2 results about "Quantum dot lasers" patented technology

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.

This invention discloses a high-power liquid quantum dot laser amplifier. After the pump beam enters the amplifier, it is split into optical path I and optical path II. Optical path I and optical path II then simultaneously reach a second liquid quantum dot laser medium. Optical path I, along the incident direction of the pump beam, sequentially comprises: a beam splitter, a cylindrical mirror, a first liquid quantum dot laser medium, a reflective blazed grating, a tunable total reflection mirror, an output coupling mirror, a total reflection mirror, an aperture, a collimating lens, and a second liquid quantum dot laser medium. Optical path II, along the incident direction of the pump beam, sequentially comprises: a beam splitter, two mirror-mounted right-angle prisms, a collimating lens, a focusing lens, and a second liquid quantum dot laser medium. The method provided by this invention is stable and universal, achieving stable high-power tunable liquid quantum dot laser output, effectively overcoming the shortcomings of existing organic dye molecular lasers, such as easy deactivation of the gain medium and low operational stability at high power.