laser diodes
Research Topic
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Research problems linked to this topic
- Vertical cavity surface emitting lasers (VCSELs) have been the subject of intense research in recent years.
- Power scaling in solid-state lasers is limited by thermally induced distortion and birefringence in the laser crystal.
- New kinds of semiconductor microcavity lasers are being created by modern semiconductor technologies like molecular beam epitaxy and electron beam lithography.
- Laser dicing of wafers is of keen interest to the semiconductor and LED industry.
- Ultraviolet (UV) and vacuum ultraviolet (VUV) radiation (generally defined as the 200-400 nm and 100-200 nm wavelength regions, respectively) is able to initiate photochemical reactions that are inaccessible to optical sources emitting radiation of longer wavelengths. A problem is producing these wavelengths from cold sources.
- High power semiconductor laser diodes are widely used for fiber laser pumping, solid-state laser pumping, materials processing, cosmetic treatment, laser display, solid-state lighting and military applications.
- Semiconductor Laser diodes (LD) employing quantum dot (QD) active regions have attracted attention due to the theoretical predictions: low threshold current density and low temperature sensitivity originated from the delta-function-like density of states and small active volume.
- InGaAs is a well-developed material system and has been firmly established as a candidate for the high-performance vertical-cavity surface-emitting lasers (VECSELs). InGaAs strained quantum wells (QWs) with GaAs, AlGaAs, and GaAsP barriers are widely used in optically pumped vertical-external-cavity surface-emitting lasers operating at 1𝜇m wavelength band. Although the performances of InGaAs strained QW VECSELs with GaAs, AlGaAs, or GaAsP barrier have been studied experimentally, there is still no theoretical investigation to explain these experimental results.
- Deep ultraviolet light-emitting diodes (DUV-LEDs) and laser diodes (LDs) with emission wavelengths in the range of 220-350 nm are expected for a wide variety of applications, such as sterilization, water purification, medicine and biochemistry, light sources for high-density optical recording, white light illumination, fluorescence analytical systems and related information sensing fields, air purification equipment, and zero-emission automobiles.