over 9000hrs of lifetime testing validates reliability and projects device lifetimes exceed 20,000hrs under continuous use.

Wideband

10.1117/12.2549050

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Citations (4)

Single-angled-facet laser diode for widely tunable external cavity semiconductor lasers with high spectral purity

Electronics Letters (1997)

P.J.S. Heim Z.F. Fan S.-H. Cho Ki Hyun Nam M. Dagenais

External cavity semiconductor lasers are demonstrated using a single-angled-facet semiconductor laser diode that does not require anti-reflection coating. A wide tuning bandwidth (7%, λ = 980 nm), large side-mode suppression ratio (50 dB, λ = 1590 nm), narrow linewidth (50 kHz), and high output power (13.5 mW) are achieved with conventional external cavity configurations.

Laser linewidth

Facet (psychology)

10.1049/el:19970911

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Citations (19)