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Enhancing Q-Switched Fiber Laser Performance Based on Reverse Saturable and Saturable Absorption Properties of CuCrO Nanoparticle-Polyimide Films.
ACS Appl Mater Interfaces
May 2021
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qian-Jin Street, Changchun 130012, People's Republic of China.
We demonstrate CuCrO (CCO) nanoparticle (NP)-polyimide (PI) composite film as a saturable absorber (SA) to regulate the output characteristics of passively Q-switched fiber laser at 1.55 μm. Based on the reverse saturable and saturable absorptions of the CCO NP-PI film, the passively Q-switched fiber laser expressed two stages with the increase of pump power for substantial performance enhancement.
View Article and Find Full Text PDFWe experimentally study the nonlinear dynamics of a femtosecond ytterbium doped mode-locked fiber laser. With the laser operating in the pulsed regime a route to chaos is presented, starting from stable mode-locking, period two, period four, chaos and period three regimes. Return maps and bifurcation diagrams were extracted from time series for each regime.
View Article and Find Full Text PDFLamb dip CRDS of highly saturated transitions of water near 1.4 μm.
J Chem Phys
February 2018
Université Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.
Doppler-free saturated-absorption Lamb dips were measured at sub-Pa pressures on rovibrational lines of HO near 7180 cm, using optical feedback frequency stabilized cavity ring-down spectroscopy. The saturation of the considered lines is so high that at the early stage of the ring down, the cavity loss rate remains unaffected by the absorption. By referencing the laser source to an optical frequency comb, transition frequencies are determined down to 100 Hz precision and kHz accuracy.
View Article and Find Full Text PDFIn this report, we demonstrate a wide multiwavelength Brillouin-erbium fiber laser (MBEFL) with improved flatness that integrates a micro-air cavity. This air-gap introduces a cavity loss to overcome the gain saturation as well as providing efficient pump recycling scheme through Fresnel back-reflection. In addition, the efficient four-wave mixing in the highly nonlinear fiber contributes to the self-flattening of the output spectra.
View Article and Find Full Text PDFSaturation dynamics and working limits of saturated absorption cavity ringdown spectroscopy.
Phys Chem Chem Phys
August 2016
Institute of Physical Chemistry, University of Kiel, Max-Eyth-Str. 1, 24118 Kiel, Germany. and KMS Kiel Marine Science - Centre for Interdisciplinary Marine Sciences, University of Kiel, Olshausenstr. 40, 24098 Kiel, Germany.
Cavity ringdown spectroscopy (CRDS) in the linear absorption regime is a well-established method for sensitive trace gas detection, but only a few studies have addressed quantitative measurements in the presence of a saturated sample. In fact, saturation is usually avoided in order to escape from the required complex modeling of the saturation process that depends on the characteristics of the absorbing species, its interaction with the surrounding gas as well as on the temporal and spectral characteristics of the cavity excitation. Conversely, the novel saturated-absorption cavity ringdown spectroscopy approach (SCAR/Sat-CRDS) takes advantage of sample saturation in order to allow one to extract both the gas absorption and the empty cavity loss rates from a single ringdown event.
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