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We report an efficient, high-energy, diode-pumped Yb:CaF2 regenerative amplifier. Energies up to 1.02 mJ at 1045-nm and 5 kHz-repetition rate in 324 fs-long pulses have been obtained with a beam quality factor of M2 =1.1.
We present a fully integrated mid-infrared sensor. The laser and detector are fabricated from a bi-functional quantum cascade structure, connected through a dielectric-loaded surface plasmon waveguide, which acts as interaction zone and provides high coupling.
We demonstrate optofluidic microlasers based on liquid microdroplets stabilized by a superhydrophobic surface. Lasing is achieved using highly efficient non-radiative Förster resonance energy transfer between donor and acceptor molecules placed within the droplets.
Open-access microcavities are an original approach for lab-on-a-chip optofluidic sensing since they offer a direct access to the confined electromagnetic field. This work describes their basic characteristics for refractive index and nanoparticle sensing.
Repeatability of resonance detection for on-chip microring resonators is systematically studied. An efficient interferometric method is presented to improve the accuracy by more than one order of magnitude in an 8 nm bandwidth, without any temperature control.
We experimentally demonstrate avalanche sub bandgap detection of light at 1550 nm wavelength via surface states using the configuration of interleaved PN junctions along a silicon waveguide. The device operates in a fully depleted mode.
We demonstrated antenna-assisted mid-infrared graphene detectors at room temperature with more than 200 times enhancement of responsivity (0.4 V/W at λ0=4.45 µm) compared to devices without antennas (<2 mV/W).
Broadly tunable single-mode quantum cascade laser at ∼10 µm with a monolithically integrated two-section slot structure is presented. The device shows ∼80 cm−1 tuning range and ∼20 dB side mode suppression ratio by adjusting the currents and temperature.
Using an optofluidic chip with an integrated nanopore, a mixture of nanobeads and influenza viruses were opto-electrically detected. Different types of nanoparticles can be distinguished by different fluorescence wavelengths and fluorescence correlation functions.
By combining first and second order DFB gratings, a new solution for surface emission QCL is presented. A QWS mode and a buried hetero-structure process allow single mode emission and low dissipation devices.
The non-uniform electric field in the active regions of an interband cascade laser is directly imaged and characterized for the first time by employing a nanoscopic voltage profiling technique.
We demonstrate a new time-of-flight stabilization technique based on all-fiber-loop optical-microwave phase detectors. The demonstrated relative frequency instability between 2.856-GHz signals separated by a 2.3-km fiber link is 6.5×10−19 at 82500-s averaging time.
We present a novel feed-forward laser linewidth reduction scheme. The linewidth of a DFB laser is reduced from 9.4MHz to 37.2kHz. Sixteen modes of a mode-locked laser are simultaneously reduced from ∼20MHz to below 300kHz.
We achieved a sub-fs thermal-noise-limited noise floor in a balanced optical-microwave phase detector and demonstrated long-term stable RF extraction with <1 fs RMS drift and <7 fs pk-pk for over 10 hours of continuous operation.
We focus a short writing pulse burst into a photo-resist, polymerizing a voxel. The time-resolved transmission of a co-focused second laser probes the voxel formation dynamics. We measure time constants as small as 400 µs.
Low-loss nonlinear AlGaAs waveguides are fabricated using plasma-assisted photoresist reflow. A 6.8-dB continuous-wave four-wave mixing conversion efficiency in a 1.35-µm-wide waveguide, and a 44-nm half-width 3-dB bandwidth in a 0.65-µm-wide waveguide are demonstrated.
We present a chalcogenide microwire device that acts as a compact (∼11 cm length, ∼1 µm diameter) and power efficient (sub-Watt threshold peak power, >2% slope efficiency) Raman-parametric laser, wavelength converter and ultra-broadband supercontinuum generator/amplifier.
Monolayer graphene sheet has been integrated on top of small disk optical resonator in SOI platform. Electro-optic interaction between graphene and whispering gallery mode of the cavity has been demonstrated and studied for modulation application.
We present a highly efficient laterally-coupled 1.55 µm DFB laser monolithically integrated with multistage MMIs and SOAs, using low bias currents and providing an output power of ∼100 mW with a low divergence angle.
We present the experimental observation of the slow-light enhancement effect on the generation of a frequency comb formed by stimulated Brillouin scattering (SBS) in a chip scale As2S3 rib waveguide.
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