Laser diodes are made from direct band-gap semiconductors, typically gallium arsenide (GaAs) or indium phosphide (InP) for infrared and visible wavelengths. The fabrication begins with epitaxial growth on an N-doped substrate, where successive layers are deposited: an undoped active layer (often containing quantum wells for higher efficiency and lower threshold current), followed by a P-doped cladding layer and a contact layer. This layered structure forms the PIN junction essential for charge injection and stimulated emission .
Once the epitaxial layers are grown, photolithography is used to define the laser diode geometry, such as mesas or ridge structures. A mask is applied, and selective etching removes unwanted material to create the desired pattern. This step ensures precise control over the optical and electrical properties of the diode .
After patterning, dielectric layers are deposited to provide insulation and protect the device. Metallization follows, forming electrical contacts on the P and N regions to allow current injection. These contacts are critical for efficient operation and long-term reliability .
The laser cavity is defined by cleaving the semiconductor wafer to expose the laser facets, which act as mirrors for the optical resonator. In some designs, additional coatings are applied to the facets to control reflectivity and output power .
Individual laser diodes are bonded to heat sinks or submounts to manage thermal load, as excessive heat can degrade performance. The diode may then be packaged with optical components, such as lenses or fiber couplers, depending on the application. Common types of laser diodes include Fabry-Perot (FP), Distributed Feedback (DFB), and Vertical Cavity Surface Emitting Lasers (VCSELs), each requiring slight variations in fabrication and assembly .
In essence, laser diode fabrication combines semiconductor epitaxy, microfabrication, and precision assembly to produce a device capable of emitting coherent, monochromatic, and highly directional light. The process is highly controlled to ensure efficiency, stability, and long operational lifetime, making laser diodes suitable for telecommunications, medical devices, and industrial applications .
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