A passively harmonically mode‐locked soliton erbium‐doped fiber laser with low pumping threshold using a single‐walled carbon nanotubes

Abstract

We demonstrate a passively harmonically mode‐locked soliton Erbium‐doped fiber laser (EDFL) with low pumping threshold using single‐walled carbon nanotubes (SWCNTs) embedded in poly ethylene oxide (PEO) thin film as a passive saturable absorber. The film with a thickness of 50 μm was fabricated using a prepared homogeneous SWCNT solution with 0.1% loading percentage, which was mixed with a diluted PEO solution and casted onto a glass petri dish to form a thin film by evaporation technique. The film is sandwiched between two fiber connectors to construct a saturable absorber, which is then integrated in an EDFL cavity to generate a stable passive mode‐locking of a soliton laser operating at 1560 nm at the 4th, 7th, and 15th harmonic of fundamental cavity frequency when the pump powers of 1480 nm laser diode are 14.9, 17.5, and 20.1 mW, respectively. The 4th harmonic pulses are characterized in detail with a repetition rate of 44.84 MHz, a transform‐limited pulse width of 1.19 ps, side‐mode suppression ratio of larger than 20 dB and pulse energy of 9.14 pJ. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:799–803, 2015

Dispersive Fourier Transform Spectrometer Based on Mode-Locked Er-Doped Fiber Laser for Ammonia Sensing

“…Consequently, the generation of picosecond pulses in erbium lasers has previously been achieved by integrating filters with sufficiently large spectral widths, such as a Lyot filter [22] or a tunable interferometric filter [23]. Techniques like controlling effective losses with an attenuator [24] and polarization control [25] can also facilitate lasing near 1530 nm.…”

Dispersion variation in ring‐type erbium‐doped fiber ultrashort pulse laser with single‐wall carbon nanotube‐based tapered fiber saturable absorber

“…It can provide high velocity pulses, which is an effective method of processing a variety of materials without excessive heat input [1]. Fiber laser-based mode-locking generation is an area of interest for research due to its strong light confinement over very long distance and the simplicity of gain generation using doped fiber amplifying medium [4][5][6][7][8][9][10].…”

“…Fiber‐based ultrashort pulse generation utilizing erbium‐doped fiber (EDF) gain medium is of particular interest as its operating wavelength resides over the low‐loss window of optical fibers. In recent years, the focus has been on the use of single‐wall carbon nanotubes (SWCNT), which have been proven to be an effective saturable absorber option due to their ultrafast recovery time and polarization insensitivity . Transmission‐type SWCNT‐polymer composite films are typically chosen for use in fiber lasers as they are compact, inexpensive, and easy to fabricate.…”