Abstract
In the paper, a passively mode-locked erbium-doped fiber ring laser in the long-wavelength band (L-band) is presented by using a single-wall nanotube saturable absorber (SWNT-SA). The optical properties of the SWNT-SA are compared with those in the C-band in view of the absorbance spectrum and the power-dependent transmittance of the SWNT-SA film. The effects of the net cavity dispersion and the length of the erbium-doped fiber (EDF) on L-band stretched pulse generation are discussed. The designed stretched-pulse L-band laser has a net dispersion of 0.017-ps2 and generates ultrashort (110 fs), broad-spectrum (41 nm) pulses with a signal-to-noise ratio over 70 dB.
Highlights
Because of their ability to provide ultrashort pulse durations and a broad spectrum, passively mode-locked lasers have received much attention in various fields of science and industry such as pump-probe spectroscopy, optical coherence tomography (OCT), terahertz timedomain spectroscopy (THz-TDS), telecommunications [1, 2], and etc
We demonstrated the singlewall nanotube saturable absorber (SWNT-SA) based erbium-doped fiber ring laser operating in the long-wavelength band (L-band) region
It was shown that the SWNTs produced by high-pressure CO (HiPCO) process have almost same modulation depth at wavelength of 1560 nm and 1590 nm
Summary
Because of their ability to provide ultrashort pulse durations and a broad spectrum, passively mode-locked lasers have received much attention in various fields of science and industry such as pump-probe spectroscopy, optical coherence tomography (OCT), terahertz timedomain spectroscopy (THz-TDS), telecommunications [1, 2], and etc. Popa et al designed a stretched pulse laser modelocked by an SWNT-SA film and successfully generated a pulse with a 74-fs duration and 63-nm bandwidth [6]. The pulse energy, spectral width and pulse duration amounted to only 0.027 nJ, 5.7 nm, and ~498 ± 16 fs, respectively These limited properties come from soliton mode-locking. The reported spectral width and pulse duration were 11.2 nm and 460 fs, respectively, which indicates improvement over the soliton modelocking regime [16] Despite these recent interests, reports on SWNT-SAs-based ultrafast pulse generation covering the L-band is rare and requires detailed analyses. We present an SWNT-SA mode-locked stretched-pulse laser design that yields a wide spectral width and short pulse duration in the L-band region. The characteristics of the output pulse with respect to the EDF length and net cavity dispersion are investigated and discussed
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