Edge Emitting Semiconductor Laser Phase Structure
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Solution Overview
Problem
Edge emitting semiconductor lasers with broad stripe designs face limitations in output power due to filamenting and catastrophic optical mirror damage, and the formation of phase structures to suppress higher lateral modes introduces coupling losses that impair efficiency.
Innovation Solution
The semiconductor laser design includes a waveguide region with a phase structure region formed outside the waveguide area, where the second cladding layer is partially removed or doped to create a small refractive index difference, reducing coupling losses and improving efficiency by minimizing the impact on the light-current characteristic curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase structures are formed in the waveguide to suppress higher lateral modes, then mode selection is improved, but coupling losses increase and efficiency deteriorates
Solution Approach 1:
The phase structure is extracted from the waveguide region and placed in the cladding layer instead. This separation allows the phase structure to perform mode selection without directly interfering with the light propagation in the waveguide, thereby reducing coupling losses while maintaining mode selection capability.
Solution Approach 2:
The cladding layer acts as an intermediary between the waveguide and the phase structure. By placing the phase structure in the cladding layer, it indirectly influences the lateral modes without causing strong coupling losses, as the cladding layer mediates the interaction between light and the phase structure.
2Power
If the active region width is increased to increase output power, then power output is improved, but filamenting and catastrophic optical mirror damage increase
Solution Approach 1:
The phase structure creates local variations in the refractive index within the cladding layer, which locally suppresses higher lateral modes without requiring a reduction in the overall active region width. This allows the broad stripe laser to maintain high output power while locally controlling mode distribution to prevent filamenting and catastrophic optical mirror damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses higher lateral modes while maintaining high efficiency by reducing coupling losses and improving the light-current characteristic curve, allowing for increased output power without catastrophic optical mirror damage.
Implementation Method 1
the effective refractive index deviates from the effective refractive index of the regions of the semiconductor body that adjoin in a lateral direction
Data Source
AI summary
An edge emitting semiconductor laser includes a semiconductor body, which has a waveguide region. The waveguide region has an active layer for generating laser radiation. The active layer is arranged between a first waveguide layer and a second waveguide layer. The waveguide region is arranged between a first cladding layer and a second cladding layer. The semiconductor body has a main region and at least one phase structure region in which is formed a phase structure for the selection of lateral modes of the laser radiation emitted by the active layer. The phase structure region is arranged outside the waveguide region or formed by a region in which a dopant is introduced or an intermixing structure is produced.