An Optical Parametric Oscillator (OPO) transforms a pump laser wave with the frequency ωp into two different waves, called idler and signal, where signal is the one with the higher frequency. The sum of their frequencies (ωi and ωs) is equal to the frequency of the pump laser: ωp = ωi + ωs
Basically an OPO is a nonlinear crystal working inside an optical resonator where either the idler wave or the signal wave resonates. By modifying phasematching properties like the orientation or the temperature of the crystal you can change the frequency of the output. Another option is to modify its quasi-phasematching period through a periodical poling.
A variation in the optical path length of the resonator can be used for additional finetuning. With an OPO it is possible to achieve wavelengths beyond those of available laser mediums.
An OPO system uses several different coating types. In the following you can find the diagram for different OPOs. To minimize the losses in intensity every untitled surface has to be coated with a corresponding AR.
Of course there are other possible setups for the featured systems, especially when working with 45°-filters and optimized polarization for the pump, signal and idler wave.
more information regarding OPO coatings with optimized GDD
All values are given for standard coatings. Customized coatings available for all types.
Coating methods available:
1064 nm: R < 8%; 1480-1650 nm: Ravg > 99.7%;
3000-3800 nm: Ravg < 20%
410-710 nm: Rs,avg > 99%; 710-2650 nm: Rp, avg < 2%
Every coating type can be optimized
• substrate material
• reflection / transmis-
• angle of incidence
• GDD value
Alternatively we can create
a totally new design for you.