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The recent findings of line narrowing in Raman-active continuous-wave-pumped gas [1] showed that the Stokes scattering occurs in a Lamb-Dicke regime and is associated to formation of array of deep subwavelength nanotraps, which resulted in a sub-recoil linewidth Stokes radiation [1]. The results also showed that this nanotrap lattice exhibits a macroscopic motion. Here we present theoretical and numerical...
Hollow-core photonic crystal fibers (HC-PCF) opened new perspectives towards multi-octave comb generation and waveform synthesis using stimulated Raman scattering (SRS) generation in gases introduced in its core [1, 2]. In the transient regime of SRS [3], a short pump pulse combined to a high gain can amplify a few spatial-temporal modes (STM) from the quantum noise. It is even possible to have only...
Last years have seen the emergence of a new class of hollow-core photonic crystal fibers (HC-PCF) no longer relying on photonic bandgap guidance but on inhibited-coupling (IC) mechanism. The first specie of this fiber family took the form of Kagome-lattice [1]. The guiding rule for enhancement of such a guidance (minimizing the coupling between the core mode and cladding mode, i.e (φclad |Δn2| φcore...
A new way to reach the Lamb-Dicke regime in molecular gases has been reported in [1]. This is achieved by trapping H2 molecule during Stimulated Raman Scattering (SRS) in a photonic band gap hollow-core fiber (PBG HC-PCF) pumped with a high power CW laser [1]. The molecular trapping process occurs in a self-assembled manner, whereby the Raman active molecules are confined in nanometer-wide sections...
The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their continuous expansion use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters. Recently, a new branch of hollow-core photonic crystal fiber (HC-PCF) based on inhibited coupling (IC) mechanism has been proposed and successfully applied to demonstrate the delivery of...
Recent results in laser beam delivery and ultra-short pulse (USP) compression using hypocycloid-core Kagome hollow-core photonic crystal fibers (HC-PCFs) [1] proved that this type of optical fiber is an excellent candidate as a photonic component for these applications. For example, it has been demonstrated that the fiber guides up to 1 mJ of600 fs long pulses with no damage, and by a simple choice...
The development of the Raman gas-filled hollow core photonic crystal fibers allow to exacerbate the light-matter interaction with extremely high efficiency. Among the nonlinear optical effect that were extensively explored we count stimulated Raman scattering, with demonstrations like over 5-octaves wide Raman comb using H2-filled inhibited coupling guiding HC-PCF pumped with a picosecond pulsed laser...
We polarized ground-state population thermal-Rb in inner-wall core-coated and uncoated Kagome HC-PCFs and measured its relaxation-time rate and its dependence with the pumping-laser intensity and detuning. Enhancement in relaxation-time in coated fibers is observed.
In a new Lamb-Dicke regime of stimulated-Raman-scattering, hydrogen molecules are deeply-trapped in self-nanostructured optical lattice to emit watt-level CW Stokes-radiation with sub-Doppler resolved spectral sidebands and with a sub-recoil linewidth as low as ∼3 kHz.
Contrast and finesse of a 19-cell hollow-core photonic bandgap fiber resonator are experimentally investigated. The results show compatibility with medium to high performance rotation sensing applications, while minimizing the Kerr effect.
We report the highest pulse energy from a mid-IR acetylene-filled hollow-core fiber laser. The 1.41 μJ, ns pulses are emitted at 3.11 μm and 3.17 μm with 30 Hz repetition rate, ∼20% overall efficiency at 9.8 torr.
We propose and demonstrate parametric four-wave mixing in a Raman active gas. Two lasers with a 1.7 THz frequency-difference in a strongly-driven Raman rotational-transition of D2 generate sidebands with frequency-spacing equal to the lasers frequency-difference.
The spectral-structure evolution of the first-order Stokes in H2-filled inhibited coupling Kagome HC-PCF pumped by high-power picosecond laser is reported. The Stokes-spectrum bandwidth and structure is found to evolve strongly with the pump-power.
We report on experimental observation of sub-Doppler transparencies in Rb filled HC-PCF. A theoretical analysis shows that they result from the optical pumping of wall trapped atoms into off-resonant spin state.
We developed an inhibited-coupling Kagome HC-PCF with its fundamental transmission-band shifted down to 670 nm while maintaining its hypocycloidal core-contour resulting in a very broad single-band with a loss of 30 dB/km.
Several UV-VIS-NIR guiding HC-PCFs are fabricated. One exhibits a loss of 7.7 dB/km at ∼750 nm and guides down to 220 nm. A second exhibits ultra-broad fundamental-band with losses < 20 dB/km over 600–1200 nm.
A ∼1000 THz wide and 150 nJ/nm energy spectral-density supercontinuum, and a Raman comb wider than 300 THz are generated in atmospheric air-confined in inhibited coupling Kagome fibers for the first time.
We report on recent results toward development of tunable and miniaturized UV-DUV radiation using microwave-driven plasma-core photonic crystal fiber. Gas-mixture optimized UV-DUV emission and highly efficient microwave ring resonators couplers are demonstrated.
We report on tapered inhibited coupling Kagome-fiber with a down-ratio as large as 2.4 while maintaining the hypocycloid-core shape. The insertion-loss of SMF spliced to tapered Kagome-fiber was measured with minimum of 0.48dB at 1550nm.
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.
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