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Optical parametric chirped pulse amplification and spectral shaping of a continuum generated in a photonic band gap fiber

E. Hugonnot, M. Somekh, D. Villate, F. Salin, and E. Freysz

Open Access Open Access

Abstract

A chirped pulse, spectrally broadened in a photonic bandgap optical fiber by 120 fs Ti:Sapphire laser pulses, is parametrically amplified in a BBO crystal pumped by a frequency doubled nanosecond Nd:YAG laser pulse. Without changing the frequency of the Ti:Sapphire, a spectral tunability of the amplified pulses is demonstrated. The possibility to achieve broader spectral range amplification is confirmed for a non-collinear pump-signal interaction geometry. For optimal non-collinear interaction geometry, the pulse duration of the original and amplified pulse are similar. Finally, we demonstrate that the combination of two BBO crystals makes it possible to spectrally shape the amplified pulses.

©2004 Optical Society of America

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Figures (8)
Fig. 1.
Fig. 1. Phase-matching k-vector triangle for non-collinear optical parametric amplification.

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Fig. 2.
Fig. 2. Theoretical spectral gain (a) and experimental spectra of amplified pulses (b) for different phase matching angles in a collinear geometry

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Fig. 3.
Fig. 3. Theoretical spectral gain (a) and experimental spectra of amplified pulses (b) for two different non collinear angles. The phase-matching angle is set to obtain a spectral gain centered at 810 nm.

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Fig. 4.
Fig. 4. Experimental set-up.

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Fig. 5.
Fig. 5. Internal phase matching angle (a) and FWHM spectral width (b) of amplified pulses versus wavelength for collinear geometry.

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Fig. 6.
Fig. 6. FWHM spectral bandwidth versus non-collinear angle (a) and non-collinear angle versus phase matching angle (b) for an amplified pulse centered at 810 nm.

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Fig. 7.
Fig. 7. Measured autocorrelations of the recompressed and amplified signal in collinear (solid line) and non collinear (dotted line) geometry.

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Fig. 8.
Fig. 8. Spectral shaping of amplified pulses in a two BBO OPCPA.

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Equations (5)

Equations on this page are rendered with MathJax. Learn more.

1 ⁄ λ i = 1 ⁄ λ p − 1 ⁄ λ s
Δ k → = k → p − k → s − k → i = 0 →
G = I s ( L ) ⁄ I s ( 0 ) = 1 + ( Γ ⁄ g ) 2 sinh 2 g L
n s = n s o , n i = n i o and n p − 2 − n p o − 2 = ( n p e − 2 − n p o − 2 ) sin 2 θ ,
( n i 0 λ i 0 ) 2 = ( n p λ p ) 2 + ( n s λ s ) 2 − 2 cos ⁡ α ( n s n p λ s λ p )
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