Abstract
In this letter, we show the broadband sum-frequency generation (SFG) in the Green-Yellow-Orange-Red spectral range using bismuth triborate, BiB3O6 crystal (BIBO) as a nonlinear material. We perform a noncollinear phase-matching configuration within the BIBO crystal using the remaining light behind the second harmonic generation stage and the infrared idler of an optical parametric amplifier (OPA). The obtained mixing radiation of ultrafast light sources to generate femtosecond pulses across the 520.5 to 742.5 nm region is observed. The SFG spectrum from a single-pass cross-correlation intensity over such visible range is shown. The SFG wavelengths as a function of the tunable wavelength idler OPA agree with the expectations of the parametric conversion condition and open the door to practical multi-beam or multi-color sum-frequency generators.
Highlights
The growing field of ultrafast light sources still requires multi-beam or multi-color systems motivated by scientific, medical, and industrial applications [1,2,3,4]
Multi-beam and access to the new spectral region of femtosecond pulses are possible with parametric frequency conversion, ergo ultrafast optical parametric oscillator (OPO) [11], intracavity sum-frequency generation (SFG) of pump and signal in a synchronously pumped femtosecond tunable OPO [12], optical parametric amplifiers (OPA) [13], second and third harmonic generators [14,15,16] or, as we show here, sum-frequency generators
A nonlinear optical material such as bismuth triborate, BiB3 O6 (BIBO) has shown exceptional nonlinear coefficients for wavelength generation between 290 and more than 2500 nm [18]. Such a BIBO crystal has demonstrated the efficient tunable parametric generation of femtosecond pulses compared with other birefringent materials [19,20]
Summary
The growing field of ultrafast light sources still requires multi-beam or multi-color systems motivated by scientific, medical, and industrial applications [1,2,3,4]. The progress of birefringent crystals as nonlinear material enables frequency conversion for the light generation in the new spectral region [17]. A nonlinear optical material such as bismuth triborate, BiB3 O6 (BIBO) has shown exceptional nonlinear coefficients (deff = 3.2 pm/V) for wavelength generation between 290 and more than 2500 nm [18]. Such a BIBO crystal has demonstrated the efficient tunable parametric generation of femtosecond pulses compared with other birefringent materials [19,20]. With a single BIBO crystal, the femtosecond optical parametric oscillator covers a visible range across 480–710 nm at room temperature operation [21]
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