We demonstrate an efficient and widely tunable synchronously pumped optical parametric oscillator (OPO) exploiting four-wave mixing (FWM) in a silicon nitride (Si 3 N 4 ) waveguide with inverted tapers. At pump pulse duration of 2 ps, the waveguide-based OPO (WOPO) exhibited high external pump-to-idler conversion efficiency up to −7.64 dB at 74% depletion generation 387 pJ output idler energy around 1.13 μ m wavelength. Additionally, oscillation resulted 64 amplification power spectral...

Abstract Supercontinuum generation enabled a series of key technologies such as frequency comb sources, ultrashort pulse sources in the ultraviolet or mid-infrared, well broadband light for spectroscopic methods biophotonics. Recent advances utilizing higher-order modes have shown potential to boost both bandwidth and modal output distribution supercontinuum sources. However, strive towards breakthrough technology is hampered by limited control over intra- intermodal nonlinear processes...

Abstract Evidence of intermodal dispersive wave generation mediated by cross‐phase modulation (iXPM) between different transverse modes during supercontinuum in silicon nitride waveguides is presented. The formation a higher‐order soliton one strong mode leads to phase second, weak iXPM. enables not only but also within the mode, that otherwise has insufficient power facilitate formation. nonlinear frequency conversion scheme presented here suggests phase‐matching conditions beyond what...

We present a tunable, hybrid waveguide-fiber optical parametric oscillator (OPO) synchronously pumped by an ultra-fast fiber laser exploiting four-wave mixing (FWM) generated in silicon nitride waveguides. Parametric oscillation results 35 dB enhancement of the idler spectral power density comparison to spontaneous FWM, with ability wide wavelength tuning over 86 nm O-band. Measurements threshold and efficiency feedback loop reveal how integration OPO on single chip can be accomplished at...

We present a hybrid waveguide-fiber optical parametric oscillator (OPO) exploiting degenerate four-wave mixing in tantalum pentoxide. The OPO, pumped with ultrashort pulses at 1.55 µm wavelength, generated tunable idler up to 4.1 pJ energy center wavelength between 1.63 and 1.68 µm. An upper bound for the total tolerable cavity loss of 32 dB was found, rendering chip-integrated OPO feasible as compact robust light source.

Abstract When an ultrafast optical pulse with high intensity propagates through transparent material a supercontinuum can be coherently generated by self‐phase modulation, which is essential to many photonic applications in fibers and integrated waveguides. However, the presence of dispersion causes stagnation spectral broadening past certain propagation length, requiring increased input peak power for further broadening. Overcoming such will key achieve practical devices. Here, concept...

We present a light source for coherent anti-Stokes Raman scattering (CARS) based on broadband spontaneous four-wave mixing, with the potential to be further integrated. By using 7 mm long silicon nitride waveguides, which offer tight mode confinement and high nonlinear refractive index coefficient, signal idler pulses were generated 4 nJ of input pulse energy. In comparison fiber-based experiments, energy waveguide length reduced by two orders magnitude, respectively. The residual pump used...

We present tunable waveguide-based optical parametric amplification by four-wave mixing (FWM) in silicon nitride waveguides, with the potential to be set up as an all-integrated device, for narrowband coherent anti-Stokes Raman scattering (CARS) imaging. Signal and idler pulses are generated via FWM only 3 nJ pump pulse energy stimulated using 4 mW of a continuous-wave seed source, resulting 35 dB enhancement spectral power density comparison spontaneous FWM. By waveguides different widths...

We present multi-color imaging by stimulated Raman scattering (SRS) enabled an ultrafast fiber-based light source with integrated amplitude modulation and frame-to-frame wavelength tuning. With a relative intensity noise level of -153.7 dBc/Hz at 20.25 MHz the is well suited for SRS outperforms other concepts imaging. The tunable in under 5 ms per arbitrary step between 700 cm-1 3200 cm-1, which allows addressing resonances from fingerprint to CH-stretch region. Moreover, compact...

We demonstrate the potential of all-optical switches in integrated waveguides based on intermodal cross-phase modulation between transverse modes. For this purpose, differential phase two modes a probe beam was altered by with control propagating only fundamental mode. A switching behavior accomplished spatially filtering resulting multimode interference modes, which changed depending power. All-optical contrast 82% at 1280 nm over frequency range 4.4 THz 1.6 nJ achieved, representing an...

Abstract In contrast to spontaneous Raman scattering, coherent scattering techniques, such as femtosecond stimulated (FSRS), show advantages for many applications. Besides an enhanced signal strength, FSRS is free of a nonresonant background but affected by cross‐phase modulation (XPM). The resulting artifacts in become relevant high pulse intensities (GW/cm 2 ‐regime) and ultrashort pulses ( < ps), both necessary super‐resolution experiments. As the duration crucial parameter XPM well...

We present a hybrid waveguide-fiber optical parametric oscillator (OPO) exploiting degenerate four-wave mixing in tantalum pentoxide. The OPO, pumped with ultrashort pulses at 1.55 $μ$m wavelength, generated tunable idler up to 4.1 pJ energy between 1.63 and 1.68 center wavelength. An upper bound for the total tolerable cavity loss of 32 dB was found, rendering chip-integrated OPO feasible as compact robust light source.

Abstract We demonstrate an improved concept for nearly bandwidth-limited nonlinear pulse compression down to the few-cycle regime in a fiber chain with alternating sign of dispersion. Whereas normally dispersive segments generate bandwidth via self-phase modulation, anomalously recompress broadened spectral by appropriate amount group velocity Nonlinear from 80 fs input pulses 25 at 1560 nm was achieved, resulting factor 3.2. The use specific dispersion-compensating eliminated impact...

Heterodyne coherent anti-Stokes Raman scattering is presented with a single and compact fiber-based light source only, providing the pump Stokes as well local oscillator pulses fixed phase relation. The interferometrically superimposed of CARS signal generated heterodyne gain, scaling LO power, amplifying weak at detection site. functionality this setup was verified by measurements amplification, sample concentration, dependence signal. Additionally, 10-fold suppression non-resonant achieved...

We present pulse compression in a fiber with alternating dispersion sign. Repetitive bandwidth generation and recompression leads to few-cycle pulses. show bandwidth-limited pulses by using special compensating fiber.

Waveguide-based optical parametric amplification by stimulated four-wave mixing in silicon nitride waveguides is presented. The high nonlinearity leads to reduced necessary pump energies and waveguide length. light source was applied for narrow-band Raman imaging.

On-demand single photon sources with a high purity and indistinguishability are the key component for many quantum applications such as cryptography, computation metrology [1]. Quantum dots, which usually pumped picosecond titanium sapphire (Ti:Sa) lasers, have recently proven to be an excellent source these photons [2]. However, use of Ti:Sa lasers requires in-depth expertise laser alignment, bulky cooling devices stabilized optical table, restraining application generated photons.

Fiber-based optical parametric oscillators (OPOs) are versatile and tunable light sources that of high interest for applications such as coherent Raman spectroscopy or imaging [1]. However, using integrated waveguides instead nonlinear fibers gain medium, waveguide-based OPOs (WOPOs) benefit from higher nonlinearity compact size waveguides, which have potential to be used many lab-on-a-chip [2]. To investigate different waveguide geometries the influence WOPOs, we study synchronously pumped...