Patent ID: 6914926

Claim:
A laser gain media system, comprising: a lasing structure, said lasing structure including a first lasing chamber and a second lasing chamber, a flowing liquid host containing lasing active atoms or molecules whose energy storage time is comparable to or greater than the hosts characteristic thermal optical response time to heat impulses, said flowing liquid host having a lasing direction and a liquid flow direction, a circulation system for circulating said flowing liquid host into and out of said lasing structure transversely to said lasing direction, said circulation system comprising a closed loop for circulating said flowing liquid host through said first lasing chamber in a first linear direction and through said second lasing chamber in a second linear direction, wherein said first linear direction is opposite to said second linear direction, a semiconductor pumping device within said lasing structure, said semiconductor pumping device arranged such that the optical pump irradiance along said liquid flow direction is approximately uniform.