Optical assembly for laser generator

A system comprising:

• a laser generator comprising:
• a laser source producing a first beam of light;
• an optical assembly comprising:
• a prism having:
• a surface configured to receive the first beam at an incoming angle of incidence relative to a first surface normal;
• and
• an additional surface configured to transmit, at an exit angle relative to a second surface normal, a second beam having a second aspect ratio;
• a coupler;
• and
• a lens disposed between the prism and the coupler, wherein the lens is configured to transmit the second beam to a coupler;
• wherein the coupler comprises:
• a first coupling plane at a first distance from the lens;
• and
• a second coupling plane at a second distance from the lens;
• wherein the combination of the prism and the lens is configured to converge the second beam to a focal point between the lens and the coupler such that the second beam diverges between the focal point and the coupler, wherein the second beam comprises a third aspect ratio at the first coupling plane and comprises a fourth aspect ratio at the second coupling plane,
• wherein the first aspect ratio, second aspect ratio, third aspect ratio, and fourth aspect ratio are different from one another;
• and
• a catheter comprising a plurality of optical fibers, wherein the catheter comprises a proximal end and a distal end, wherein the proximal end is coupled to the coupler of the laser generator.