Abstract
We proposed a multimode interference (MMI) fiber based saturable absorber using bismuth telluride at ∼2 μm region. Our MMI based saturable absorber was fabricated by fusion splicing with single mode fiber and null core fiber. The MMI functioned as both wavelength fixed filter and saturable absorber. The 3 dB bandwidth and insertion loss of MMI were 42 nm and 3.4 dB at wavelength of 1958 nm, respectively. We have also reported a passively mode locked thulium doped fiber laser operating at a wavelength of 1958 nm using a multimode interference. A temporal bandwidth of ∼46 ps was experimentally obtained at a repetition rate of 8.58 MHz.
Original language | English |
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Article number | 055103 |
Journal | Laser Physics Letters |
Volume | 13 |
Issue number | 5 |
DOIs | |
State | Published - May 2016 |
Keywords
- fibre lasers
- mode locking
- modulation
- tuning