Optical fiber lasing apparatus lens

An optical fiber lasing apparatus, comprising:

• laser radiation generation means to emit laser radiation of sufficient energy output to lase a channel through a predetermined material;
• an optical fiber element having proximal and distal portions and a proximal and a distal end, said proximal end being optically coupled to said laser radiation generation means, said optical fiber element conducting said laser radiation emitted from said laser generation means from said proximal end to be emitted at said distal end;
• and
• a lens secured to said distal portion of said optical fiber element, said lens having a first lens surface adjacent to and spaced from said distal end of said optical fiber element and positioned to receive laser radiation emitted therefrom, and a second lens surface positioned to emit laser radiation from said lens, said second lens surface being substantially convex, said first lens surface being shaped to provide a predetermined emission pattern from said second lens surface;
• and
• a tubular ferrule element disposed over said distal end of said optical fiber element to protect said distal end of said optical fiber element and to space said first lens surface from said distal end of said optical fiber.

An optical fiber lasing apparatus, comprising:

• laser radiation generation means to emit laser radiation of sufficient energy output to lase a channel through a predetermined material;
• an optical fiber element having proximal and distal portions and a proximal and a distal end, said proximal end being optically coupled to said laser radiation generation means, said optical fiber element conducting said laser radiation emitted from said laser generation means from said proximal end to be emitted at said distal end;
• and
• a lens secured to said distal portion of said optical fiber element, said lens having a first lens surface adjacent to and spaced from said distal end of said optical fiber element and positioned to receive laser radiation emitted therefrom, and a second lens surface positioned to emit laser radiation from said lens, said second lens surface being substantially convex, said first lens surface and said second lens surface respectively defining rearward and forward directions for said lens, said first lens surface being shaped to provide a predetermined emission pattern from said second lens surface over a predetermined area forward of said lens, said laser radiation being substantially contained to said area and being emitted substantially uniformly over said area;
• wherein the space between the distal end of said optical fiber element and said first lens surface is occupied by a substance of preselected optical transmission characteristics.

A method of constructing a lens assembly for an optical fiber comprising:

• forming a lens element having a substantially cylindrical outer surface terminating in a substantially convex first end and a substantially cylindrical cavity in a second end opposed to said first end;
• a said cavity being sized to receive an optical fiber, said cavity being larger than the diameter of said optical fiber
• inserting the distal end of said optical fiber into said cavity in an attitude substantially aligned with the axis of said cylindrical outer surface;
• providing a space between said distal end of said optical fiber and the end of said cavity, such that a predetermined emission pattern of radiation is emitted form said lens element when laser radiation is input into the proximal end of said optical fiber and such that radiation so emitted will spread before being received at the end of said cavity, said emission pattern being such that radiation is substantially contained to an area directly opposite said first end of said lens element and being emitted substantially uniformly over said area;
• and
• bonding the distal end of said optical fiber to said lens element.