| 主权项 |
1. A laser device, comprising:
a first mirror with a first surface; a second mirror with a second surface at least partially facing the first surface of the first mirror, the first and second mirrors defining a resonant optical cavity in which electromagnetic energy is amplified by stimulated emission of coherent radiation that is partially transmitted through the second mirror; a semiconductor optical amplifier disposed at least partially between the first and second surfaces; wherein the semiconductor optical amplifier gain exceeds the loss for a time of about <1 ms within the resonant optical cavity; an electrical or optical pump providing energy to the semiconductor optical amplifier; and a graphene saturable absorber disposed at least partially between the first and second surfaces; wherein the graphene saturable absorber operates as a variable loss mechanism in the optical cavity allowing population inversion if the gain material exceeds the lasing threshold without the graphene and causing the stored optical energy to be released in optical pulses; wherein the laser device emits pulses stimulated coherent radiation through the second mirror with center wavelengths of about 1,800 nm or more and about 25,000 nm or less. |
