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50 results on '"Bang, Ole"'

16. Largely tunable dispersion chirped polymer FBG

Author

Min, Rui, primary, Korganbayev, Sanzhar, additional, Molardi, Carlo, additional, Broadway, Christian, additional, Hu, Xuehao, additional, Caucheteur, Christophe, additional, Bang, Ole, additional, Antunes, Paulo, additional, Tosi, Daniele, additional, Marques, Carlos, additional, and Ortega, Beatriz, additional

Published
2018
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19. Power stable 1.5–10.5??µm cascaded mid-infrared supercontinuum laser without thulium amplifier

Author

Woyessa, Getinet, Kwarkye, Kyei, Dasa, Manoj K., Petersen, Christian R., Sidharthan, Raghuraman, Chen, Shaoxiang, Yoo, Seongwoo, and Bang, Ole

Abstract

We demonstrate a simple and power stable 1.5–10.5 µm cascaded mid-infrared 3 MHz supercontinuum fiber laser. To increase simplicity and decrease cost, the design of the fiber cascade is optimized so that no thulium amplifier is needed. Despite the simple design with no thulium amplifier, we demonstrate a high average output power of 86.6 mW. Stability measurements for seven days with 8–9 h operation daily revealed fluctuations in the average power with a standard deviation of only 0.43% and a power spectral density stability of ±0.18dBm/nm for wavelengths <10µm. The high-repetition-rate, robust, and cheap all-fiber design makes this source ideal for applications in spectroscopy and imaging.

Published
2021

20. Multi-wavelength high-energy gas-filled fiber Raman laser spanning from 1.53??µm to 2.4??µm

Author

Adamu, Abubakar I., Wang, Yazhou, Habib, Md. Selim, Dasa, Manoj. K., Antonio-Lopez, J. E., Amezcua-Correa, Rodrigo, Bang, Ole, and Markos, Christos

Abstract

In this work, we present a high-pulse-energy multi-wavelength Raman laser spanning from 1.53 µm up to 2.4 µm by employing the cascaded rotational stimulated Raman scattering effect in a 5 m hydrogen (H_2)-filled nested anti-resonant fiber, pumped by a linearly polarized Er/Yb fiber laser with a peak power of ∼13kW and pulse duration of ∼7ns in the C-band. The developed Raman laser has distinct lines at 1683 nm, 1868 nm, 2100 nm, and 2400 nm, with pulse energies as high as 18.25 µJ, 14.4 µJ, 14.1 µJ, and 8.2 µJ, respectively. We demonstrate how the energy in the Raman lines can be controlled by tuning the H_2 pressure from 1 bar to 20 bar.

Published
2021

33. Observation of two-dimensional nonlocal gap solitons

Author

Rasmussen, Per Dalgaard, primary, Bennet, Francis H., additional, Neshev, Dragomir N., additional, Sukhorukov, Andrey A., additional, Rosberg, Christian R., additional, Krolikowski, Wieslaw, additional, Bang, Ole, additional, and Kivshar, Yuri S., additional

Published
2009
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48. High-power supercontinuum lasers with a flat blue spectrum through pump modulation: a numerical study.

Author

Eilkaer Hansen R, Meldgaard Moltke A, and Bang O

Abstract

We numerically investigate high-power, modulational instability-based supercontinuum sources. Such sources have spectra that reach the infrared material absorption edge and as a result the spectrum has a strong narrow blue peak (dispersive wave group velocity matched to solitons at the infrared loss edge) followed by a significant dip in the neighboring longer-wavelength region. In a wide range of applications one prefers a broader and more flat blue part within a certain minimum and maximum power spectral density. From the perspective of fiber degradation it would be desirable to achieve this at reduced pump peak powers. We show that it is possible to improve the flatness by more than a factor of 3 by modulating the input peak power, although this comes at the expense of slightly higher relative intensity noise. Specifically, we consider a standard 6.6 W, 80 MHz supercontinuum source with a 455 nm blue edge, which uses 7 ps pump pulses. We then modulate its peak power to generate a pump pulse train having two and three different sub-pulses.

Published
2023
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49. High pulse energy and quantum efficiency mid-infrared gas Raman fiber laser targeting CO 2 absorption at 4.2  µm.

Author

Wang Y, Dasa MK, Adamu AI, Antonio-Lopez JE, Habib MS, Amezcua-Correa R, Bang O, and Markos C

Abstract

In this Letter, we demonstrate a high pulse energy and linearly polarized mid-infrared Raman fiber laser targeting the strongest absorption line of ${\rm CO}&#95;2$CO 2 at $\sim{4.2}\;\unicode {x00B5} {\rm m}$∼4.2µm. This laser was generated from a hydrogen (${\rm H}&#95;2$H 2 )-filled antiresonant hollow-core fiber, pumped by a custom-made 1532.8 nm Er-doped fiber laser delivering 6.9 ns pulses and 11.6 kW peak power. A quantum efficiency as high as 74% was achieved, to yield 17.6 µJ pulse energy at 4.22 µm. Less than 20 bar ${\rm H}&#95;2$H 2 pressure was required to maximize the pulse energy since the transient Raman regime was efficiently suppressed by the long pump pulses.

Published
2020
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50. Broadband light generation at approximately 1300 nm through spectrally recoiled solitons and dispersive waves.

Author

Falk P, Frosz MH, Bang O, Thrane L, Andersen PE, Bjarklev AO, Hansen KP, and Broeng J

Abstract

We experimentally study the generation of broadband light at approximately 1300 nm from an 810 nm Ti:sapphire femtosecond pump laser. We use two photonic crystal fibers with a second infrared zero-dispersion wavelength (lambda Z2) and compare the efficiency of two schemes: in one fiber lambda Z2=1400 nm and the light at 1300 nm is composed of spectrally recoiled solitons; in the other fiber lambda Z2=1200 nm and the light at 1300 nm is composed of dispersive waves.

Published
2008
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