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Ultra-broad bandwidth parametric amplification at degeneracy

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Abstract

We report on a novel approach of ultra-broad bandwidth parametric amplification around degeneracy. A bandwidth of up to 400-nm centered around 800 nm is amplified in a BBO crystal by using chirped pump pulses with a bandwitdth as broad as 10 nm. A supercontinuum signal is generated in a microstructured fiber, having to first order a quadratic chirp, which is necessary to ensure temporal overlap of the interacting waves over this broad bandwidth. Furthermore, we discuss the potential of this approach for an octave-spanning parametric amplification.

©2005 Optical Society of America

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Ultra-wide parametric amplification at 800 nm toward octave spanning

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Opt. Express 17(7) 5153-5162 (2009)

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Figures (11)

Fig. 1.
Fig. 1. The “magic” phase-matching condition. Calculated phase-matching curve of a Type 1 BBO crystal pumped by 400 nm light at a pump tilt angle of 3.7°.
Fig. 2.
Fig. 2. (a) Calculated phase-matching curves around degeneracy in a type 1 BBO crystal pumped by 410 nm light (black) or a broadband pump around 405 nm (red) in 2 nm increments.
Fig. 2.
Fig. 2. (b) Phase-matching map for a broadband pump in a BBO crystal, for type 1 process.
Fig. 3.
Fig. 3. Experimental setup of the ultra-broadband parametric amplification system. BS: beam sampler, HWP: half-wave plate, PBS: polarization beam splitter, PCF: photonic crystal fiber, BD: beam dump, FSP: fused silica prism.
Fig. 4.
Fig. 4. Continuum created in a 20 cm long photonic crystal fiber with zero-dispersion at 800 nm.
Fig. 5.
Fig. 5. Frequency doubled spectrum as a function of type 1 BBO crystal thickness.
Fig. 6.
Fig. 6. Spectrogram of supercontinuum generated in a 20 cm long photonic crystal fiber with a zero-dispersion wavelength at 810 nm. The dashed lines represent phase-matching conditions for certain pump wavelengths according to figure 2.
Fig. 7.
Fig. 7. Measured amplified spectra at two different delay positions in the case of a 20 cm long photonic crystal fiber and a pump duration of 500 fs.
Fig. 8.
Fig. 8. Spectrogram of supercontinuum generated in a 5 cm long photonic crystal fiber with a zero-dispersion wavelength at 810 nm. The dashed lines represent phase-matching conditions for certain pump wavelengths according to figure 2.
Fig. 9.
Fig. 9. Measured 400 nm broad phase-matched parametrically amplified spectrum, photonic crystal fiber length 5 cm and a pump duration of 500 fs.
Fig. 10.
Fig. 10. Phase-matching curves with added angular dispersion in order to obtain an octave spanning parametric amplification bandwidth.
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