Method and laser for breaking limitation of fluorescence spectrum on laser wavelength

A method for breaking a limitation of fluorescence spectrum on a laser wavelength, comprising:

• in a laser gain medium, exciting electrons to a high energy level by a pump light, and suppressing an oscillation of radiation light during electron transition from the high energy level to a low energy level by coating a laser resonator,
• at the same time, using a laser resonance to enhance a transition probability of an electron-phonon coupling from the high energy level to a multi-phonon coupling level, so as to realize an emission and enhancement of breaking through fluorescence spectrum and realize an oscillation of radiation light during electron transition from the high energy level to the multi-phonon coupling level,
• wherein the laser resonator comprises an incident mirror, a folding mirror, a tuning element and an exit mirror arranged in sequence along an optical path direction,
• the laser gain medium is located between the incident mirror and the folding mirror in the laser resonator,
• and the tuning element is arranged in the laser resonator at a Brewster angle;
• a wavelength of the pump light emitted by the pump source is 1.0795 μm, and the pump source is Nd:YAP laser, a focusing system is composed of a convex lens with a focal length of 50 mm, the laser gain medium is NaCl(OH—):F2+ color center laser crystal, the crystal is placed in a clear crystal chamber cooled by liquid nitrogen at Brewster angle, the crystal chamber is kept in vacuum, and a crystal surface is polished and plated with dielectric film with high transmission to a wavelength band of 1080 nm and 1400-1800 nm;
• the laser resonator comprises the incident mirror plated with dielectric film A with high transmission to the wavelength band of 1080 nm and 1400-1800 nm and high reflection to a wavelength band of 1800-2000 nm, the folding mirror plated with dielectric film B with high transmission to the wavelength band of 1080 nm and 1400-1800 nm and total reflection to the wavelength band of 1800-2000 nm, and the exit mirror plated with dielectric film C with high transmission to the wavelength band of 1080 nm and 1400-1800 nm and partial reflection to the wavelength band of 1800-2000 nm, the tuning element is a prism placed at Brewster angle, and the tuned laser with wavelength from 1800-2000 nm is output by rotating the tuning element.