Laser probe tip assembly
View Patent ↗In a method of assembling a laser probe tip, an optical fiber comprising an optical fiber core and silica glass cladding surrounding the core is provided. A fiber cap formed of silica glass is also provided. Silicone oil is applied to a surface of the cladding at a distal end of the optical fiber or an interior surface of the fiber cap. The distal end of the optical fiber is inserted into the interior cavity of the fiber cap. The silicone oil is then converted into silica glass, which bonds the fiber cap to the optical fiber.
1. A method comprising:
providing an optical fiber comprising a core and silica glass cladding surrounding the core;
providing a fiber cap formed of silica glass, the fiber cap comprising a cap body having an interior cavity and an opening to the internal cavity at a proximal end;
applying silicone oil to at least one of a surface of the cladding at a distal end of the optical fiber and an interior surface of the fiber cap, the silicone oil comprising a component selected from the group consisting of an organosilicone, an organosilicone compound, and a silicone polymer;
inserting the distal end of the optical fiber through the opening and into the interior cavity of the fiber cap, wherein the silicone oil engages both the cladding and the fiber cap;
converting the silicone oil into silica glass comprising applying ultraviolet (UV) radiation to the silicone oil in an atmosphere containing an oxidizing agent; and
bonding the fiber cap to the optical fiber responsive to converting the silicone oil into silica glass.
2. The method of claim 1 , further comprising providing the oxidizing agent, the oxidizing agent comprising a component selected from the group consisting of oxygen gas, peroxide, and ozone gas.
3. The method of claim 2 , wherein providing the oxidizing agent comprising providing a flow of the oxidizing agent adjacent the silicone oil during converting silicone oil into silica glass.
4. The method of claim 3 , wherein providing a flow of the oxidizing agent gas adjacent the silicone oil comprises directing the flow of the oxidizing agent into the interior cavity of the fiber cap.
5. The method of claim 1 , wherein:
the cladding at the distal end of the optical fiber comprises a transmitting surface, through which electromagnetic energy delivered through the core is discharged; and
the silicone oil covers a portion of the transmitting surface following inserting the distal end of the optical fiber through the opening and into the interior cavity of the cap.
6. The method of claim 5 , wherein:
the distal end of the optical fiber comprises a beveled optical surface; and
the method further comprises:
delivering electromagnetic energy through the core;
reflecting the energy off the beveled optical surface; and
discharging the energy through the transmitting surface of the cladding, the converted silicone oil, and the fiber cap.
7. The method of claim 1 , wherein:
the fiber cap includes an opening at a distal end to the interior cavity; and
the method comprises closing the open distal end following bonding the fiber cap to the optical fiber.
8. The method of claim 1 , wherein applying UV radiation comprises applying UV radiation having a wavelength of less than 250 nanometers.
9. The method of claim 1 , wherein applying UV radiation comprises applying an x-ray, electron beam radiation.