Abstract
Non-collinear optical parametric amplification in potassium-titanyl phosphate (KTP) pumped with 800 nm pulses is reported. Broadband phase matching is achieved with non-collinear geometry and a slightly divergent signal seed. This enables a gain bandwidth up to approximately 2500 cm(-1) in near-IR region. Introducing a chirp into the pump pulse makes it possible to amplify the white light seed in a broad spectral region from approximately 1050 to approximately 1400 nm simultaneously. Pulse compression to sub-40 fs is readily achieved, while the spectrum should support approximately 8.5 fs pulses. Angular dispersion of the broadband output is discussed.
Highlights
For applications such as broadband vibrational spectroscopic studies and two-dimensional IR-spectroscopy, the generation of broadband ultrashort pulses in near- and mid-IR regions of the spectrum is highly desirable [1,2,3]
Between long- and short-wavelength components of a broadband Ti-sapphire laser output to generate a seed that subsequently underwent broadband two-stage amplification in periodically poled LiNbO3 and LiTaO3 crystals [5]; broadband amplification of difference-frequency mixing (DFM)-generated seed in two BBO-OPA stages at the degeneracy point [6, 8, 9]; self-phase modulation of intense ~55-fs pulses centered at 2.0 μm in a xenon filament [7]
Non-collinear optical parametric wave-mixing is a promising approach for the generation of ultra-broadband radiation in the near- and mid-IR, being able to provide bandwidths of ~200-250 cm-1 [11, 12] or even >2100 cm-1 [13]
Summary
For applications such as broadband vibrational spectroscopic studies and two-dimensional IR-spectroscopy, the generation of broadband ultrashort pulses in near- and mid-IR regions of the spectrum is highly desirable [1,2,3]. Several papers reported different methods for the generation of intense few-cycle pulses at wavelengths ~1.5 – 2.4 μm [5,6,7,8,9]. We report the broadband amplification of short pulses with greater than 2500 cm-1 of bandwidth in the near-IR (~1050-1450 nm) by using type-II NOPA of white light pumped at 800 nm in a potassium titanyl phosphate (KTP) crystal, a nonlinear optical material which has not been previously identified for ultra-broadband generation in the IR. Possibility to compensate for the white-light chirp by properly stretching the pump pulses and amplifying the whole phase-matched bandwidth at once
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