The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A hybrid silicon laser with an on-chip optical phased array for 1D beam steering across a 12° field of view is demonstrated. The device achieved 7 dB background suppression and 1.8° × 0.6° beam width.
The laser light reflection intensity on human skin varies depending the ethnicity of each person, in this paper we present an analysis of reflection intensity and how affects the measurement of some optoelectronic devices.
This paper will discuss and demonstrate the advantages of laser beam combining using single mode integrated optics based on TriPleX™ waveguide technology. Color combining through integrated optics yields compact, robust an low cost devices.
We demonstrate a monolithic 10nm tunable integrated laser on a QW structure. Wavelength switching is achieved by steering an optical gain media laterally over two adjacent quantum well regions selectively intermixed to varying extents.
A technique for full spatio-temporal characterization of impulse responses of optical systems with an almost one-wave-cycle temporal resolution was developed. It was employed to characterize ultrashort Airy-Bessel light bullets generated by a circular diffraction grating.
Modeling results for lateral-longitudinal mode discrimination in longitudinally inhomogeneous finite-length waveguides of ridge lasers are presented, obtained by numerical solutions of the wave equation and calculations of the mode thresholds, predicting high-brightness single-mode output of wide stripes.
Adiabatically flared slab-coupled optical waveguide lasers (SCOWLs) at 1.06 µm wavelength have been studied, achieving a large fundamental mode and a 32% increase in COD power. Capabilities and limitations of the taper mechanism are discussed.
Femtosecond mid-IR pulses were coupled into a quantum cascade laser. The spectral broadening and far-field profile of the transmitted pulses showed an intensity dependence. n2 was experimentally estimated to be on the order of ∼10−9cm2/W.
Using a 3.9µm driving laser focused into a high-pressure gas-filled waveguide, we generate bright, phase matched, fully spatially coherent high harmonic beams in the keV region for the first time.
We built a compact, common path, laser epi-illumination diffraction phase microscope (epi-DPM) for defect detection on a patterned semiconductor wafer. The wafer's underlying structure and buried defects with ∼ 100 nm size were measured.
Peak Power above 1 PW was obtained from a femtosecond Ti:sapphire laser facility based on DCPA technique. With optical parametric amplification clean the seeding pulse, we measured contrast ratio up to 1010 in picosecond range.
The SG-II upgrade laser facility includes a Petawatt beamline for fundamental physics and advanced applications, which requires large pulse compression gratings. Since it is exhausted to fabricate large size diffraction grating which can meet the stringent requirements of the PW beamline, an elliptical beam is employed firstly for maximum energy while using pulse compression gratings with a size of...
We have demonstrated a novel optical-parametric chirped-pulse amplification scheme with diverged pump beam for ultraboradband phase-matching. Over 400nm ultrabroadband amplified pulses was successfully obtained at 1000 nm center wavelength with a gain of 1.2×105.
The recent technical progress on the femtosecond petawatt Ti:sapphire laser are presented, which include the peak power (1.26PW) and temporal contrast (∼1011) enhancement. Further, the significant applications achieved from the petawatt laser facility are summarized.
We report on the fabrication of photopolymerizable polymer nanocomposites dispersed with semiconductor CdSe quantum dots as high as 0.91 vol.% (3.6 wt.%) and on their nonlinear optical responses measured by degenerate multi-wave mixing with a 532-nm picosecond laser. We show that multi-order self-diffracted beams are induced in a uniformly cured composite film, indicating that the composite film possesses...
We review the technique of spectral beam combining and discuss detailed limitations in the laser systems used for combination of multiple cw and pulsed fiber amplifiers to kW average power and mJ's of pulse energy.
We present active phase-locking of fiber amplifiers using Walsh coded modulations. Numerical simulations demonstrate the potential of this technique to tag multiple fibers with a single frequency and enhance power scaling capability.
We proposed a novel method to fabricate liquid-core photonic crystal fibers by utilizing a ring-core hollow optical fiber, which could overcome the previous structural limitation, enhance the light coupling efficiency, and prevent the liquid evaporation.
We experimentally study spot size reduction by using radially polarized beam for subsurface silicon integrated circuit microscopy. Metallic lines fabricated on a silicon substrate with linewidth / spacing ∼ 130nm / 70nm were resolved through the substrate at λ0 = 1310nm.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.