Crystalline Quartz Waveplates
|Diameter tolerance||+0/-0.2 mm|
|Thickness tolerance||±0.2 mm|
|Surface quality||20-10 S-D|
|Transmitted wavefront distortion (TWD)||<λ/10 @ 632.8 nm|
|Retardation tolerance||λ/300 @ 20 °C|
|Parallelism error||<3 arcsec|
|Coatings||AR (R<0.2 %) on each surface|
|Laser induced damage threshold||>10 J/cm2 for 10 ns pulses @ 1064 nm|
|Mounting||Mounted in Ø25.4x6 mm black anodized metal mount|
Half (λ/2) Waveplate. A linearly polarized beam incident on a half wave crystal quartz waveplate emerges as a linearly polarized beam but rotated such that its angle to the optical axis is twice that of the incident beam. Therefore, half-waveplates can be used as continuously adjustable polarization rotators. Half-waveplates are used to rotate the plane of polarization, electro-optic modulation and as a variable ratio beamsplitter when used in conjunction with a polarization cube.
Quarter (λ/4) Waveplate - thin-film compensator. If the angle between the electric field vector of the incident linearly polarized beam and the retarder principal plane of the quarter-waveplate is 45, the emergent beam is circularly polarized. When a quarter waveplate is double passed, i.e. by mirror reflection, it acts as a half waveplates and rotates the plane of polarization to a certain angle. Quarter waveplate are used in creating circular polarization from linear or linear polarization from circular, ellipsometry, optical pumping, suppressing unwanted reflection and optical isolation.
Zero Order waveplates are generally preferred since they are least sensitive to variations in wavelength, angle of incidence and temperature.
Standard waveplates are based on air-spaced construction which allows to use the waveplate for high power applications. The damage threshold is more than 20 J/cm² for 10 ns pulses @ 1064 nm
To suit specific applications waveplates can employ, glued and optically contacted contruction Zero Order compensated design which is available on request.
|Waveplates are made from excellent quality laser grade Crystalline Quartz material|
Crystalline quartz waveplates graph calculator
|2-CPW-LO-L/2-1030||0deg||24.85 J/cm2 @1064nm; 10ns; 100 Hz|
|2-CPW-ZO-L/2-1030||0deg||24.12 J/cm2 @1064nm; 10ns; 100 Hz|
|2-CPW-ZO-L/2-0266||0deg||2.65 J/cm2 @266nm; 5ns; 100 Hz|
|2-CPW-ZO-L/2-0343||0deg||14.73 J/cm2 @355nm; 6ns; 100 Hz|
|2-CPW-ZO-L/2-0532||0deg||28.49 J/cm2 @532nm; 7ns; 100 Hz|
|2-CPW-ZO-L/2-0800||0deg||0.122 J/cm2 @800nm; 52fs; 1000 Hz|
|2-CPW-ZO-L/2-1030||0deg||0.59 J/cm2 @1030nm; 320fs; 50 kHz|
Laser induced damage threshold (LIDT) measurements are performed on actual components produced by Altechna. Individual component’s LIDT depends on multiple parameters (substrate material, polishing batch, coating batch, storage conditions, etc). Damage threshold value reached for above individual components should be used for reference only but it is not guaranteed for all optics. Altechna can perform coating damage threshold testing service upon request.
Altechna offers a wide range of high performance optical coatings on standard, custom or customer supplied optics.
Our coatings cover wavelength range from deep UV (193 nm) to far IR (25 µm) with biggest part of coatings done in wavelength ranges of most conventionally accessible laser and illumination sources from 266 nm to 2 µm.
We offer a set of standard and custom coatings per individual request:
- Anti-reflection coatings
- High reflection coatings
- Beam splitter coatings
- Partially reflective coatings
- Polarizer coatings
- Filter coatings
- Ultrafast GDD compensated coatings
- Gires-Tournois interferometer mirrors (GTI)
- Variable reflectivity mirrors
- Metallic coatings
At Altechna we aim to provide high damage threshold, high quality coatings for constantly growing photonics market with highest standards.
Each coating is special and over the years in the photonics field we have learned that flexibility is the key to meet high demands of our customers therefore our coatings are done using different technologies which are chosen for separate coatings individually. Here is our list of coating technologies available at Altechna:
- Electron beam evaporation
- Ion assisted deposition
- Ion beam sputtering
- Magnetron sputtering
Each technology is different and is used according to requirements of spectral sensitivity, damage threshold, hardness, surface quality etc.
|Deposition Rate||>10 Å/sec||~10 Å/sec||~3 Å/sec||1-6 Å/sec|
|Coating area per run||3000 cm2||3000 cm2||500 cm2||2000 cm2|
|Temperature Range During Coating||200 - 300°C||20 - 100°C||20 - 150°C||20-100°C|
|Number of Layers||1-50||~50||200||Up to 200|
|Density / Porosity||Porous||Dense||Near bulk||Near bulk|
|Adhesion / Durability||Low||Good||Excellent||Excellent|
|Humidity Sensitivity||Yes||Yes, small||No||No|
|Aging Effects||Yes||Yes, small||No||No|
|Intrinsic Stress||< 100MPa||~ 100MPa||Few 100MPa||Few 100 MPa|
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