A5067076151- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Laser Design and Applications
- Optical Coatings and Gratings
- Metamaterials and Metasurfaces Applications
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Semiconductor Quantum Structures and Devices
- Advanced Antenna and Metasurface Technologies
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Force Microscopy Techniques and Applications
- Slime Mold and Myxomycetes Research
- Photonic Crystal and Fiber Optics
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Spacecraft and Cryogenic Technologies
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Geophysics and Sensor Technology
- Advanced Fiber Optic Sensors
- Scientific Measurement and Uncertainty Evaluation
Jet Propulsion Laboratory
2015-2025
California Institute of Technology
2012-2020
Yale University
2010-2013
University of Southern California
2004-2011
Southern California University for Professional Studies
2008-2009
Flat optical devices thinner than a wavelength promise to replace conventional free-space components for wavefront and polarization control. Transmissive flat lenses are particularly interesting applications in imaging on-chip optoelectronic integration. Several designs based on plasmonic metasurfaces, high-contrast transmitarrays gratings have been recently implemented but not provided performance comparable curved lenses. Here we report polarization-insensitive, micron-thick, transmitarray...
Synchronization in oscillatory systems is a frequent natural phenomenon and becoming an important concept modern physics. Nanomechanical resonators are ideal for studying synchronization due to their controllable oscillation properties engineerable nonlinearities. Here we demonstrate of two nanomechanical oscillators via photonic resonator, enabling optomechanical between mechanically isolated resonators. Optical backaction gives rise both reactive dissipative coupling the mechanical...
Light emitted from single-mode semiconductor lasers generally has large divergence angles, and high numerical aperture lenses are required for beam collimation. Visible near infrared collimated using aspheric glass or plastic lenses, yet collimation of mid-infrared quantum cascade typically requires more costly made germanium, chalcogenide compounds, other infrared-transparent materials. Here we report dielectric metasurface flat that efficiently collimate the output lasers. The composed...
Since their inception, optical frequency combs have transformed a broad range of technical and scientific disciplines, spanning time keeping to navigation. Recently, dual comb spectroscopy has emerged as an attractive alternative traditional Fourier transform spectroscopy, since it offers higher measurement sensitivity in fraction the time. Midwave infrared (mid-IR) are especially promising effective means for probing strong fundamental absorption lines numerous chemical biological agents....
Two semiconductor optical frequency combs, consuming less than 1 W of electrical power, are used to demonstrate high-sensitivity mid-infrared dual-comb spectroscopy in the important 3–4 μm spectral region. The devices 4 mm long by wide, and each emits 8 mW average power. spectroscopic sensing performance is demonstrated measurements methane hydrogen chloride with multi-pass cell sensitivity enhancement. system provides a coverage 33 cm−1 (1 THz), 0.32 (9.7 GHz) sampling interval, peak...
Abstract Chip‐based optical frequency combs address the demand for compact, bright, coherent light sources of equidistant phase‐locked lines. Traditionally, Fourier Transform Spectroscopy (FTS) technique is considered a suboptimal choice resolving comb lines in chip‐based sensing applications due to requirement long delays, and spectral distortion from instrumental line shape. Here, sub‐nominal resolution FTS developed that extracts comb's offset any region directly measured interferogram...
The Palomar Radial Velocity Instrument (PARVI) is a J & H band, high resolution (R∼80,000) spectrograph on the Hale 5.08-m telescope at Observatory. PARVI stabilized, single-mode fiber-fed spectrometer designed to search for small rocky planets in habitable zones of late-type stars. one first radial velocity (RV) instruments employ fibers (SMF) instead more common multi-mode (MMF). SMFs provide number advantages over MMFs. In particular, they only allow spatial mode light propagate,...
We present direct frequency comb cavity ring-down spectroscopy with Vernier filtering as a straightforward approach to sensitive and multiplexed trace gas detection. The high finesse acts both extend the interaction length sample spectral filter, alleviating need for dispersive elements or an interferometer. In this demonstration, free running interband cascade laser was used generate centered at 3.3 μm covering ∼10 cm–1 (300 GHz), which coupled into high-finesse cavity, providing 0.9 km of...
Interband cascade (IC) laser structures offer attractive potential for operation at room temperature as both broadband coherent sources of mid-infrared light and fast photodetectors. This makes the realization extremely compact spectrometers on a monolithic platform possible, even dual-comb spectroscopy (DCS) configurations. IC comb devices are perfect candidates this configuration, since they develop near-THz-wide optical frequency spectra from millimeter-sized cavity, using multi-stage...
