Flexible pulse-controlled fiber laser

Abstract

Controlled flexible pulses have widespread applications in the fields of fiber telecommunication, optical sensing, metrology, and microscopy. Here, we report a compact pulse-controlled all-fiber laser by exploiting an intracavity fiber Bragg grating (FBG) system as a flexible filter. The width and wavelength of pulses can be tuned independently by vertically and horizontally translating a cantilever beam, respectively. The pulse width of the laser can be tuned flexibly and accurately from ~7 to ~150 ps by controlling the bandwidth of FBG. The wavelength of pulse can be tuned precisely with the range of >20 nm. The flexible laser is precisely controlled and insensitive to environmental perturbations. This fiber-based laser is a simple, stable, and low-cost source for various applications where the width-tunable and/or wavelength-tunable pulses are necessary.

Widely tunable Tm-doped mode-locked all-fiber laser

“…Fiber Bragg grating is another method that is commonly used. The shift of the wavelength is achieved when temperature, strain and/or pressure are applied to the fiber Bragg grating171819. Another straightforward way is to use a tunable Fabry-Perot filter20, and the novel Fabry-Perot filters are based on microstructured fiber or micro-fiber21, micro-electro-mechanical system22, semiconductor modulator23, etc.…”

Effect of narrow spectral filter position on the characteristics of active similariton mode-locked femtosecond fiber laser

“…This means that, active similariton is a possible mode-locking regime with this specification of the saturable absorber. However, if the saturation intensity of the saturable absorber is increased as reported in [23], the value of BW th will be increased to be 4.83 nm. Therefore, the generation of active similariton will be quite difficult because the bandwidth of the SF is out of the required range in this case.…”

Fiber-integrated tungsten disulfide saturable absorber (mirror) for pulsed fiber lasers

“…1,2 Mainly two schemes are selected for generating pulsed laser emission-active mode-locking or Qswitching by employing costly and complex electrically driven modulators, [3][4][5] and passive mode-locking or Qswitching by incorporating an artificial or real saturable absorber (SA) as an intensity-dependent optical switch. Compared with active scheme, passive scheme has the advantages of compactness, simplicity, and flexibility.…”