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We report recent progress on the J-KAREN laser upgrade to realize 1022 W/cm2 intensity at 0.1 Hz. Our current high-spatiotemporal-quality broadband pulses of over 20 J will be further amplified in the final amplifier.
We demonstrated 0.9 mJ terahertz pulses by optical rectification of a high-energy Cr:Mg2SiO4 laser in large organic crystal. The emitted spectrum covers 0.1–5 THz and the peak fields exceed 42 MV/cm and 14 Tesla.
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 survey the latest advances in initiation and observation of quantum coherent interactions in room temperature quantum dot amplifiers operating at 1550 nm. Single and double pulse FROG measurements accompanied by detailed modeling are described.
We describe an experimental demonstration of fiber-based optical phase-sensitive amplification for improved detection of correlated single-photon pairs. A measured coincidence gain of 4.5dB provides 3dB improvement in the detection system signal-to-noise ratio.
We demonstrate an on-chip optical spectrum analyzer (OSA) using two cascade optical ring resonators. The OSA's span is wider than 50nm and resolution is ∼0.1nm. A germanium photodetector and a p-i-n modulator are integrated on the chip and used for detection.
A symbol rate identification method is proposed for optical signals with commonly used modulation formats. Numerical simulation and experimental results show it is accurate and robust to different link impairments.
Stable operation with energy >100mJ of the Yb:YAG thin disk regenerative amplifier at 1kHz has been achieved. The amplifier is being developed as a pump for the picosecond OPCPA of the L1 beamline at ELI-Beamlines.
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.
We demonstrate soliton self-frequency shifted Very-Large-Mode-Area and HigherOrder-Mode fiber amplifiers. The output wavelength is shifted more than 50 nm with a soliton pulse energy of up to 186 nJ. Subsequent, high-efficiency, frequency doubling is 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.
An analytical technique for determining the radiative current in optically pumped gain media is presented. A means of seperately identifying the effects of gain compression and pump non-uniformities in amplified spontaneous emission spectra is introduced.
This paper proposes a phase-insensitive fiber parametric amplifier system that outputs a phase-clamped signal. It consists of an orthogonally pumped fiber with polarization-aligned signal input and a fiber loop with a polarization beam splitter.
Visible up-conversion luminescence induced by 1535-nm excitation in (ErSc)2O3 epitaxial layers are observed. We investigate fast up-conversion rate and propose its suppression structure by photonic band-gap for realizing higher optical gain devices on Si wafers.
Optical phase lock loop circuit for non-degenerate parametric phase sensitive amplifiers with wide signal-idler light frequency spacing is proposed. The proof-of-principle experiment is successfully demonstrated for 40-GHz spaced signal-idler lights using 5-GHz beat signals.
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