A passively Q-switched all-fiber laser is demonstrated using a 10-cm-long bismuth-doped fiber(BDF) as a saturable absorber(SA). The dual-wavelength operation was obtained due to the nonlinear effect inside the fabrica...A passively Q-switched all-fiber laser is demonstrated using a 10-cm-long bismuth-doped fiber(BDF) as a saturable absorber(SA). The dual-wavelength operation was obtained due to the nonlinear effect inside the fabricated BDF, which has a high germanium content. Stable Q-switched pulses were obtained at the dual synchronous wavelengths of 1 530.1 nm and 1 531.1 nm. When the pump power is tuned from 105.3 mW to 191.0 mW, the repetition rate can be varied from 82.6 kMz to 117.6 kHz. The maximum pulse energy and average output power were 83.4 nJ and 9.8 mW, respectively while the minimum pulse width was 8.5 μs at the maximum pump power of 191.0 mW. Our results indicate that BDF could be a promising alternative optical modulator for pulsed fiber laser application.展开更多
This paper demonstrated a Q-switched erbium-doped fiber laser(EDFL)using an organic saturable absorber(SA)based on 8-HQCdCl_(2)H_(2)O material.The organic thin film was prepared using the casting process.The proposed ...This paper demonstrated a Q-switched erbium-doped fiber laser(EDFL)using an organic saturable absorber(SA)based on 8-HQCdCl_(2)H_(2)O material.The organic thin film was prepared using the casting process.The proposed Q-switched EDFL has a maximum repetition rate of 143 kHz,minimum pulse duration of 1.85μs and the highest pulse energy of 167 nJ.The Q-switched peak laser was at a central wavelength of 1531 nm with a 3 dB bandwidth of 3.52 nm and power intensity of 2.64 dBm.展开更多
In this letter,single-walled carbon nanotubes(SWCNT)coating was used on the D-shaped silica fiber for ethanol sensing in aqueous solution.The performance of this structure as an ethanol sensor was studied here by moni...In this letter,single-walled carbon nanotubes(SWCNT)coating was used on the D-shaped silica fiber for ethanol sensing in aqueous solution.The performance of this structure as an ethanol sensor was studied here by monitoring output power variation and wavelength shift with changing ethanol concentration.In the concentration range of 5%—50%of ethanol,the SWCNT coated structure showed an improved sensitivity compared to the uncoated sample.The sensitivity is improved from 0.0135 dB/%to 0.0409 dB/%with the coating.The SWCNT coated sample also showed a peak wavelength shift of 0.1 nm with the change of ethanol concentration in the same range.展开更多
Q-switched erbium doped fiber laser(EDFL)was passively realized using vanadium pentoxide(V_(2)O_(5))embedded into polyethylene glycol(PEG)film as saturable absorber(SA).The laser could successfully generate stable sel...Q-switched erbium doped fiber laser(EDFL)was passively realized using vanadium pentoxide(V_(2)O_(5))embedded into polyethylene glycol(PEG)film as saturable absorber(SA).The laser could successfully generate stable self-starting pulses when the V_(2)O_(5)film was placed in an EDFL cavity.It operated at 1562.4 nm wavelength.The repetition rate can be varied from 91.7 kHz to 128.2 kHz while the pulse width shrank from 10.90μs to 7.81μs with rising pump power from 110.9 mW to 166.5 mW.The pulse energy recorded was 3.2 nJ at pump power of 166.5 mW.The results indicate that the saturable absorption of V_(2)O_(5)has promising nonlinear photonic applications especially in fiber laser development for 1.5-μm region.展开更多
A lutetium oxide(Lu_(2)O_(3)) film was proposed and demonstrated for Q-switching operation at 1.55 μm region. It was obtained by solving Lu_(2)O_(3) powder into isopropyl alcohol and mixing the solution into polyviny...A lutetium oxide(Lu_(2)O_(3)) film was proposed and demonstrated for Q-switching operation at 1.55 μm region. It was obtained by solving Lu_(2)O_(3) powder into isopropyl alcohol and mixing the solution into polyvinyl alcohol(PVA) solution to form a composite precursor solution via stirring, sonicating, and centrifuging processes. The thin film was formed through a drop and dry process and a small piece of this film was integrated into erbium-doped fiber laser(EDFL) cavity to modulate the cavity loss via Q-switching mechanism for pulse generation. The Q-switched laser operated at 1 565 nm with the repetition rate of 75.26 k Hz as the pump power was raised to the maximum value of 145.83 m W. The maximum pulse energy of 41.85 n J was recorded at 145.83 m W pump power. The mode-locked pulse operated at 968.5 k Hz with a pulse width of 510 ns was also realized in an extended EDFL cavity. The simple and cost-effective laser should have various applications including material processing, sensing and biomedical areas.展开更多
