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Dissolution-and-reduction CVD synthesis of few-layer graphene on ultra-thin nickel film lifted off for mode-locking fiber lasers.

Peng KJ, Lin YH, Wu CL, Lin SF, Yang CY, Lin SM, Tsai DP, Lin GR - Sci Rep (2015)

Bottom Line: In contrast, the reflection-type SA only compresses the pulsewidth from 875 to 796 fs with corresponding spectral linewidth broadened from 2.2 to 3.3 nm.The reflection-type graphene mode-locker increases twice of its equivalent layer number to cause more insertion loss than the transmission-type one.Nevertheless, the reflection-type based saturable absorber system can generate stabilized soliton-like pulse easier than that of transmission-type system, because the nonlinearity induced self-amplitude modulation depth is simultaneously enlarged when passing through the graphene twice under the retro-reflector design.

View Article: PubMed Central - PubMed

Affiliation: Graduate Institute of Photonics and Optoelectronics, Department of Electrical Engineering, National Taiwan University (NTU), No.1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China.

ABSTRACT
The in-situ dissolution-and-reduction CVD synthesized few-layer graphene on ultra-thin nickel catalyst film is demonstrated at temperature as low as 550 °C, which can be employed to form transmission-type or reflection-type saturable absorber (SA) for mode-locking the erbium-doped fiber lasers (EDFLs). With transmission-type graphene SA, the EDFL shortens its pulsewidth from 483 to 441 fs and broadens its spectral linewidth from 4.2 to 6.1 nm with enlarging the pumping current from 200 to 900 mA. In contrast, the reflection-type SA only compresses the pulsewidth from 875 to 796 fs with corresponding spectral linewidth broadened from 2.2 to 3.3 nm. The reflection-type graphene mode-locker increases twice of its equivalent layer number to cause more insertion loss than the transmission-type one. Nevertheless, the reflection-type based saturable absorber system can generate stabilized soliton-like pulse easier than that of transmission-type system, because the nonlinearity induced self-amplitude modulation depth is simultaneously enlarged when passing through the graphene twice under the retro-reflector design.

No MeSH data available.


The schematic diagram of transmission-type passively mode locked EDFL.The passively mode-locked EDFL system with the graphene saturable absorber attached on the end-face of SMF patchcord.
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f5: The schematic diagram of transmission-type passively mode locked EDFL.The passively mode-locked EDFL system with the graphene saturable absorber attached on the end-face of SMF patchcord.

Mentions: These fiber pigtails with few-layer graphene were placed in the passively mode-locked EDFL system, as illustrated in Fig. 5. This system is also known as transmission-type passively mode-locked EDFL used in previous reports44. The 2-m long EDF served as the gain medium. The EDF was pumped by laser diodes at 980 and 1480 nm through by wavelength division multiplexer (WDM) couplers. The circulated direction in the EDFL cavity was defined by a polarization independent circulator. The polarization controller was applied to modify the intracavity polarization to optimize the mode locking. A 5% output coupler was used to deliver the EDFL output to optical spectrum analyzer and autocorrelator.


Dissolution-and-reduction CVD synthesis of few-layer graphene on ultra-thin nickel film lifted off for mode-locking fiber lasers.

Peng KJ, Lin YH, Wu CL, Lin SF, Yang CY, Lin SM, Tsai DP, Lin GR - Sci Rep (2015)

The schematic diagram of transmission-type passively mode locked EDFL.The passively mode-locked EDFL system with the graphene saturable absorber attached on the end-face of SMF patchcord.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556966&req=5

f5: The schematic diagram of transmission-type passively mode locked EDFL.The passively mode-locked EDFL system with the graphene saturable absorber attached on the end-face of SMF patchcord.
Mentions: These fiber pigtails with few-layer graphene were placed in the passively mode-locked EDFL system, as illustrated in Fig. 5. This system is also known as transmission-type passively mode-locked EDFL used in previous reports44. The 2-m long EDF served as the gain medium. The EDF was pumped by laser diodes at 980 and 1480 nm through by wavelength division multiplexer (WDM) couplers. The circulated direction in the EDFL cavity was defined by a polarization independent circulator. The polarization controller was applied to modify the intracavity polarization to optimize the mode locking. A 5% output coupler was used to deliver the EDFL output to optical spectrum analyzer and autocorrelator.

Bottom Line: In contrast, the reflection-type SA only compresses the pulsewidth from 875 to 796 fs with corresponding spectral linewidth broadened from 2.2 to 3.3 nm.The reflection-type graphene mode-locker increases twice of its equivalent layer number to cause more insertion loss than the transmission-type one.Nevertheless, the reflection-type based saturable absorber system can generate stabilized soliton-like pulse easier than that of transmission-type system, because the nonlinearity induced self-amplitude modulation depth is simultaneously enlarged when passing through the graphene twice under the retro-reflector design.

View Article: PubMed Central - PubMed

Affiliation: Graduate Institute of Photonics and Optoelectronics, Department of Electrical Engineering, National Taiwan University (NTU), No.1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China.

ABSTRACT
The in-situ dissolution-and-reduction CVD synthesized few-layer graphene on ultra-thin nickel catalyst film is demonstrated at temperature as low as 550 °C, which can be employed to form transmission-type or reflection-type saturable absorber (SA) for mode-locking the erbium-doped fiber lasers (EDFLs). With transmission-type graphene SA, the EDFL shortens its pulsewidth from 483 to 441 fs and broadens its spectral linewidth from 4.2 to 6.1 nm with enlarging the pumping current from 200 to 900 mA. In contrast, the reflection-type SA only compresses the pulsewidth from 875 to 796 fs with corresponding spectral linewidth broadened from 2.2 to 3.3 nm. The reflection-type graphene mode-locker increases twice of its equivalent layer number to cause more insertion loss than the transmission-type one. Nevertheless, the reflection-type based saturable absorber system can generate stabilized soliton-like pulse easier than that of transmission-type system, because the nonlinearity induced self-amplitude modulation depth is simultaneously enlarged when passing through the graphene twice under the retro-reflector design.

No MeSH data available.