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          Etalons

Solid etalon used to tune a high power laserLightMachinery manufactures the world's finest solid and air spaced etalons. Our fluid jet polishing systems allow us to routinely create surfaces that are better than lambda/100 peak to valley.

Solid etalons, air spaced etalons, piezo tunable etalons, Gire Tournois etalons, LightMachinery has extensive expertise in the manufacturing and testing of all kinds of Fabry Perot etalons from 1mm square to 100mm in diameter.  These devices require high quality, very flat optical surfaces and extreme parallelism to achieve high performance, making them a good match for the polishing and metrology at LightMachinery.

Etalons can be made from a wide variety of materials including; Fused Silica, Silicon and even Air. Use our simple web based etalon calculator to determine the thickness and coating reflectivity to meet your requirements. 

Recent Etalon Projects
Etalon bull's eye ring pattern Nice Bull's eye ring pattern from a solid sandwich style etalon, This is the ring pattern formed from the large angles of light from a UV black light.
Etalon bull's eye ring pattern Zoomed in further to see the perfect rings
VIPA This is a VIPA, a virtually imaged phase array. The beam enters at a small angle through the anti-reflection coated stip along the left edge of this device then the beam bounces back and for between the high reflector next to the strip and the partial reflector on the other side.
Virtually imaged phase array The multiple reflections inside the VIPA can be seen in this device. We see the multiple reflections in the red part of the spectrum because the high reflector is designed for 532nm.
Silicon Etalon Spacer This is a large, 4" long x 2" dia, silicon spacer for an air spaced etalon (prior to attaching the mirrors). The inner bore has been lapped by hand and the exterior has been hand polished, the end faces are parallel, a vent hole is visible in the center.
VIPA Etalon Two small (~30mm diameter) air spaced etalons with lambda/200 rms air gap uniformity. The coatings look very transparent in the visible region, composite spacers were used to achieve a specific thermal tuning rate
VIPA Etalon A Virtually Imaged Phase Array, VIPA, etalon, the AR coated stripe on the left hand side allows the beam to enter the VIPA where is is trapped between two very parallel surfaces, one with a high reflector and the other with a 90% coating.
Two Perfect Fluid Jet Polished Solid Etalons 2" diameter solid etalons, uniform in thickness to better than lambda/100
Rings created by a MgF2 etalon Visible fringes prior to tuning a recently completed Magnesium Fluoride 3 piezo air spaced etalon designed for use in the UV
Long Silicon Etalons These are long solid silicon etalons, 25mm in diameter. The FSR of the etalons is 833MHz. The high index of the material creates a finesse of about 2 without any coatings. However the index also varies with temperature...
10 GHz Air spaced etalon A 10GHz air spaced etalon with 3 zerodur spacers optically contacted using epoxy free bonding. A very high finesse etalon with a 10mm clear aperture.
10 GHz Air spaced etalon This is a different view of the etalon shown above.
Diced Etalons A thin solid etalon 2mm x 4mm x 25 microns thick. Made from fused silica the thin etalon is surprisingly robust but a little tricky to package.
Diced Etalons Custom R&D Fabry Perot etalons, fresh off of the dicing machine. The etalons are about 1mm thick. The total block size is 2" x 2".
Air spaced etalon spacer This 1/2" air-spaced Fabry Perot etalon spacer is shown along side an interferometric view of the same spacer. The spacers need to be made to etalon tolerances since the spacer determines the separation and tilt between the two end plates.
Assembled small air spaced etalon The small air spaced Fabry Perot etalon has now been assembled with a 50um air gap. A small piece of kapton covers the vent hole in the side of the spacer. Mirrors are attached using epoxy free bonding (optically contacted)
Air spaced etalon next to a Canadian dime Shown here next to a Canadian dime. The mirror reflection from the etalon can be seen inside.
block of small piezo tunable fabry-perot etalons in production A block of piezo Fabry Perot etalons during the manufacturing process. Volume manufacturing techniques are utilized to achieve consistent high precision at a reasonable cost. Take a look at our online catalog of small piezo tunable etalons or call us to help configure a tunable etalon to meet your requirements
Large piezo tunable fabry-perot interferometer A very large 80mm aperture, piezo tunable Fabry Perot etalon with end plates matched to lambda / 110 (about 6nm) over the entire aperture. This was an extremely challenging and rewarding project. Three piezo stacks allow the end mirrors to be trimmed for perfect alignment, then the FSR can be tuned or scanned through 9um's of movement. Perfect
etalon design calculation and formulas Try our simple web based etalon calculator to determine the thickness and coating reflectivity to meet your requirements. (large file, may take a few seconds to load)
etalon design calculation and formulas

Several types of solid, air spaced and tunable etalons are available directly from our online catalog.

However do not hesitate to contact us to help specify your custom etalon

Large peizo tunable fabry perot etalon The instrument also has a 70nm raised step over half the aperture, creating an offset fringe pattern. The piezo tuning is very smooth despite the load of the inch thick ultra-flat plates.
Large piezo tunable fizeau interferometer A giant 60mm aperture piezo tunable Fizeau interferometer. End plates are matched to lambda/100 over the full aperture. This instrument uses the same method of 3 piezo stacks to allow the end mirror to be trimmed for perfect alignment and then the FSR can tuned or scanned through 9um's of movement.
piezo tunable fizeau interferometer A side view of the instrument sitting on a rotary stage for inspection. The bottom end plate is cemented to the hollow barrel, the top plate is connected to the 3 piezo elements. We are very proud of this tunable etalon.
solid etalons One Fabry Perot etalon is 3mm thick the other is 10mm thick, both have 80% reflectivity on each surface. These large etalons are used in an R&D lab.
Small piezo tunable air spaced etalon A tunable Fabry Perot etalon uses piezo electric cylinders to adjust the size of the air gap and sweep the peaks of the etalon. Take a look at our online catalog of small piezo tunable etalons or call us to help configure a tunable etalon to meet your requirements
air spaced micro-etalons Two different designs of micro-cavity air spaced etalons for 1550nm . Each etalon is about 3mm in size and more temperature insensitive than solid etalons. Bulk processing techniques allow these types of etalons to be manufactured in high volume at reasonable cost with epoxy free bonding (optical contacting)
matched confocal resonator This optic has a 1 meter radius and is matched to another identical optic to form a confocal resonator (a long air spaced etalon with curved mirrors).
etalon design calculation and formulas Try our simple web based etalon calculator to determine the thickness and coating reflectivity to meet your requirements.
etalon design calculation and formulas

Several types of solid, air spaced and tunable etalons are available directly from our online catalog.

However do not hesitate to contact us to help specify your custom etalon

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