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We demonstrate 6dB improvement in phase noise of a mode-locked semiconductor laser using coherent photon seeding, achieving a record linewidth of 29kHz. The complete photonic-circuit including the feedback cavity is integrated on a single chip.
OPCPA laser systems require a high-quality, high-energy picosecond pump. The challenges of energy scaling in multi-kilohertz systems include thermal loads, depolarization and gain extraction. We address these issues for a high energy/average power MOPA System.
We demonstrate optical pulse synthesis through coherent combination of AOM-separated light by phase-locking feedback from an FPGA. An order of magnitude improvement in phase stability is shown, limited by the noise of the AOM driver.
We experimentally demonstrate Anderson localization for optical pulses in time domain, using a photonic mesh lattice implemented with coupled optical fiber loops. We also discuss interplay of photonic band-gaps and disorder in such lattices.
We report on a chirped-pulse regenerative thin-disk amplifier generating 220 mJ pulse energy at 1 kHz repetition rate with a pulse duration of 1.9 ps for pumping few-cycle optical parametric amplifiers (OPA).
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.
A three-stage optical parametric amplifier is built to produce 1 kHz, 31 fs, ∼200 μJ signal pulses with tunable wavelengths. Red-activatable channelrhodopsin in fruit fly is optimally two-photon excited to copulation behavior at 1250 nm.
A chirped-pulse amplification technique is implemented for the first time in a picosecond CO2 laser. A considerable increase in peak power is achieved, mainly as a result of eliminating nonlinear effects in the optical elements.
We report on a first experimental demonstration of locking a doubly-resonant Fabry-Perot cavity to burst-mode picosecond ultraviolet (UV) pulses by using a temperature controlled dispersion compensation method. This technique will eventually enable the intra cavity power enhancement of burst-mode 402.5MHz/50ps UV laser pulses with a MW level peak power required for the laser assisted H− beam stripping...
We have developed 64-pixel free-space-coupled arrays of WSi SNSPDs as a pathfinder for the ground detector in a deep-space optical communication system. Our receiver prototype was used to close a real-time deep-space optical communication link at 47 Mbps.
We report the first ultrafast mid-infrared (IR) spectroscopy in monolayer MoS2. The observed mid-IR dynamics show multiple, yet broadened absorption, indicating the predominant intraexcitonic transition from the ground to the higher-lying excitonic states.
We demonstrate a front-end of an Yb-based passively CEP-stable, two-octave wide, two-channel optical parametric synthesizer driven by slightly sub-picosecond pump pulses from a multi-mJ regenerative amplifier at 1 kHz.
We report on a compact, high-energy, cryogenically-cooled Yb:YAG bulk-amplifier delivering energies > 100 mJ at 200 Hz repetition rate with excellent beam quality and spectrum supporting 5-ps pulses.
Laser damage of interference coatings is investigated with 1.6μm wavelength, 2 picosecond pulses from an optical parametric chirped pulse amplification system. 7 J/cm2 damage thresholds are achieved and deviation from conventional damage models is reported.
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