Del Mar Ventures
4119 Twilight Ridge
San Diego, CA 92130
tel (858) 755-6727
fax (858) 755-6771
v/efax (858) 630-237
v/efax: (509) 752-0123
delmar@sciner.com
http://www.sciner.com/
http://www.femtosecondsystems.com/
Calcite is well known material for polarization optics. Due to structural anisotropy it
has two refractive indices. So it divides an entering beam of monochromatic light into two
beam having opposite polarization. This phenomenon is used to build polarization
components. As the difference in the two refractive indices is very large calcite has
become the most popular crystal in polarization applications.
We use natural Calcite minded from a few locations in Siberia, Russia. We differ calcite
into 3 basic grade.
| Grade “Unique” Calcite that meets this grade exhibits no striae and scatter when examined by He - Ne laser. This is the highest quality material that should be used to fabricate high power laser optics only. |
Grade “Extra” Material exhibits only light scatter and no striae when examined by He - Ne. Ligth scatter means one can see a few single centers of scatter or very weak laser beam track inside material. It is high quality material for fabrication of medium and high power laser optics. |
Grade “First” Exhibits scatter and only light striae when examined by He - Ne laser. This good quality material is widely used to fabricate calcite optics. Majority of ELAN's products in this brochure are manufactured from this grade. We also use it to fabricate low and medium power laser optics. Also calcite is classified to material of UV, VIS and IR quality depending on useful spectral range. |
| UV material Colorless material characterized by high transmission in UV range and widest useful spectral range (0.22 - 2.3 mm). |
VIS material Colorless or may have light yellow tint, transmits some amount of light in UV, for use at 0.35 - 2.3mm. |
IR material It normally has yellow color and therefore reduced transmission at visible wavelengths shorter than 550 nm. We recommend to use it for range 0.55 - 2.3mm. |
Note: to specify material one should indicate one of the basic grades and transmission
grade.
Examples: UV Extra, IR First.
Material propeties
| Chemical Formula Crystal Structure Density, g/cm3 Melting point, ° C Mohs Hardness Heat Capacity, cal / g K, at 20° C Thermal Expansion Coefficient, 10-6 K-1 Thermal conductivity, cal / cm S K Transmission Range, microns |
CaCO3 |
Refraction indices
| Wavelength 0,1318 0,1355 0,1411 0,1447 0,1467 0,1478 0,1487 0,1495 0,1513 0,1518 0,1536 0,1544 0,1558 0,1581 0,1596 0,1608 0,162 0,1633 0,1662 0,17 0,18 0,19 0,198 0,2 0,204 0,208 0,211 0,214 0,219 0,226 0,231 0,242 0,257 0,263 0,267 0,274 0,291 0,303 0,312 0,33 0,34 0,346 0,361 0,394 0,41 0,434 0,441 0,508 0,533 0,56 0,589 0,643 0,656 0,67 0,706 0,768 0,795 0,801 0,833 0,867 0,905 0,946 0,991 1,042 1,097 1,159 1,229 1,273 1,307 1,32 1,396 1,396 1,422 1,497 1,497 1,541 1,609 1,615 1,682 1,749 1,761 1,849 1,909 1,946 2,053 2,1 2,172 3,324 |
Ne 1,8 1,84 1,82 1,8 1,75 1,75 1,75 1,75 1,75 1,74 1,74 1,74 1,74 1,73 1,72 1,7 1,65 1,65 1,64 1,63 1,61 1,59 1,57796 1,57649 1,57081 1,5664 1,56327 1,55976 1,55496 1,54921 1,54541 1,53782 1,53005 1,52736 1,52547 1,52261 1,51705 1,51365 1,5114 1,50746 1,50562 1,5045 1,50224 1,4981 1,4964 1,4943 1,49373 1,48956 1,48841 1,48736 1,4864 1,4849 1,48459 1,48426 1,48353 1,48259 1,48215 1,48216 1,48176 1,48137 1,48098 1,4806 1,48022 1,47985 1,47948 1,4791 1,4787 - 1,47831 - 1,47789 - - 1,47744 - - - 1,47695 - 1,47638 - - 1,47573 - - 1,47492 - 1,47392 |
No 1,56 1,48 1,4 1,48 1,51 1,54 1,58 1,62 1,68 1,72 1,8 1,87 1,92 2,02 2,14 2,2 2,1 2 2 1,94 1,7 1,72 - 1,90284 1,88242 1,86733 1,85692 1,84558 1,83075 1,81309 1,80233 1,78111 1,76038 1,75343 1,74864 1,74139 1,72774 1,71959 1,71425 1,70515 1,70078 1,69833 1,69316 1,68374 1,68014 1,67552 1,67423 1,66527 1,66277 1,66046 1,65835 1,65504 1,65437 1,65367 1,65207 1,64974 1,64886 1,64869 1,64772 1,64676 1,64578 1,6448 1,6438 1,64276 1,64167 1,64051 1,63926 1,63849 1,63789 1,63767 1,63681 1,63637 1,6359 1,6349 1,63457 1,63381 1,63261 - 1,63127 - 1,62974 1,628 - 1,62602 1,62372 - 1,62099 - |
Calcite is well - known material for polarization optics. Due to structural anisotropy it has two refractive indices. So it divides an entering beam of monochromatic light into two beam having opposite polarization. This phenomenon is used to build polarization components. As the difference in the two refractive indices is very large calcite has become the most popular crystal in polarization applications.
Del Mar Ventures offers optical elements made of optical grade natural Calcite. Three different grades of natural Calcite are available depending on used optical range: UV grade - for 0.22 - 1.9 mm, colorless material, Visible - for 0.4 - 1.9 mm, colorless or light yellow colored material, and IR grade, yellow coloration is acceptable.
Within each grade material is classified to striation and scatter grades. Striation grades (A, B, C) are based on requirements close to MIL-G-174 B standard. Scatter grades (1, 2, 3) are based on the inspection of the material with 5 mW HeNe laser beam.
Typical products are: rectangular and round shaped plates, wedges, cubes.
| Orientation | to customer’s specs ± 20 arc. min. |
|---|---|
| Scratch/Dig | 60/40 (up to 20/10) |
| Flatness | l (up to l /4) |
| Parallelism | 3 arc.min (up to 10 arc. sec.) |
| Sizes | from 3 x 3 x 3 mm to 30 x 30 x 30 mm |
| AR coating are available on request. | |
| Chemical Formula | CaCO3 |
|---|---|
| Crystal Structure | Rhombohedral |
| Density, g/cm3 | 2.7 - 2.9 |
| Melting point, ° C | 1612 |
| Mohs Hardness | 3.0 |
| Heat Capacity, cal / g · K, at 20 ° C | 0.20 |
| Thermal Expansion Coefficient, 10-6 K-1 | a|| = 24.5 |
| a^= 5.7 | |
| Thermal conductivity, cal / cm · S · K | æ|| = 0.0090 |
| æ^= 0.0083 | |
| Transmission Range, microns | 0.24 - 1.90 |
| l, mm | 0.312 | 0.508 | 0.670 | 1.097 | 1. 497 |
|---|---|---|---|---|---|
| no | 1.714 | 1.665 | 1.654 | 1.642 | 1.635 |
| ne | 1.511 | 1.490 | 1.484 | 1.479 | 1.477 |
|
|
|
|
Copyright © 2004 [Del Mar Ventures]. All rights reserved.