Study of a Hi-Bi FOLM for tunable and dual-wavelength operation of a thulium-doped fiber laser

Abstract

We report a study of an all-fiber Tm-doped fiber laser with tunable single wavelength emission and dual-wavelength generation operating in different laser wavelength ranges depending on the Tm-doped fiber (TDF) length. The wavelength selection and tuning for single wavelength laser operation and the adjustment of cavity losses for dual wavelength laser operation is obtained by temperature variations of the high birefringence fiber loop in a fiber optical loop mirror. Stable dual wavelength operation is achieved at the single wavelength tuning limits when cavity losses are balanced to generate two simultaneous laser lines with equal powers. A linear cavity fiber laser setup with TDF lengths of 2, 4, 8 and 12 m is used to obtain tunable single wavelength operation in a range of ~40 nm for each TDF length. A total tuning range of ~110 nm with the four different TDF lengths is achieved. At dual-wavelength laser operation the wavelength separation was ~48 nm. The maximal power efficiency of ~34.9% with a maximum output power of 274 mW was obtained with the use of TDF length of 4 m.

Tunable dual-wavelength operation of an all-fiber thulium-doped fiber laser based on tunable fiber Bragg gratings

“…These techniques are based on the use of an optical device which allows the adjustment of the intra-cavity losses to reduce competition between the generated laser lines [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In our experience, we have demonstrated stable dual-wavelength laser emission of TDFL based on the use of a FOLM with Hi-Bi fiber loop [24,25]. The use of the Hi-Bi FOLM allows the fine adjustment of the cavity losses between the generated laser lines with stability improvement.…”

Stable Multi-Wavelength Thulium-Doped All-Fiber Laser Incorporating a Multi-Cavity Fabry–Perot Filter

“…From these results, side mode suppression ratios of 42.5, 43.5 and 29 dB are observed at the corresponding wavelength emissions. However, these side mode suppression ratios could be re-adjusted by changing the length of active fiber [22].…”

Thermoactivated cavitation induced in water by low power, continuous wave thulium-doped fiber laser

“…This TDFL was experimentally demonstrated and characterized in Ref. 18. A thulium-doped fiber (TDF, CoreActive SCF-TM-8/125) with a length of 10 m was used as a gain medium to generate laser emission in the wavelength range of 1950 nm.…”