Abstract
We report on an optical parametric amplification system which is pumped and seeded by fiber generated laser radiation. Due to its low broadening threshold, high spatial beam quality and high stability, the fiber based broad bandwidth signal generation is a promising alternative to white light generation in bulky glass or sapphire plates. We demonstrate a novel and successful signal engineering implemented in a setup for parametric amplification and subsequent recompression of resonant linear waves resulting from soliton fission in a highly nonlinear photonic crystal fiber. The applied pump source is a high repetition rate ytterbium-doped fiber chirped pulse amplification system. The presented approach results in the generation of ~50 fs pulses at MHz repetition rate. The potential of generating even shorter pulse duration and higher pulse energies will be discussed.
Highlights
Ultrashort and high peak power optical pulses have become extremely important in sources for numerous applications such as spectroscopy, detection or high field physics
We report on an optical parametric amplification system which is pumped and seeded by fiber generated laser radiation
We demonstrate a novel and successful signal engineering implemented in a setup for parametric amplification and subsequent recompression of resonant linear waves resulting from soliton fission in a highly nonlinear photonic crystal fiber
Summary
Ultrashort and high peak power optical pulses have become extremely important in sources for numerous applications such as spectroscopy, detection or high field physics. To alleviate the absence of such short and intense pulse sources we have chosen to generate a broad signal using highly nonlinear photonic crystal fibers (PCF) [6] Those fibers just need few nanojoules to deliver very stable supercontinua covering the interesting wavelengths for parametric amplifiers. For given input parameters, such a continuum exhibits a very interesting behavior dominated by a single resonant linear wave, which is identified as the precondition for a compressible continuum to ultra-short pulse duration This particular signal engineering for parametric amplification will be discussed in detail. Its implementation in a NOPA system has allowed the generation of 55 fs pulses at 1 MHz repetition rate, using a short pulse fiber laser as the pump source To our knowledge, this represents the first demonstration of amplification of resonant linear waves from soliton fission in a power scalable architecture. The potential of this approach to generate significantly shorter pulses is discussed as well
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