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Dual Wavelength Waveplate

Dual wavelength waveplates are THG-PR polarization rotators and used to manage the polarizations of laser beams to obtain maximum conversion efficiency of third harmonic generations (THG), i.e., 1064 nm + 532 nm > 355 nm.

Generally, type I frequency-doubler (oo-> e) + type II frequency-tripler ( oe-> e) will be the best design for THG which needs no polarization rotator. However, when a type II KTP crystal is used as frequency-doubler and type II LBO as frequency-tripler (see the Figure), the laser polarizations coming out from KTP are not optimized for THG. How to change it into its optimum? TEMTO THG-PR polarization rotator can do it!

Common /2 wave phase retardation plate could only rotate the polarization of 532 nm to a specific angle. However, the linear polarization of 1064 nm will be distorted to be elliptical. The THG-PR rotator is specially designed to maintain the linear polarization of 1064 nm ( plate) and change simultaneously 532 nm (/2 plate) to the angle you need. The THG-PR can be applied to:


1. Type II (SHG) + Type II (THG)
2. Type I (SHG) + Type I (THG)
3. Type II (SHG) + Type I (THG)

Specifications:

Material

Crystal Quartz

Dimension Tolerance

+0.0/-0.2mm

Wavefront Distortion
/8 @632.8nm

Retardation Tolerance

/100 (typical)

Wavelength Range

240-2100nm

Parallelism

< 1 arc second

Surface Quality

20-10 S/D

Standard Wavelength 1064nm & 532nm

AR/AR Coating

R<0.2% @1064nm (fundamental wavelength)
R<0.5% @532nm (SHG wavelength)


Dual Wavelength Waveplates Standard Products:

(mm)

@1064nm & /2@532nm
/2@1064nm & @532nm

Part No.

Part No.

10.0
OWP4110
OWP4310
12.7
OWP4112
OWP4312
15.0
OWP4115
OWP4315
20.0
OWP4120
OWP4320
Note: Other wavelengths within the range of 200-2300nm are also available upon request. Metal Mount is available upon request.

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