Passively Q-switched thulium doped fiber laser(TDFL)has been successfully demonstrated using gold nanoparticles(GNPs),which were embedded into polyvinyl alcohol as saturable absorber(SA).The stable self-starting Q-swi...Passively Q-switched thulium doped fiber laser(TDFL)has been successfully demonstrated using gold nanoparticles(GNPs),which were embedded into polyvinyl alcohol as saturable absorber(SA).The stable self-starting Q-switched laser was generated to operate at 1891 nm when a tiny piece of the prepared film was slot in between two fiber ferrules and incorporated into the laser cavity.The repetition rate can be adjusted from 48.54 kHz to 49.64 kHz while the pulse width decreased from 3.52μs to 2.38μs with the increase of 1550 nm pump power from 840 m W to 930 m W.The corresponding pump power output power linearly increased from 3.62 m W to 6.3 m W with a slope efficiency of 2.53%.The maximum peak power and pulse energy were recorded at about 39 m W and 0.12μJ,respectively at pump power of 930 m W.The Q-switching operation was caused by the surface plasmon resonance absorption of GNPs.展开更多
In this letter,a humidity sensor is demonstrated by applying a whispering gallery mode(WGM)from a microsphere resonator onto the ZnO nanorods coated glass surface.The diameter of the microsphere was 234μm and the gla...In this letter,a humidity sensor is demonstrated by applying a whispering gallery mode(WGM)from a microsphere resonator onto the ZnO nanorods coated glass surface.The diameter of the microsphere was 234μm and the glass surface was coated with ZnO nanorods using the hydrothermal method at growth duration of 12 h.A significant response to humidity level ranging from 35%RH to 85%RH has been observed with the sensitivity of 0.0142 nm/%RH.The proposed humidity sensor has successfully employed to enhance interaction between the whispering gallery mode evanescent and surrounds analyte with the assistance of ZnO nanorods coated glass.展开更多
In this paper,we have successfully demonstrated a Q-switched pulse generation utilizing lutetium oxide(Lu2O3)thin film based saturable absorber(SA)in all-fiber erbium-doped fiber laser(EDFL)cavity with a bidirectional...In this paper,we have successfully demonstrated a Q-switched pulse generation utilizing lutetium oxide(Lu2O3)thin film based saturable absorber(SA)in all-fiber erbium-doped fiber laser(EDFL)cavity with a bidirectional pumping.The Lu2O3 powder is mixed with isopropyl alcohol(IPA)solution before we add polyvinyl alcohol(PVA)as our host polymer to make the Lu2O3 into a thin film.By inserting the Lu2O3-PVA thin film into a bidirectional pumped EDFL cavity,a stable Q-switched pulse is realized with repetition rate in a range of rose from 43.67 k Hz to 57.74 k Hz whereas the pulse width decreased from 14.48μs to 11.20μs.This result indicates that the Lu2O3 can be implemented as an SA device in an EDFL as it owns a linear absorption of around 3 d B at 1567 nm.展开更多
文摘A passively Q-switched all-fiber laser is demonstrated using a 10-cm-long bismuth-doped fiber(BDF) as a saturable absorber(SA). The dual-wavelength operation was obtained due to the nonlinear effect inside the fabricated BDF, which has a high germanium content. Stable Q-switched pulses were obtained at the dual synchronous wavelengths of 1 530.1 nm and 1 531.1 nm. When the pump power is tuned from 105.3 mW to 191.0 mW, the repetition rate can be varied from 82.6 kMz to 117.6 kHz. The maximum pulse energy and average output power were 83.4 nJ and 9.8 mW, respectively while the minimum pulse width was 8.5 μs at the maximum pump power of 191.0 mW. Our results indicate that BDF could be a promising alternative optical modulator for pulsed fiber laser application.
基金supported by the Airlangga University Grant Scheme(2023)。
文摘This paper demonstrated a Q-switched erbium-doped fiber laser(EDFL)using an organic saturable absorber(SA)based on 8-HQCdCl_(2)H_(2)O material.The organic thin film was prepared using the casting process.The proposed Q-switched EDFL has a maximum repetition rate of 143 kHz,minimum pulse duration of 1.85μs and the highest pulse energy of 167 nJ.The Q-switched peak laser was at a central wavelength of 1531 nm with a 3 dB bandwidth of 3.52 nm and power intensity of 2.64 dBm.
基金supported by the INTI Research Grant Scheme 2020(No.INTI-FITS-03-2020)the Airlangga University Grant Scheme 2021。
文摘In this letter,single-walled carbon nanotubes(SWCNT)coating was used on the D-shaped silica fiber for ethanol sensing in aqueous solution.The performance of this structure as an ethanol sensor was studied here by monitoring output power variation and wavelength shift with changing ethanol concentration.In the concentration range of 5%—50%of ethanol,the SWCNT coated structure showed an improved sensitivity compared to the uncoated sample.The sensitivity is improved from 0.0135 dB/%to 0.0409 dB/%with the coating.The SWCNT coated sample also showed a peak wavelength shift of 0.1 nm with the change of ethanol concentration in the same range.
