Organic Nonlinear Optical Crystal AANP

|Feature|Specification|

Large-capacity optical communications require techniques that measure high-speed optical signals and optical switching techniques. Such techniques use second-order nonlinear optical crystals as wavelength conversion crystals because of their fast response. The organic nonlinear optical crystal AANP has a higher wavelength-conversion efficiency than conventional inorganic crystal. It is expected that AANP will have many applications.

Feature

Advantages

Large Nonlinear Optical Coefficients (d₃₁=d₁₅= 80 pm/V) (*1)
AANP has high wavelength-conversion efficiency. AANP has about thirty times higher SHG efficiency than KTP at the fundamental wavelength of 1.55 µm.
AANP is an effective wavelength-conversion crystal for ultrashort pulse lasers and wavelength-tunable lasers.
SHG Phase-matchable Wavelength Range from 1.0 to 1.6 µm
AANP is suitable for SHG or SFG in the 1.3 to 1.6 µm optical communication wavelength region.
Type-II Phase Matching
When a type-II phase-matching crystal is used for SFG, only SFG light can be obtained. (If type-I crystal is used, both SFG light and SHG light can be obtained.) AANP is suitable for optical sampling oscilloscopes using SFG crystal because the signal-to-noise ratio is not decreased by SHG.

Organic nonlinear optical crystal AANP

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Specification

Melting point	167 °C (*1)
Deliquescence	no
Size	7 mm × 7 mm × 1 ~ 5 mm (Clear aperture < 2 mm diamete)
Transparent range	500 ~ 1600 nm (*2)
Absorption coefficient	8 %/mm (at 1.55 µm)
Refractive indices	wave length :0.66 µm	n_a:1.70, n_b:1.67, n_c:1.83
	wave length :0.78 µm	n_a:1.68, n_b:1.65, n_c:1.79
	wave length :1.32 µm	n_a:1.64, n_b:1.64, n_c:1.74
	wave length :1.55 µm	n_a:1.64, n_b:1.64, n_c:1.74
NLO coefficients	d₃₁ = d₁₅ = 80 ,d₃₃ = 60 pm/V (*1)
Phase-matchable range	1000 ~ 1600 nm (*2) (fundamental wavelength)
Phase match	Type-II
Phase-matching method	Angle tilting

Applications

SHG, SFG, DFG, OPG etc.
Optical Sampling Oscilloscopes (*3) Auto Correlators, Second Harmonic Generators etc.

References

*1): S.Tomaru et al.,Appl.Phys.Lett.58,2583(1991).
*2): A.Yokoo et al.,J.Opt.Soc.Am.B/Vol.15,432(1998).
*3): H.Takara et al.,Tech.Dig.ECOC E6,ThB.1.2(1996).

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