Abstract
We demonstrate a dissipative soliton fiber laser with high pulse energy (>30 nJ) based on a single-walled carbon nanotube saturable absorber (SWCNT-SA). In-line SA that evanescently interacts with the high quality SWCNT/polymer composite film was fabricated under optimized conditions, increasing the damage threshold of the saturation fluence of the SA to 97 mJ/cm(2). An Er-doped mode-locked all-fiber laser operating at net normal intra-cavity dispersion was built including the fabricated in-line SA. The laser stably delivers linearly chirped pulses with a pulse duration of 12.7 ps, and exhibits a spectral bandwidth of 12.1 nm at the central wavelength of 1563 nm. Average power of the laser output is measured as 335 mW at an applied pump power of 1.27 W. The corresponding pulse energy is estimated to be 34 nJ at the fundamental repetition rate of 9.80 MHz; this is the highest value, to our knowledge, reported in all-fiber Er-doped mode-locked laser using an SWCNT-SA.
Highlights
Mode-locked all-fiber lasers generating ultra-short optical pulses have been intensively studied with their merits including alignment-free structure, excellent spatial beam profile, and compactness [1]
We demonstrate a dissipative soliton fiber laser with high pulse energy (>30 nJ) based on a single-walled carbon nanotube saturable absorber (SWCNT-saturable absorbers (SAs))
In-line SA that evanescently interacts with the high quality SWCNT/polymer composite film was fabricated under optimized conditions, increasing the damage threshold of the saturation fluence of the SA to 97 mJ/cm2
Summary
Mode-locked all-fiber lasers generating ultra-short optical pulses have been intensively studied with their merits including alignment-free structure, excellent spatial beam profile, and compactness [1]. In a passively mode-locked fiber laser, saturable absorbers (SAs), i.e., optical components exhibiting a nonlinear response of optical absorption to the incident optical intensity, are necessarily used for initiating and stabilizing the pulsed laser operation. There have been previous researches on all-fiber mode-locked lasers with high pulse energy using an SWCNT- or graphene-SAs on an SPF [17, 20], large absorption loss with a strong polarization dependence of the SA limits the fiber laser output power (174 mW) and the pulse energy (~10 nJ). We observed that defects were developed above a saturation fluence energy of 97 mJ/cm, which is a much higher threshold than reported value (~100 μJ/cm2) [21] in the SWCNT-SA on fiber ferrules
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