Narrow-linewidth broadly tunable Yb-doped Q-switched fiber laser using multimode interference filter

Abstract

A narrow-linewidth broadly tunable Yb-doped Q-switched fiber laser using an acousto-optic modulator and multimode interference filter (MMIF) in the linear bulk cavity resonator and an all-fiber ring cavity resonator has been demonstrated. Insertion of an MMIF in the linear cavity resonator using bulk components decreased the spectral bandwidth of the Q-switched signal by two orders of magnitude from 11 to less than 0.1 nm. Spectral tunability of more than 16 nm in the range from 1057 to 1073 nm has also been achieved by the combination of MMIF and a standard polarization controller (SPC). A decrease in the pulse duration with a decrease in the spectral bandwidth of the output signal has also been recorded. The pulse duration of the Q-switched signal was reduced from ∼305 to ∼240 ns by the introduction of the MMIF in the resonator at the same value of the input pump power. In the case of the all-fiber Q-switched ring cavity resonator, the spectral bandwidth of the Q-switched signal was reduced by two orders of magnitude from ∼17 to less than 0.1 nm due to the introduction of the MMIF in the resonator. The spectral tunability of more than 12 nm in the range from 1038 to 1050 nm was achieved by an MMIF and an SPC.

Wavelength Tuning of Multimode Interference Fiber Lasers: A Review

“…[ 29 ] Following up on this work, a few years later, in 2017, Chakravarty et al, extended the laser tuning of a Yb MMI fiber laser to a QS operation. [ 30 ] They achieved laser tuning over 16 nm, in the range from 1057 to 1073 nm. A similar PC‐based stress‐optic implementation was reported by Khattak et al, in 2018, where they coiled a long MMI filter (1 m‐long) in a PC pad to tune an Er MMI fiber laser.…”

“…Summary of the central wavelength and the tuning range of wavelength‐tuned MMI fiber lasers tracked over time. Squares (orange) markers indicate ytterbium MMI fiber lasers: a) Selvas et al [ 13 ] b) Anzueto et al [ 14 ] c) Mukhopadhyay et al [ 29 ] d) Chakravarty et al [ 30 ] Circles (green) markers indicate Erbium MMI fiber lasers: e) Castillo et al [ 15 ] f) Castillo et al [ 16 ] g) Walbaum et al [ 26 ] h,i) Ma et al, [ 21,22 ] j) Antonio et al, [ 20 ] k) Ahmad et al [ 28 ] l) Khattak et al [ 31 ] m) Li et al [ 34 ] n) Zhang et al [ 32 ] Triangles (purple) markers indicate Thulium MMI fiber lasers: o) Ma et al [ 23 ] p) Zhang et al [ 33 ] q) Li et al [ 27 ] r) Ibarra et al [ 24 ] s,t) Sakata et al [ 25 ] u) Li et al [ 35 ] v,w) Sakata et al [ 36 ] The diamond and down triangle indicate exceptional cases where special light sources were used for Erbium, x) Antonio et al, [ 20 ] and Thulium, y) Yan et al [ 37 ] , respectively (see text for details).…”

Vector dark–bright pulses from a ytterbium doped fiber laser mode-locked by nonlinear multimode interference

“…Multimode interference (MMI) in optical fibers has been used for several practical applications viz. sensors [1][2][3], wavelength tunable laser sources [4,5], multi-wavelength laser sources [6], high power fiber lasers with good beam quality [7], and more recently as saturable absorbers (SAs) for Q-switching and mode-locking in different rare earth doped fiber lasers [8,9]. Mode-locking operation in fiber lasers using MMI based SA has been demonstrated in various operating regimes viz.…”

Tunable optical fiber cascade filter by magneto-optical effect

“…The structure is widely used as senor (Tian et al, 2018, AL-Janaby and AL-Dergazly, 2020, fiber filter (Zhang et al 2020, Álvarez-Tamayo et al, 2016, Chakravarty et al, 2017, recently, it is used as filter in CW optical parametric oscillation (OPO) cavity (Yu et al, 2020, Tang et al, 2019 since the nonlinear effect require low loss filter. The filter is used to tune Er (Khattak et al 2018, Yuxin et al, 2018, Walbaum and Fallnich, 2011 , Yb (Zhang et al, 2012, Sánchez et al 2006, Selvas et al 2005, and Tm (X.…”