Here we present a coherent pulse stacking approach for up-scaling energy of a solid-state femtosecond chirped pulse amplifier. We demonstrate pulse splitting into four replicas, amplification in a specially designed regenerative amplifier cavity, and phase-locked stacking into one dominant pulse. An optimized regenerative amplifier design for non-overlapping pulse train amplification is presented.
A single-frequency Nd:YAG ring laser operating on the Laguerre-Gaussian LG01 mode with well determined handedness of helical phase front is demonstrated. We show that by reversing the lasing direction the handedness can be changed.
Coherent beam combining of a record number of 19 fibers is demonstrated with 300fs pulses. This result is achieved by controlling both phase and delay variations on each fiber channel in an interferometric measurement setup.
Self-similar evolution in a comb-like dispersion-decreasing fiber inside an erbium fiber laser is demonstrated. The laser generates 37-fs and 1.3-nJ pulses, which equal the shortest from an Er fiber laser but with 4 times the peak power.
Focused light spots at the output of a multimode fiber amplifier have been shaped by profiling the input signal wavefront using adaptive optimization, despite of mode coupling, mode dependent gain and saturation.
Error-free 20-Gb/s directly-modulated transmission is achieved by enhancing the dispersion tolerance of a III-V/SOI DFB laser with a silicon micro-ring resonator. Low (∼0.4 dB) penalty compared to back-to-back without ring is demonstrated after 5-km SSMF.
We demonstrate frequency stabilization of a continuous-wave laser using an integrated TiO2 athermal cavity as a reference for the first time, and show linewidth improvement by a factor of 6 compared to a SiN cavity.
We demonstrate BER performance <10⁁−9 for a 1 Tb/s/core transmission over 7-core fiber and SDM switching using a novel silicon photonic integrated circuit composed of a 7×7 fiber switch and low loss SDM couplers.
We report a continuously tunable optical delay line with the maximum delay > 1ns by combining digital switchable delay line and microring slow light structures built on the 60-nm-thick silicon waveguide platform.
Spatial-spectral holographic real-time correlative matched filtering of high bandwidth signals is demonstrated. Simple text searches for long phrases in PSK formatted optical data streams at rates up to 100 Gbps are presented.
The thermally-driven motion of a nanomechanical resonator may be employed as an absolute thermometer. We experimentally measure radiation pressure shot noise induced quantum correlations to absolutely calibrate the motional signal transduced onto an optical probe.
We present the first proof-of-principle spectroscopic measurements with purely passive dispersive Fourier transformation femtosecond stimulated Raman scattering, with which the acquisition of the full Raman scattering spectrum is possible within microseconds.
We report a novel breakup scenario of ultra-short high-order solitons in optical waveguides, via formation of a shock far below subcycle level, followed by a dramatic and complete transition into a dispersive wave.
We show that soliton-modelocked silicon nitride microresonators are highly stable against external perturbations. Modelocking is maintained even for relatively large RMS pump-power noise and thermal shifts, which represents a key feature for potential applications.
We introduce a new nonlinear oscillator model governing the spontaneous creation of ultrashort pulses in Kerr-nonlinear parametric oscillators. This model explains the π and π/2 steps in our phase spectrum measurements of microresonator-based frequency combs.
We experimentally investigate the design of a high-repetition rate source delivering well-separated optical pulses due to the nonlinear compression of a dual-frequency beat signal within a cavity-less normally dispersive fiber-based setup.
580μJ nanosecond pulses at a repetition rate of 25kHz with user-defined temporal pulse shapes and a radially polarized doughnut-shaped spatial mode have been demonstrated in an Yb-doped fiber MOPA system seeded by a super-luminescent diode.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.