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We report photonic crystal membrane nanolasers which employ a decimated photonic crystal cavity. Optically pumped lasing is achieved in decimated linear and star cavities showing that nonperiodic yet symmetric lattice structures provide sufficient optical confinement.
Developments in tunable external-cavity quantum cascade lasers will be presented, along with results on broadly tunable lasers for spectroscopic applications.
We will discuss extraordinary properties of a single-layer one-dimensional high contrast grating (HCG). Tunable HCG-VCSELs are fabricated with 8000 times size reduction in the tunable mirror size and 160 times improved tuning speed of 63 ns.
Cavity dumping of a fiber laser is demonstrated. A microstructured fiber with an electrically driven internal electrode is used for intracavity polarization rotation with nanosecond risetime. The optical flux can be dumped within one roundtrip.
Using intracavity active phase modulation, we have verified the theory of Haus and Rana and realized timing jitter reduction from 304 fs to 150 fs integrated to Nyquist frequency on a 10.24 GHz actively mode-locked pulse train.
We present a monolithically integrated, InP-based 2D long-wavelength VCSEL array with coupling near fields. These lasers, utilizing a buried tunnel junction for current confinement, show partly coherent emission at 1.55 mum wavelength.
A 301 MHz fundamentally mode-locked erbium fiber ring laser generating 108 fs pulses is demonstrated. Novel combination of gain fiber with anomalous group-velocity dispersion and intra-cavity silicon with normal group-velocity dispersion yields a stretched-pulse operation.
The optimization of phase distortion spectral power density is proposed as an alternative to GDD minimization of ultrafast cavity mirrors. This criterion is shown to minimize the detuning of cavity resonances from a uniform comb.
We report on the intracavity frequency-doubling of a GaInNAs/GaAs disk laser. The laser operated at 1220 nm and delivered 4.6 W of power at ~610 nm. The red emission was further frequency-doubled to 305 nm.
We demonstrate simultaneous detection of multiple airborne chemicals at low-ppb concentrations using a sensor based on a rapid tuning of an external cavity quantum cascade laser from 7.87-8.70 mum.
A long ring-cavity, low repetition rate Yb-doped fiber laser was demonstrated. Pulses with repetition rate of about 381.3 kHz and single pulse energy above 300 nJ were obtained.
A 3-mm-long, 150-mum-wide broad-area quantum cascade laser (lambda = 4.65 mum) with sidewall corrugations produced a maximum-current-limited pulsed output power of 53 W and wall-plug efficiency of 29.4% from two facets at 80 K. The processing was applied to a structure which employed a Ga0.33In0.67As/Al0.64In0.36As strain-compensated double-phonon design with the injection barrier thinned in order...
We propose a highly-sensitive fiber optic sensor based on polarization mode beating techniques for measuring nanometric changes in optical pathlength. The high sensitivity and narrow laser linewidth show a potential application for ultra-sensitive biological measurements.
We present a fast wavelength tuning of a Littrow-type EC-QCL. This configuration allows for coarse broadband and high resolution mode-hop-free wavelength scanning at >1 kHz rates. Example EC-QCL measurements of mid-infrared ammonia spectra are demonstrated.
We describe a continuous-wave optical parametric oscillator operated within a semiconductor disk laser, free of relaxation oscillations associated with neodymium-based systems. Parametric threshold occurred at 1.4 W primary (diode) pump power and 8.5 W yielded 205 mW idler.
We demonstrate a fiber laser source with shot noise limited performance above 1.5 MHz, by passive filtering with cascaded fiber ring cavities. The laser is kept resonant with the cavities via Pound-Drever-Hall frequency feedback control.
We demonstrate compact integration of 780 and 850-nm vertical-cavity surface-emitting lasers into a micro-fluidic microsystem. Absorption at 850 nm and fluorescence pumping at 780 nm of near-infrared fluorescent molecules are presented.
A high bandwidth, high power, 980 nm vertical-cavity surface-emitting laser (VCSEL) array with 3 dB frequency response over 7.5 GHz and continuous wave (CW) power of greater than 120 mW at room temperature is reported.
We report a direct method to observe higher-order whispering gallery modes in vertical cavity surface emitting lasers (VCSELs) at room temperature. Instead of introducing any defect mode, we show that suppression of lower-order cavity modes can be achieved by destroying vertical reflectors with a surface micro-structure. Perfect whispering gallery modes with an azimuthal number as large as 41 are...
We study the coupling between a fiber-taper and two whispering-gallery modes simultaneously excited in a single PDMS-coated silica microtoroid theoretically and experimentally. The transmission spectrum of the fiber coupled two-mode resonator shows a sharp electromagnetically-induced-transparency-like window.
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