Doping management for high-power fiber lasers: 100 W, few-picosecond pulse generation from an all-fiber-integrated amplifier
Author
Elahi, P.
Yilmaz, S.
Akçaalan, Ö.
Kalaycioğlu, H.
Öktem, B.
Şenel, Ç.
Ilday, F. Ö.
Eken, K.
Date
2012-07-16Source Title
Optics Letters
Print ISSN
0146-9592
Publisher
Optical Society of America
Volume
37
Issue
15
Pages
3042 - 3044
Language
English
Type
ArticleItem Usage Stats
137
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Abstract
Thermal effects, which limit the average power, can be minimized by using low-doped, longer gain fibers, whereas the presence of nonlinear effects requires use of high-doped, shorter fibers to maximize the peak power. We propose the use of varying doping levels along the gain fiber to circumvent these opposing requirements. By analogy to dispersion management and nonlinearity management, we refer to this scheme as doping management. As a practical first implementation, we report on the development of a fiber laser-amplifier system, the last stage of which has a hybrid gain fiber composed of high-doped and low-doped Yb fibers. The amplifier generates 100 W at 100 MHz with pulse energy of 1 μJ. The seed source is a passively mode-locked fiber oscillator operating in the all-normaldispersion regime. The amplifier comprises three stages, which are all-fiber-integrated, delivering 13 ps pulses at full power. By optionally placing a grating compressor after the first stage amplifier, chirp of the seed pulses can be controlled, which allows an extra degree of freedom in the interplay between dispersion and self-phase modulation. This way, the laser delivers 4.5 ps pulses with ∼200 kW peak power directly from fiber, without using external pulse compression.
Keywords
As dopingAverage power
Degree of freedom
Dispersion management
Doping levels
Gain fibers
Grating compressors
High power fiber lasers
Last stage
Nonlinear effect
Nonlinearity management
Passively mode-locked
Peak power
Pulse energies
Pulse generation
Seed pulse
Seed source
Yb-fiber
Fiber lasers
Integrated optics
Passive mode locking
Pulse generators
Ultrashort pulses
Ytterbium
Fibers
Permalink
http://hdl.handle.net/11693/21385Published Version (Please cite this version)
http://dx.doi.org/10.1364/OL.37.003042Collections
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