title: Switchable Q-switched and modelocked operation in ytterbium doped fiber laser under all-normal-dispersion configuration.
abstract: We have constructed an Yb-doped fiber laser in all-normal-dispersion configuration which can be independently operated in Q-switched or modelocked configuration with the help of a simple fiber optic ring resonator (FORR). In the presence of FORR, the laser operates in Q-switched mode producing stable pulses in the range of 1 μs-200 ns with repetition rate in the range of 45 kHz-82 kHz. On the other hand, the laser can be easily switched to mode-locked operation by disjoining the FORR loop producing train of ultrashort pulses of ∼5 ps duration (compressible to ∼150 fs) at ∼38 MHz repetition rate. The transmission characteristics of FORR in combination with the nonlinear polarization rotation for passive Q-switching operation is numerically investigated and experimentally verified. The laser can serve as a versatile seed source for power amplifier which can be easily configured for application in the fields that require different pulsed fiber lasers.
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Pranb K
authors.initials: PK
authors.lastname: Mukhopadhyay
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Pradeep K
authors.initials: PK
authors.lastname: Gupta
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Chandra Pal
authors.initials: CP
authors.lastname: Singh
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Amarjeet
authors.initials: A
authors.lastname: Singh
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Sharma
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Kushvinder S
authors.initials: KS
authors.lastname: Bindra
authors.affiliation: Solid State Laser Division, Raja Ramanna Center for Advanced Technology, Indore, M.P. 452013, India.
authors.forename: Shrikant M
authors.initials: SM
authors.lastname: Oak
mesh_terms: D004867:Equipment Design; D007834:Lasers; D015018:Ytterbium
chemical_list: D015018:Ytterbium