Laser emitter modules and methods of assembly
Embodiments are directed to laser emitter modules and methods and devices for making the modules. Some module embodiments are configured to provide hermetically sealed enclosures that are convenient and cost effective to assemble and provide for active alignment of optical elements of the module.
1. A ferrule assembly for positioning an input surface of an optical fiber, comprising:
an outer sleeve including a barrel portion with an inner bore extending along an axial length of the barrel portion and a flange member extending radially from the barrel portion, the flange member including a distal facing front surface;
a fiber attachment sleeve which is secured to the outer sleeve and which includes an outer surface sized to slide axially within the inner bore of the outer sleeve, an axial fiber receiving lumen disposed concentrically with the outer surface and an input end; and
an optical fiber secured to the fiber attachment sleeve with an input end of the optical fiber being disposed distally beyond the input end of the fiber attachment sleeve and disposed within the inner bore of the outer sleeve.
2. The ferrule assembly of claim 1 wherein the input end of the optical fiber is substantially axially coextensive with the distal facing front surface of the flange member.
3. A ferrule assembly for positioning an input surface of an optical fiber, comprising:
an outer sleeve including a barrel portion with an inner bore extending along an axial length of the barrel portion and a flange member extending radially from the barrel portion, the flange member including a distal facing front surface;
a fiber attachment sleeve which is secured to the outer sleeve and which includes an outer surface sized to slide axially within the inner bore of the outer sleeve, the fiber attachment sleeve including a stepped axial lumen which is concentric with an outer surface of the fiber attachment sleeve and which includes a minor transverse dimension portion of the stepped axial lumen which extends extending proximally from an input end of the fiber attachment sleeve and a major transverse dimension portion of the stepped axial lumen disposed proximally of the minor transverse dimension portion, the minor transverse dimension portion having a transverse dimension which is stepped down relative to a transverse dimension of the major transverse dimension portion; and
an optical fiber which is secured within the stepped axial lumen of the fiber attachment sleeve with an input end of the optical fiber being disposed distally beyond the input end of the fiber attachment sleeve and being disposed within the inner bore of the outer sleeve.
4. The ferrule assembly of claim 3 wherein the input end of the optical fiber is disposed substantially axially coextensive with the distal facing front surface of the flange member of the outer sleeve.
5. The ferrule assembly of claim 3 wherein the optical fiber is secured to the fiber attachment sleeve by a soft solder disposed in the major transverse dimension portion of the stepped axial lumen of the fiber attachment sleeve between an outer surface of the optical fiber and an inner surface of the stepped axial lumen and a hard solder disposed within the minor transverse dimension portion of the stepped axial lumen of the fiber attachment sleeve between an outer surface of the optical fiber and an inner surface of the stepped axial lumen.
6. The ferrule assembly of claim 5 wherein the soft solder comprises indium silver solder.
7. The ferrule assembly of claim 5 wherein the hard solder comprises gold tin solder.
8. The ferrule assembly of claim 3 wherein the minor transverse dimension portion of the stepped axial lumen of the fiber attachment sleeve has a transverse dimension of about 125 microns to about 700 microns.
9. The ferrule assembly of claim 3 wherein the major transverse dimension portion of the stepped axial lumen of the fiber attachment sleeve has a transverse dimension of about 500 microns to about 1500 microns.
10. The ferrule assembly of claim 3 wherein an outer surface of the optical fiber further comprises a metallic layer disposed over an axial portion of the optical fiber within the fiber attachment sleeve.
11. The ferrule assembly of claim 10 wherein the outer surface of the optical fiber comprises no metallic layer on a portion of the optical fiber that extends distally from the input end of the fiber attachment sleeve.
12. The ferrule assembly of claim 3 wherein the fiber attachment sleeve has an axial length of about 5 mm to about 15 mm.
13. The ferrule assembly of claim 3 wherein a front input surface of the input end of the fiber attachment sleeve comprises gold plating.
14. The ferrule assembly of claim 1 wherein an outer surface of the fiber attachment sleeve is secured to a proximal portion of the outer sleeve by a seam weld.
15. The ferrule assembly of claim 14 wherein the seam weld between the outer surface of the fiber attachment sleeve and proximal portion of the outer sleeve extends around the entire circumference of an outer surface of the fiber attachment sleeve to produce a hermetic seal between the outer sleeve and the fiber attachment sleeve.
16. The ferrule assembly of claim 1 wherein an outer surface of a jacketed portion of the optical fiber disposed proximally of the input end of the optical fiber is secured to an inside surface of the cylindrical fiber attachment sleeve with adhesive.
17. The ferrule assembly of claim 1 wherein the fiber attachment sleeve comprises a cylindrical fiber attachment sleeve.
18. The ferrule assembly of claim 3 wherein the fiber attachment sleeve comprises a cylindrical fiber attachment sleeve.
19. The ferrule assembly of claim 5 wherein a hermetic seal is formed between an outer surface of the optical fiber and the fiber attachment sleeve.
20. The ferrule assembly of claim 3 wherein an outer surface of the fiber attachment sleeve is secured to a proximal portion of the outer sleeve by a seam weld.
21. The ferrule assembly of claim 20 wherein the seam weld between the outer surface of the fiber attachment sleeve and proximal portion of the outer sleeve extends around the entire circumference of an outer surface of the fiber attachment sleeve to produce a hermetic seal between the outer sleeve and the fiber attachment sleeve.