Patent ID: 8890088

Claim:
A laser cavity two-photon spectroscopy, comprising: a collimation tube; a gain medium disposed in the collimation tube; a first reflector, disposed at a side of the gain medium; a second reflector movably disposed at a side of the gain medium relative to the first reflector; an electrical pumping module electrically connected to the gain medium, such that the gain medium is able to emit a light beam, and the light beam bounces back and forth between the first reflector and the second reflector and forms a laser beam through enhanced by the gain medium; a two-photon absorption cell disposed between the gain medium and the second reflector, wherein the two-photon absorption cell comprises a plurality of two-photon absorption mediums, the two-photon absorption mediums absorb a portion of the laser beam reflected between the first reflector and the second reflector and then emit fluorescence; and a first lens disposed in the collimation tube and between the gain medium and the two-photon absorption cell for focusing the laser beam into the two-photon absorption cell.