TUNABLE ULTRA-LONG RANDOM DISTRIBUTED FEEDBACK FIBER LASER

A 72 km open-ended symmetrical tunable random distributed feedback fiber laser (RDB-FL) with different pumping schemes is presented in this study. The random distributed feedback was contributed by Rayleigh scattering in the single-mode fiber while distributed gain was provided by the effect of stimulated Raman scattering. The pumping schemes tested with the configuration was outward and inward pumping, where these would be backward and forward pumping in a non-symmetrical configuration of a fiber laser, respectively. The tuning range was also varied in conjunction with the different pumping schemes to determine the optimum performance. Random lasing in the RDB-FL was achieved by utilizing multiple scattering in the disordered gain medium to achieve resonance. With pump power limited to 1.5 W, the best threshold was measured as low as 1.4 W while the highest total output power was at 8 mW. In outward pumping configuration, the wavelengths that are within the maximum Raman gain (1555-1565 nm) show the best peak powers and total output power with a narrow linewidth, as low as 0.25 nm.

Download Full-text

Over 19 W Single-Mode 1545 nm Er,Yb Codoped All-Fiber Laser

Advances in Condensed Matter Physics ◽

10.1155/2017/7408565 ◽

2017 ◽

Vol 2017 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Jiadong Wu ◽

Chunxiang Zhang ◽

Jun Liu ◽

Ting Zhao ◽

Weichao Yao ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Stimulated Raman Scattering ◽

Maximum Output Power ◽

Laser Cavity ◽

Single Mode ◽

Transverse Mode ◽

Spectral Width ◽

Maximum Output ◽

Silica Fibers

We report a high-power cladding-pumped Er,Yb codoped all-fiber laser with truly single transverse mode output. The fiber laser is designed to operate at 1545 nm by the use of a pair of fiber Bragg gratings (FBGs) to lock and narrow the output spectrum, which can be very useful in generating the eye-safe ~1650 nm laser emission through the Stimulated Raman Scattering (SRS) in silica fibers that is of interest in many applications. Two pieces of standard single-mode fibers are inserted into the laser cavity and output port to guarantee the truly single-mode output as well as good compatibility with other standard fiber components. We have obtained a maximum output power of 19.2 W at 1544.68 nm with a FWHM spectral width of 0.08 nm, corresponding to an average overall slope efficiency of 31.9% with respect to the launched pump power. This is, to the best of our knowledge, the highest output power reported from simple all-fiber single-mode Er,Yb codoped laser oscillator architecture.

Download Full-text

Monitoring of single-mode fiber laser heating using Rayleigh scattering and first order fs-PbP fiber Bragg grating

10.1117/12.2265795 ◽

2017 ◽

Author(s):

Rudy Desmarchelier ◽

Romain Cotillard ◽

Nicolas Roussel ◽

Steven Armiroli ◽

Guillaume Laffont

Keyword(s):

Fiber Laser ◽

Fiber Bragg Grating ◽

Laser Heating ◽

Rayleigh Scattering ◽

Single Mode ◽

Single Mode Fiber ◽

Bragg Grating ◽

First Order

Download Full-text

Single-mode Yb-free Er-doped all-fiber laser cladding-pumped at 976 nm with record efficiency of 40 % and output power of 75 W

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC ◽

10.1109/cleoe-iqec.2013.6801349 ◽

2013 ◽

Author(s):

L. Kotov ◽

M. Likhachev ◽

M. Bubnov ◽

O. Medvedkov ◽

M. Yashkov ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Laser Cladding ◽

Single Mode ◽

Er Doped

Download Full-text

Experimental and theoretical study of single-mode 1018 nm ytterbium-doped fiber laser with 100 W output power

Frontiers in Optics 2017 ◽

10.1364/ls.2017.lth3f.6 ◽

2017 ◽

Cited By ~ 1

Author(s):

Jian-Hung Lin ◽

Wei-Ting Lin ◽

Chiang-Hsin Lin ◽

Wei-Lin Chen ◽

Wen-Cheng Huang ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Theoretical Study ◽

Single Mode

Download Full-text

Analysis of the stability of multiple-phase-shift distributed-feedback semiconductor lasers

Canadian Journal of Physics ◽

10.1139/p93-006 ◽

1993 ◽

Vol 71 (1-2) ◽

pp. 29-38 ◽

Cited By ~ 1

Author(s):

Yves Champagne ◽

Nathalie McCarthy

Keyword(s):

Phase Shift ◽

Semiconductor Lasers ◽

Output Power ◽

Longitudinal Mode ◽

Single Mode ◽

Distributed Feedback ◽

Hole Burning ◽

Lasing Wavelength ◽

Multiple Phase ◽

The Stability

The effects of the longitudinal spatial hole burning on the static lasing characteristics of a specific configuration of distributed-feedback semiconductor laser with three phase-shift regions are investigated using a numerical approach. A serious degradation of the stability of the optimum design, having the flattest axial intensity distribution at low output power, is predicted for drive levels beyond a critical value. The lasing wavelength exhibits a sudden shift (wavelength chirping), along with a significant degradation of the single-mode character of the longitudinal-mode spectrum. Thus, the potentialities of this multiple-phase-shift structure to provide a stable narrow-linewidth emission at high output power appear to be less than expected from results calculated for the near-threshold regime. Nevertheless, it is found that a multiple-phase-shift configuration that departs slightly from the optimum case suffices to recover most of the promises expected from this distributed-feedback laser design.

Download Full-text

Hybrid Raman-Erbium Random Fiber Laser with a Half Open Cavity Assisted by Artificially Controlled Backscattering Fiber Reflectors

10.21203/rs.3.rs-192136/v1 ◽

2021 ◽

Author(s):

R. A. Perez-Herrera ◽

P. Roldan-Varona ◽

M. Galarza ◽

S. Sañudo-Lasagabaster ◽

L. Rodriguez-Cobo ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Signal To Noise Ratio ◽

Power Level ◽

Laser Cavity ◽

Gain Medium ◽

Optical Signal ◽

Open Cavity ◽

Output Power Level ◽

Erbium Doped

Abstract A hybrid Raman-erbium random fiber laser (RFL) with a half-open cavity assisted by chirped artificially controlled backscattering fiber reflectors (ACBFRs) is presented. A combination of 2.4 km of dispersion compensating fiber (DCF) with two highly erbium-doped fiber (EDF) pieces of 5 m length was used as gain medium. A single random laser emission line centered at 1553.8 nm with an output power level of -6.5 dBm and an optical signal to noise ratio (OSNR) of 47 dB was obtained when pumped at 37.5 dBm. A full width at half maximum (FHWM) of 1 nm and a 100% confidence level (CL) output power instability as low as 0.08 dB were measured. The utilization of the new laser cavity as a temperature and strain sensor is also experimentally studied.

Download Full-text