All fiber mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45 degrees-plane-by-plane-tilted fiber grating

0518312 - ÚFE 2020 RIV DE eng J - Journal Article
Kanagaraj, Nithyanandan - Theodosiou, A. - Aubrecht, Jan - Peterka, Pavel - Kamrádek, Michal - Kalli, K. - Kašík, Ivan - Honzátko, Pavel
All fiber mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45 degrees-plane-by-plane-tilted fiber grating.
Laser Physics Letters. Roč. 16, č. 9 (2019), č. článku 095104. ISSN 1612-2011. E-ISSN 1612-202X
R&D Projects: GA ČR(CZ) GA17-20049S
Institutional support: RVO:67985882
Keywords : thulium doped fibre * tilted fiber Bragg grating * dissipative soliton * fibre lasers * soliton mode-locking
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.884, year: 2019
Method of publishing: Limited access
https://iopscience.iop.org/article/10.1088/1612-202X/ab39db

Using the novel 45 degrees-plane-by-plane-tilted fiber grating inscribed by a femtosecond laser as an in-line fiber polarizer, we demonstrate an all-fiber passively mode-locked thulium-doped fiber laser. We characterize the grating for polarization-dependent loss, indicating high contrast and broad operating wavelength. The 45 degrees-tilted fiber grating together with polarization controller act as an artificial saturable absorber suitable for mode-locking through nonlinear polarization rotation. By properly pre-adjusting the polarization controller, stable mode-locking is achieved for a pump power in the range of 300 mW-400 mW at 1565nm. Owing to the net anomalous dispersion, a stable mode-locked soliton pulse centered at 1870nm with a pulse width of 862 fs is reported at a fundamental repetition rate of 22.34 MHz. A long-term stability test reveals that the laser is quite stable for 24h under laboratory conditions, confirming the capabilities of the 45 degrees-tilted fiber grating for stable laser operation
Permanent Link: http://hdl.handle.net/11104/0303474