3results about How to "Lower laser threshold" patented technology

The application provides a Debye temperature operating laser device, which comprises a vacuum cavity, a laser gain medium and a heat sink sample table located in the vacuum cavity, the heat sink sample table is used to fix the laser gain medium, a pumping module is used to provide pumping light for the laser gain medium, and a temperature adjusting module is correspondingly matched with the heat sink sample table, the temperature adjusting module is configured to adjust the temperature of the heat sink sample table so that the working temperature of the laser gain medium is stably kept at the Debye temperature. The Debye temperature operating laser device is used to realize the operation of the laser gain medium at the Debye temperature, which can theoretically improve the thermal and optical performance, obtain laser output with high power, high beam quality and high efficiency, and provide support and impetus for the application and development of laser technology.

The application discloses application of two-dimensional transition metal boride in a saturable absorber and a laser, and the two-dimensional transition metal boride is Mo 4 / 3 B 2‑x T z The application builds a fiber laser based on two-dimensional Mo 4 / 3 B 2‑x T z , optimizes Mo 4 / 3 B 2‑ x T z saturable absorber and a cavity structure of the fiber laser, and after adjusting pump power and a polarization state in the cavity, self-starting of ultrashort and high-repetition-rate mode-locked pulses is realized.

The application discloses a preparation method of a near-infrared vertical cavity surface laser with low threshold and high gain based on weakly confined quantum dots, and belongs to the technical field of quantum dot lasers. A CdS shell layer is grown on the weakly confined double-tapered CdSe quantum dots, and the thickness of the CdS shell layer is controlled to be 2 layers by controlling the injection amount of dodecanethiol; the CdSe / CdS quantum dots are spin-coated on the high-reflection surface of two Bragg reflectors (DBRs); and the surfaces coated with the quantum dots are close to each other and are spliced to form a vertical cavity surface laser. The vertical cavity surface laser constructed by taking the weakly confined double-tapered hexahedral CdSe / CdS quantum dots as deep red gain material has deep red / near-infrared laser emission of 720 nm, an extremely low laser threshold of 11.23 µJ / cm 2 and an extremely wide gain bandwidth of 670-730 nm.