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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.


Passively mode-locked EDFL performances.(a) The Gain and output power (in dBm) of EDFA versus input power. (b) The curves of Pout (in mW) vs. pumping currents of the transmission-type and reflection-type graphene saturable absorber mode-locked EDFL systems.
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f7: Passively mode-locked EDFL performances.(a) The Gain and output power (in dBm) of EDFA versus input power. (b) The curves of Pout (in mW) vs. pumping currents of the transmission-type and reflection-type graphene saturable absorber mode-locked EDFL systems.

Mentions: To perform the passive mode-locking at appropriate pumping condition, the intracavity gain of the EDFL was determined under bi-directional pumping regime. The relationship of the output power and the intracavity gain versus input power is shown in Fig. 7(a). The output power is kept linearly increased with almost constant gain of 32 dB under input power of smaller than −10 dBm, which becomes saturated at 21 dBm with corresponding gain decaying to 21 dB under an input power of 0 dBm. The relationship between lasing power and pumping current for both types of passively mode-locked EDFL systems are shown in Fig. 7(b). The maximal lasing power extracted from 5% output coupler of the EDFL system passively mode-locked by transmission-type and reflection-type graphene saturable absorbers are 5.9 and 5 mW, respectively.


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)

Passively mode-locked EDFL performances.(a) The Gain and output power (in dBm) of EDFA versus input power. (b) The curves of Pout (in mW) vs. pumping currents of the transmission-type and reflection-type graphene saturable absorber mode-locked EDFL systems.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f7: Passively mode-locked EDFL performances.(a) The Gain and output power (in dBm) of EDFA versus input power. (b) The curves of Pout (in mW) vs. pumping currents of the transmission-type and reflection-type graphene saturable absorber mode-locked EDFL systems.
Mentions: To perform the passive mode-locking at appropriate pumping condition, the intracavity gain of the EDFL was determined under bi-directional pumping regime. The relationship of the output power and the intracavity gain versus input power is shown in Fig. 7(a). The output power is kept linearly increased with almost constant gain of 32 dB under input power of smaller than −10 dBm, which becomes saturated at 21 dBm with corresponding gain decaying to 21 dB under an input power of 0 dBm. The relationship between lasing power and pumping current for both types of passively mode-locked EDFL systems are shown in Fig. 7(b). The maximal lasing power extracted from 5% output coupler of the EDFL system passively mode-locked by transmission-type and reflection-type graphene saturable absorbers are 5.9 and 5 mW, respectively.

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.