US 11,721,946 B2
Optical system element, for receiving a pressurised functional fluid
Lionel Lacampagne, Gujan-Mestras (FR); Christian Chappuis, Andernos-les-Bains (FR); Jerome Neauport, Bordeaux (FR); and Sebastien Vermersch, La Teste-de-Buch (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Appl. No. 16/966,952
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
PCT Filed Feb. 4, 2019, PCT No. PCT/FR2019/050237
§ 371(c)(1), (2) Date Aug. 3, 2020,
PCT Pub. No. WO2019/150057, PCT Pub. Date Aug. 8, 2019.
Claims priority of application No. 18 50946 (FR), filed on Feb. 5, 2018.
Prior Publication US 2021/0036478 A1, Feb. 4, 2021
Int. Cl. H01S 3/04 (2006.01); H01S 3/02 (2006.01); H01S 3/042 (2006.01); H01S 3/06 (2006.01); H01S 3/213 (2006.01); H01S 3/23 (2006.01); H01S 3/094 (2006.01); H01S 3/091 (2006.01)
CPC H01S 3/0407 (2013.01) [H01S 3/022 (2013.01); H01S 3/027 (2013.01); H01S 3/0401 (2013.01); H01S 3/042 (2013.01); H01S 3/0404 (2013.01); H01S 3/0602 (2013.01); H01S 3/213 (2013.01); H01S 3/2316 (2013.01); H01S 3/091 (2013.01); H01S 3/094 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An element of an optical system including:
a first enclosure for receiving in circulation a functional fluid; and
at least one inlet and/or outlet window fixedly located on the first enclosure, and configured to allow a light beam to pass into and/or out of the first enclosure;
wherein:
the inlet and/or outlet window includes two viewports which laterally delimit a spacer cavity adjacent to the first enclosure, said spacer cavity is configured for receiving a second fluid, having a predetermined optical index, and is provided with a pressure adjusting device therewithin,
the second fluid has an optical index substantially equal to that of one of the functional fluid and an ambient medium surrounding said element, within plus or minus 10%, and
the pressure adjusting device is adapted for the pressure within the spacer cavity to be substantially equal to a pressure of the other of the functional fluid in the first enclosure and the ambient medium, within plus or minus 10%.