Chip-scale electrically pumped optical frequency combs (OFCs) are expected to play a fundamental role in applications ranging from telecommunications sensing. To date, however, the availability of such sources around 2 μm has been scarce. Here, we present frequency-modulated OFC operating 2060 nm wavelength exploiting inherent gain nonlinearity single-section GaSb-based quantum well diode lasers. A mm long device as self-starting comb outputs 50 mW power over more than 10 bandwidth while...
The maximum amplitude of mechanical oscillators coupled to optical cavities is studied both analytically and numerically. backaction on the resonator enables self-sustained oscillations whose limit cycle set by dynamic range cavity. attainable phonon generation quantum efficiency process are for unresolved resolved cavities. Quantum efficiencies far exceeding one found in sideband regime where low. On other hand, system. Finally, role nonlinearities addressed.
We report on the performance and reliability of laterally-coupled distributed-feedback (DFB) interband cascade lasers designed to operate at 3.6 μm wavelength. A two-step ridge etch process ensures single-transverse-mode operation with minimal lateral current spreading, a second-order Bragg grating etched alongside waveguide imposes single-mode DFB operation. Life tests performed four randomly selected lasers, continuously operating 40 °C output power >10 mW, showed no measurable...
Interband cascade lasers (ICLs) have emerged as efficient, room-temperature semiconductor light sources with relatively high wallplug efficiency and low power consumption in the 3–6 µm wavelength region. The recent discovery that ICLs can generate self-starting optical frequency combs has triggered a new avenue of research ultimately promises to provide broadband, gap-free chemical sensing for simultaneous detection multiple species or rapid scanning broad absorption features. Here we review...
We demonstrate index-coupled distributed-feedback diode lasers at 2.65 µm that are capable of tuning across strong absorption lines HDO and other isotopologues H 2 O.The employ InGaAsSb/AlInGaAsSb multi-quantum-well structures grown by molecular beam epitaxy on GaSb, single-mode emission is generated using laterally coupled second-order Bragg gratings etched alongside narrow ridge waveguides.We verify nearcritical coupling the analyzing modal characteristics different length.With an facet...
A high-quality-factor (Q) photonic crystal heterostructure laser was designed and characterized. Good agreement obtained between the experimental lasing data three-dimensional finite-difference time-domain numerical predictions.
The first unambiguous linewidth measurements are reported for fiber-pigtailed high-power distributed feedback (DFB) semiconductor lasers operating near 2.05 μm wavelength range. DFB packaged inside standard 14-pin butterfly package with polarization- maintaining output fiber and an integrated optical isolator. Schawlow-Townes was measured using the coherent frequency-discriminator technique a Mach-Zehnder interferometer total characterized heterodyne setup. Our indicate less than 100 KHz of...
We report on the stabilization of a high-power distributed feedback (DFB) semiconductor laser operating at 2.05 μm wavelength, using crystalline whispering gallery mode microresonator. The laser's frequency noise is measured to be below 100 Hz/Hz1/2 Fourier frequencies ranging from 10 Hz 1 MHz. instantaneous linewidth improved by four orders magnitude compared with free-running DFB laser, and 15 0.1 ms measurement time. integral approaches Hz. stabilized integrated polarization maintaining...
Room-temperature continuous-wave lasing was demonstrated in photonic crystal microcavities with diameters of approximately 3.2 μm. Far-field radiation patterns these lasers were experimentally measured and compared numerical simulation predictions.
Analysis of feedforward linewidth reduction scheme for semiconductor lasers followed by measurements are presented in this paper. The design challenges such a system, improvements to the original explained and demonstrated using top-bench electrooptical setups. experiments carried out on commercially available 1.55- m distributed feedback (DFB) laser. measurement results show more than 40 times frequency noise power spectrum. Also laser full-width at half-maximum (FWHM) 2.6 MHz is reduced...
Mid-wave infrared (MIR, 3--5 $\mu$m) optical frequency combs (OFC) are of critical importance for spectroscopy fundamental molecular absorption features in space and terrestrial applications. Although this band OFCs can be obtained via supercontinuum or difference generation using pumping schemes, unprecedented source miniaturization monolithic design unique to electrically-pumped semiconductor laser structures. To date, high-brightness OFC region has been demonstrated quantum- interband...
Sapphire-bonded photonic crystal laser cavities with varying number of periods were studied in order to determine the optical loss these cavities. The lasing threshold increases as lattice decreases, and quality factors calculated from data. Continuous-wave operation was achieved for eight or more cladding
As an attempt to collect more in-plane emission power out of wavelength size two-dimensional photonic crystal defect lasers, edge-emitting double-heterostructure quantum well membrane lasers were fabricated by shortening the number cladding periods on one side. 120μW peak output was collected from facet single mode laser at room temperature. Laser efficiencies analyzed and agree very with three-dimensional finite-difference time-domain modeling.