Low-threshold 1.9µm Raman generation in microstructured hydrogen-filled hollow-core revolver fibre with nested capillaries

Abstract

Efficient Raman laser based on the revolver hollow-core fibre (HCF) with a cladding formed by one layer of double nested capillaries was realized for the first time. Using hydrogen gas as a nonlinear medium we demonstrated single-pass single-stage 1064 nm-1907 nm Raman conversion with quantum efficiency as high as 40%. Improved mode confinement in the hollow core and low optical losses of the fibre enabled us to achieve Raman threshold as low as 270 W of peak power, which is 4-7 times improvement compared to previously reported results on 1.9 µm Raman generation in other types of HCFs. Further progress in revolver fibre technology could be a promising way to develop low-threshold, efficient, compact gas fibre lasers for various applications in the mid-infrared spectral range.

Efficient 4.42 Μm Raman Laser Based on Hollow-Core Silica Fiber

“…[18]) and on published data on the vibrational Raman linewidth and scattering cross-section of 1 H 2 [19,20]. This method of calculation was previously verified in [21,22], where g R ≈ 1 cm/GW was calculated for the 1.06 → 1.91 µm vibrational SRS in accordance with experimental data.…”

“…The nsition of sponds to 587 cm -1 ). 6b, blue solid curve; see also [21]), whereas the asymmetry of output pump pulses is a signature of a transient SRS regime (Fig. 6c, blue solid curve).…”

In-line polarization controller for hollow core photonic bandgap fiber

“…), we should see a trace that follows a meridian on the Poincare sphere, passing through the North and South poles, which corresponds to circularly polarized light and χ = 45 o maximum ellipticity). As shown in [15], maximum χ (χ max ) obtained when rotating the input HWP can be attributed to the phase difference between the principal axes of polarization of the FUT, with two extremes (χ max = 0 o , χ = ±45 o ) described above.…”

“…4. As follows from [15], the relation between χ max and the phase difference between light propagating along the two FUT principal axes of polarization follows sin…”

The Design Optimization and Experimental Investigation of the 4.4 μm Raman Laser Basedon Hydrogen-filled Revolver Silica Fiber

“…6 shows the dependences P core fibers, which were modeled as a HCW and TF with a cm. It was assumed that the hollow core was filled by molecular hydrogen ( 1 was assumed to be 1.2 cm/GW [15]. The minimum m and is 700 W. In the chalcogenide TF, the minimum is reached approximately at the same diameter and is 126 W. In HCW minima are also attained at 75 μm with an accuracy of 1 at the minimum for this case reach 10 5 W. in an optical fiber of the HCW-type the threshold pump power of a 4.4 75 kW.…”