基金the University of Malaya(No.ML001-2017B)Airlangga University Research Grant(2021)
文摘Q-switched erbium doped fiber laser(EDFL)was passively realized using vanadium pentoxide(V_(2)O_(5))embedded into polyethylene glycol(PEG)film as saturable absorber(SA).The laser could successfully generate stable self-starting pulses when the V_(2)O_(5)film was placed in an EDFL cavity.It operated at 1562.4 nm wavelength.The repetition rate can be varied from 91.7 kHz to 128.2 kHz while the pulse width shrank from 10.90μs to 7.81μs with rising pump power from 110.9 mW to 166.5 mW.The pulse energy recorded was 3.2 nJ at pump power of 166.5 mW.The results indicate that the saturable absorption of V_(2)O_(5)has promising nonlinear photonic applications especially in fiber laser development for 1.5-μm region.
基金supported by the Airlangga University Grant Scheme (2022)。
文摘A lutetium oxide(Lu_(2)O_(3)) film was proposed and demonstrated for Q-switching operation at 1.55 μm region. It was obtained by solving Lu_(2)O_(3) powder into isopropyl alcohol and mixing the solution into polyvinyl alcohol(PVA) solution to form a composite precursor solution via stirring, sonicating, and centrifuging processes. The thin film was formed through a drop and dry process and a small piece of this film was integrated into erbium-doped fiber laser(EDFL) cavity to modulate the cavity loss via Q-switching mechanism for pulse generation. The Q-switched laser operated at 1 565 nm with the repetition rate of 75.26 k Hz as the pump power was raised to the maximum value of 145.83 m W. The maximum pulse energy of 41.85 n J was recorded at 145.83 m W pump power. The mode-locked pulse operated at 968.5 k Hz with a pulse width of 510 ns was also realized in an extended EDFL cavity. The simple and cost-effective laser should have various applications including material processing, sensing and biomedical areas.
基金supported by the University of Malaya(No.MLOO1-2017B).
文摘Passively Q-switched thulium doped fiber laser(TDFL)has been successfully demonstrated using gold nanoparticles(GNPs),which were embedded into polyvinyl alcohol as saturable absorber(SA).The stable self-starting Q-switched laser was generated to operate at 1891 nm when a tiny piece of the prepared film was slot in between two fiber ferrules and incorporated into the laser cavity.The repetition rate can be adjusted from 48.54 kHz to 49.64 kHz while the pulse width decreased from 3.52μs to 2.38μs with the increase of 1550 nm pump power from 840 m W to 930 m W.The corresponding pump power output power linearly increased from 3.62 m W to 6.3 m W with a slope efficiency of 2.53%.The maximum peak power and pulse energy were recorded at about 39 m W and 0.12μJ,respectively at pump power of 930 m W.The Q-switching operation was caused by the surface plasmon resonance absorption of GNPs.
基金supported by the National Natural Science Foundation of China(Nos.U1304608 and 61774053)the Project of Henan Provincial Department of Science and Technology(No.182102410047)the Program of Henan Polytechnic University(No.B2014-020)。
文摘In this letter,a humidity sensor is demonstrated by applying a whispering gallery mode(WGM)from a microsphere resonator onto the ZnO nanorods coated glass surface.The diameter of the microsphere was 234μm and the glass surface was coated with ZnO nanorods using the hydrothermal method at growth duration of 12 h.A significant response to humidity level ranging from 35%RH to 85%RH has been observed with the sensitivity of 0.0142 nm/%RH.The proposed humidity sensor has successfully employed to enhance interaction between the whispering gallery mode evanescent and surrounds analyte with the assistance of ZnO nanorods coated glass.
基金support from Higher Council of Turkey under the Mevlana Program(Project No.MEV.2019-1750)Kütahya Dumlup?nar University(Project No.DPU.2020-20)。
文摘In this paper,we have successfully demonstrated a Q-switched pulse generation utilizing lutetium oxide(Lu2O3)thin film based saturable absorber(SA)in all-fiber erbium-doped fiber laser(EDFL)cavity with a bidirectional pumping.The Lu2O3 powder is mixed with isopropyl alcohol(IPA)solution before we add polyvinyl alcohol(PVA)as our host polymer to make the Lu2O3 into a thin film.By inserting the Lu2O3-PVA thin film into a bidirectional pumped EDFL cavity,a stable Q-switched pulse is realized with repetition rate in a range of rose from 43.67 k Hz to 57.74 k Hz whereas the pulse width decreased from 14.48μs to 11.20μs.This result indicates that the Lu2O3 can be implemented as an SA device in an EDFL as it owns a linear absorption of around 3 d B at 1567 nm.
