wavelengths
 

OPO coatings

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

Example of an IR-OPO set-up
Two examples of an OPO set-up
Example of an BBO-OPO set-up

All values are given for standard coatings. Customized coatings available for all types.

Coating methods available:

EBEIADIPMSIBS
HT 1064 HR 1480-1650 HT 3000-3800 nm /0° CaF₂
[B-05749]HT 1064 HR 1480-1650 HT 3000-3800 nm /0° CaF₂

1064 nm: R < 8%; 1480-1650 nm: Ravg > 99.7%;
3000-3800 nm: Ravg < 20%

HR 1064 nm HT 1300-1800 nm /45°
[B-01392]HR 1064 nm HT 1300-1800 nm /45°

1064 nm: R > 99.6%; 1300-1800 nm: R < 10%

HR 410-700 nm HT 725-2600 nm /0°
[B-03084]HR 410-700 nm HT 725-2600 nm /0°

410-700 nm: Ravg > 99%; 725-2600 nm: Ravg < 10%

HR 410-710 nm/s HT 710-2650 nm /p /45°
[B-05259]HR 410-710 nm/s HT 710-2650 nm /p /45°

410-710 nm: Rs,avg > 99%; 710-2650 nm: Rp, avg < 2%
(IAD-coating)

HR 355 nm HT 400-700 nm /45°
[B-11634]HR 355 nm HT 400-700 nm /45°

355 nm: R > 99.5%; 400-700 nm: Ravg < 4% (IBS-coating)

AR 355 nm + 400-700 nm /0°
[B-03316]AR 355 nm + 400-700 nm /0°

355 nm: R < 1%; 400-700 nm: Ravg < 1.2%