Polarizing Optics - 2

Fuzhou DELICATE Optical Inc. Is a professional customized crystal & optics manufacturer in China. We provide laser crystals made from YAG series, with different doped concentration, KTP, BBO & optical components from sapphire, optical glasses, fused silica, quartz, and Glan etc.

Products sizes and T/R coatings are available upon requests.

Achromatic waveplate is made from two different substrate materials such as crystal quartz and magnesium fluoride. For the single material waveplates the working wavelength is very limited because of the dispersion of the material. While Achromatic Waveplate use two different kinds of material, the dispersions of the birefringence are also different. Hence such waveplate is not sensitive to the wavelength change. DELICATE design Achromatic Zero-Order Quartz-MgF2 waveplates with working wavelength range larger than 300nm and retardation better than l/50 for l/2 waveplate and better than l/100 for l/4 waveplate.

Main advantages:
Extremely broad wavelength ranges
High damage threshold for Air-spaced Achromatic waveplate
Low sensitivity within the designed wavelength
Retardation tolerance up to ± L/100 over the wavelength range

Main applications:
Laser systems
Spectrophotometry
Optical communication devices
DVD, CD, Polarization digital cameras

Main properties:
Material: Crystal Quartz and MgF2
Dimension Tolerance: +0.0, -0.2 mm
Retardation Tolerance: Better than λ /50 for λ /2 achromatic waveplate
Better than λ /100 for λ /4 achromatic waveplate
Wavelength Range: Standard wavelength
Parallelism: Up to 10 arc second
Surface Quality: 20-10 scratch and dig
Standard Wavelength Ranges
VIS: 460nm_620nm
NIR: 700nm--1000nm
IR: 1200nm_1650nm
DELICATE can offer two kinds of achromatic waveplate:
Airspaced and Cemented
Notes: Achromatic waveplate is sensitivity to the temperature change.
Other waveplate with different wavelength range(between 400-2100nm) are also available upon request, please contact DELICATE for more information.

Polarization Rotator

Material: Crystal Quartz
Dimension Tolerance: +0.0, -0.1mm
Wavefront Distortion: <λ /8@632.8 nm
Wavelength Range: 440-1600nm
Retardation Accuracy: <5 arc minutes
Surface Quality: 20/10 scratches & dig
Clear Aperture: >90%
AR Coating: R<0.2% at central wavelength
Rotation Orientation: Clockwise (right-handed, standard)

Mounts and holders for waveplates

Material and finished: Black anodized aluminum
Outside Diameter(D) Tolerance: ± 0.1mm
Thickness(t) Tolerance: ± 0.1mm
Waveplate Diameter(f) Tolerance: +0.15, -0.0mm

Dual Wavelength Waveplates
Dual wavelength waveplate is widely used on Third Harmoni Generation (THG) system. When you need a NLO crystal for type II SHG (o+e— >e), and a NLO crystal for type II THG (o+e— >e), the out put polarization from SHG can not be used for THG. So you must turn the polarization to get two perpendicular polarization for type II THG. Dual wavelength waveplate works like a polarizing rotator, it can rotate the polarization of one beam and remain another beam's polarization. Also the dual wavelength waveplate can be applied to following systems:

1. Type II SHG + Type II THG
2. Type II SHG + Type I THG
3. Type I SHG + Type I THG
For example: We use KTP as SHG type II and LBO as THG type II, but the polarization of output beam from KTP is not optimized for THG type II. When we use a dual wavelength waveplate as drawing, it can change the 532nm beam to a special angle polarization but not change 1064nm beam at all.

Specifications:
Material: Crystal Quartz
Diameter Tolerance: +0.0, -0.2mm
Wavefront Distortion: <λ /8@633 nm
Retardation Tolerance: <λ /100
Parallelism: <3"
Surface Quality: 20/10 Scratch and dig
Dual Wavelength AR Coating: R<0.2% at fundamental wavelength;
R<0.5% at SHG wavelength