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We demonstrate uncooled 2.5 Gb/s operation up to 110degC of 1.3 mum GaInNAs double quantum well lasers with low threshold current and excellent temperature stability.
A channel waveguide exhibiting internal gain under pumping is fabricated inside erbium doped oxyfluoride-silicate glass using a femtosecond laser. The waveguide cross section and refractive index contrast is controlled using a multi-scan technique.
Using reverse biased p-i-n diode structure, we efficiently reduced nonlinear absorption and achieved continuous-wave lasing in silicon waveguide cavities based on stimulated Raman scattering. We report here the lasing characteristics for different laser cavity configurations.
A fully integrated self-referenced Er-fiber frequency-comb system without the use of highly nonlinear or microstructured fiber is demonstrated. We use a single PPLN-waveguide for both spectral broadening and 2f-to-3f CEO-phase detection.
Room temperature, continuous-wave operation of lambda~8.2 mum quantum cascade lasers grown by MOCVD is reported. The lasers have been processed as double-channel ridge waveguides without the need for buried heterostructures.
We demonstrate tunable semiconductor lasers based on three coupled photonic crystal sections, that allows up to 18 nm tuning range with a side-mode suppression ratio greater than 35 dB.
Imaging Bloch oscillations in curved waveguide arrays, fabricated by femtosecond laser writing in an erbium-doped glass substrate, is reported. The green fluorescence of erbium ions traces the flow of pump light along the array.
A planar-waveguide quasi-phase matched second-harmonic generation device, which consists of a Y-cut periodically poled MgO-doped LiNbO3 core and SiO2 claddings, provides 1-W green light with 30-% conversion efficiency at room temperature.
We report progress with diode-pumping of garnet crystal waveguide structures fabricated by PLD. Lasing has been achieved in a single-layer Nd:GGG film, and a four-layer structure with a Nd:GSGG core is currently undergoing laser trials.
Hollow photonic-crystal fibers can transmit and spectrally transform high-intensity laser fields in the regime of isolated guided modes. Such modes are used for coherent excitation and probing of molecular Raman-active modes in the gas phase.
We demonstrated an optofluidic distributed feedback (DFB) dye laser on a poly(dimethylsiloxane) (PDMS) chip. Single-mode operation was obtained with 0.21 nm linewidth. We achieved nearly 60 nm continuously tunable output by mechanically varying the grating period.
We have obtained 90 W CW with a 1-cm-wide single-mode 970-nm array, and have wavelength beam combined 50 W quasi-CW and 29 W CW in nearly-diffraction-limited beams, the highest brightness all-diode lasers reported.
A tunable photonic crystal laser based on two coupled cavities was integrated with a wavelength monitor. The monitor is based on a compact, multimode photonic crystal waveguide together with a photodiode.
A two-color Fabry-Perot laser is designed with a distribution of slots in the ridge waveguide, fabricated and characterised. The two-color lasing produces a strong four wave mixing signal, and is promising for direct THz emission.
Light output from photonic crystal microlaser was remarkably enhanced to 214 times higher by optimizing the laser-waveguide coupled structure. A practical high efficiency was obtained in this type of microlaser, for the first time.
Novel quasi-guided optical waveguide (QGOW) VCSELs is presented and analyzed for lateral mode control in large-aperture single-mode high-power VCSELs, with large modal discrimination in excess of 20 cm-1 and low fundamental mode loss.
A new domain of rapid waveguide writing using 50 to 1500 fs laser pulses is presented for fused silica. Type II photosensitivity mechanisms are inferred for the low-loss waveguides, imprinted with coarsely overlapping pulses.
We demonstrate slow-down of a modulated light signal in a semiconductor waveguide. Concatenated amplifying and absorbing sections simultaneously achieve both amplification and a controllable time delay at 15 GHz.
We investigate the dynamics of quantum cascade lasers and find that spatial hole burning and the Risken-Nummedal-Graham-Haken (RNGH) instability are the main causes for multimode operation in these semiconductor lasers.
A double-heterostructure photonic crystal laser cavity was designed and characterized in a lattice-shifted photonic crystal membrane. A high side-mode-suppression-ratio (20 dB) mode was obtained from this cavity. Good agreement was obtained between the numerical predictions and the experimental lasing data.
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