Patent ID: 11876340
Assignee: SHANGHAI INSTITUTE OF MICROSYSTEM AND INFORMATION TECHNOLOGY, CHINESE ACADEMY OF SCIENCES
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 9:
10. An N-stage cascade laser, wherein the N-stage cascade laser at least comprises a first-stage laser and a subsequent N-1-stage laser;
the first-stage laser is the laser as in claim 1;
a subsequent ith-stage laser comprises:
an ith-stage medium, having a ground state, an intermediate state, and an excited state in ascending order of energy, wherein the excited state is a single level, multiple levels, or continuous levels state;
an ith-stage excitation system, configured to excite atoms in the ith-stage medium from the ground state to the intermediate state;
an ith-stage excitation laser, wherein the ith-stage excitation laser is an ith-stage laser, a laser generated by the ith-stage excitation laser is used to drive the atoms in the intermediate state at different spatial positions in the ith-stage medium to the ground state through a stimulated emission process with a fixed phase relationship, to emit coherent photons to form an ith-stage laser, wherein there are two ways for the stimulated emission process, the first way is to excite the electrons in the intermediate state to the excited state and drive the atoms in the excited state to the ground state, and the second way is to directly drive the atoms in the intermediate state to the ground state; and
N is an integer greater than or equal to 2, and i is an integer greater than or equal to 2 and less than or equal to N.