PPLN for Difference Frequency Generation

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Difference Frequency Generation, DFG, can be used to generate wavelengths in the 2-5µm range by mixing two shorter wavelengths in a suitable PPLN crystal. Stratophase’s standard DFG crystals are designed to produce light at the difference between the frequencies of a fixed frequency Nd:YAG laser and a tuneable Ti Sappire, or similar lasers. The output wavelength is selected by tuning the input laser, selecting the correct grating in the PPLN crystal and varing the PPLN temperature.

Features

AR Coated; Input facet approximately <1%R @ Pump wavelengths, Output facet approximately <2% @ generated wavelengths
Multiple Gratings; Maximum Flexibility, tuning possible via temperature, grating or pump wavelength selection
High efficiency generation of 2-5µm
These crystals are available in other lengths and with different coatings as semi-standard products
Crystals for other wavelengths are available as semi-standard or custom products.

Item No	Pumps (nm)	Output (nm)	Poled Periods (um)	Temperature Range (⁰C)	Crystal Length (mm)	Grating Aperture (mm)
DFG1-20	742-796 & 1064	2440- 3170	18.00, 18.25, 18.50, 18.75, 19.00, 19.25, 19.50, 19.75, 20.00, 20.25, 20.50, 20.75, 21.00	160-200	20	0.5x0.5
DFG1-40					40
DFG2-20	775-869 & 1064	2850- 4740	20.00, 20.25, 20.50, 20.75, 21.00, 21.25, 21.75, 22.00, 22.25, 22.50, 22.75, 23.00	160-200	20	0.5x0.5