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We demonstrate time synchronization of two optical oscillators across a turbulent 4-km free-space link. The time offset between oscillators is below 4 fs at minute timescales with less than 50 fs wander over 40 hours.
We report a mid-infrared femtosecond OPO based on CdSiP2 tunable across 6786–7069 nm, generating record power of 110-mW at 7μm, with passive power and wavelength stability below 3% rms (1-hour) and 0.1% rms (15-min), respectively.
We report on ZnGeP2-based parametric sources pumped by holmium lasers which are resonantly pumped by thulium fiber lasers. Using this scheme, we have built one source with up to 22 W average power and another with more than 0.2 J pulse energy in the mid-infrared region.
We present a broadband tunable two-color optical parametric oscillator. The single cavity is capable of generating two idlers that are separated up to 30 THz. Fourier transform spectroscopy with this source has been demonstrated for multi-gas detection.
We present a record-low threshold power of 7 mW at ∼1.55 μm for on-chip optical parametric oscillation using a high quality factor micro-ring-resonator in a new nonlinear photonics platform: AlGaAs-on-insulator.
We demonstrate a novel method for controlling the modal trajectories of Bloch oscillations initiated on the edge of a honeycomb lattice, via the topology of its band structure.
Damage of high-performance optics by ultrashort laser pulses is attributed to the laser-induced ionization and electron excitation. New theoretical models and current state of knowledge in the field are overviewed and critically analyzed based on the recent developments and results.
An electro-optically spectrum tailorable intracavity optical parametric oscillator (IOPO) was built based on a novel integrated aperiodically poled lithium niobate. Spectral narrowing and manipulation of the IOPO signal was demonstrated simply by electro-optic control.
We demonstrate a compact 290 fs, 0.5 mJ laser source at 2-μm wavelength generated from mJ-level 3.4-ps pulses from a fiber laser seeded Ho:YLF regenerative amplifier system via pulse compression in a gas-filled Kagome type HC-PCF.
Scanning voltage microscopy results clearly show that the formation of electric field domains is responsible for the missing of lasing operation in a resonant-phonon based terahertz quantum cascade laser with a highly diagonal transition.
An offset-free frequency comb generated by difference frequency mixing is established and characterized. mHz-level direct locking of the repetition rate to 85Rb and reference-limited linewidth narrowing via an extra-cavity electro-optic modulator are demonstrated.
We demonstrate a new method for pump-probe spectroscopy by applying arbitrary detuning asynchronous optical sampling (AD-ASOPS) to two independent amplified laser systems. The resulting time dynamics ranges from 400 fs up to 1 ms.
Combining high-time resolution optical spectroscopy and time-dependent density functional theory calculations, we provide strong evidence for the role of vibronic coupling in driving the initial steps of the current photogeneration in an organic photovoltaic system.
The superradiant spontaneous emission is caused by the collective interaction of quantum emitters. Such collective interaction also exists in nanoscale resonant thermal emitters, resulting in the analog of superradiance in thermal emission.
Cavity-enhanced interferometry is used to resolve the displacement of a 4.3 MHz nanobeam oscillator with an imprecision 40 dB below that at the standard quantum limit. Employing this measurement as an error signal, radiation pressure is used to feedback cool the oscillator to 5.3 mechanical quanta.
We present the first experiments of spontaneous oscillatory behavior in binary-solvent nanofluids, which occurs when collimated light grazes menisci. The robust heat cycles identify nanobubbles, new mechanisms for probing nanoparticle-solvent chemistry, and novel thermo-mechanical dynamics.
We report 50-milli-Hertz-linewidth optomechanical oscillation of a silica microsphere immersed in a buffer solution. Using the microsphere as a nanosensor, single 10-nm-radius silica beads and Bovine serum albumin (BSA) protein molecules were detected.
We report a deep-mid-IR femtosecond OPO based on CdSiP2 using direct synchronous pumping by a Ti:sapphire laser, providing continuous wavelength coverage across 6–8 μm under rapid static cavity delay tuning with high output stability.
We report on a single-frequency nested cavity OPO based on OP-GaAs, pumped by a pulsed Tm:YAP microlaser. The threshold energy is 10 μJ and temperature tuning enables to cover the 10.3–10.9 μm range.
We report a fully-stabilized synchronously-pumped optical parametric oscillator frequency comb at 1-GHz repetition frequency, comprising pump, signal and idler combs as well as combs at their sum-frequency and second-harmonic frequencies.
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