EP-VECSEL Array Layout for Hermite-Gaussian Beam Scaling
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Solution Overview
Problem
Vertical External Cavity Surface Emitting Lasers (VECSELs) face limitations in power scaling due to difficulties with carrier injection into the active region, which restricts the achievable output power, especially in electrically pumped designs, whereas optically pumped VECSELs can easily scale by increasing the pumping area but lack the ability to generate higher-order Hermite Gaussian modes with unique properties like orbital angular momentum and self-healing.
Innovation Solution
The development of an Electrical Pumping Vertical External Cavity Surface Emitting Lasers (EP-VECSEL) device with multiple pumping areas allows for configurable Hermite Gaussian mode shape generation, utilizing a design with a first and second reflective element, an active region with emitters, and an array output coupler, enabling efficient power scaling and coherent beam combining through piezoelectric element-controlled beam manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical pumping is used in VECSELs, then device complexity is reduced and ease of operation is improved, but achievable output power is limited due to carrier injection difficulties
Solution Approach 1:
The patent divides the active region into multiple discrete pumping areas, each capable of independent carrier injection. This segmentation allows the system to overcome the limitation of single-area electrical pumping by distributing the pumping function across multiple zones, enabling higher total output power while maintaining electrical pumping simplicity.
Solution Approach 2:
The patent combines multiple electrically pumped laser beams into a single coherent output through beam combining techniques. By merging the output from multiple pumping areas, the system achieves higher total power output while retaining the operational simplicity of electrical pumping, thus resolving the contradiction between ease of operation and achievable power.
2Power
If optical pumping is used to increase pumping area for power scaling, then achievable output power is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent replaces the mechanical/optical pumping system with an electrical pumping system that uses electronic carrier injection. This substitution eliminates the need for complex optical pumping apparatus while achieving comparable or superior power scaling through multiple electrical pumping areas, thus reducing device complexity while maintaining high power output.
3Device complexity
If single pumping area is used in electrically pumped VECSELs, then device complexity is minimized, but beam shaping capability for higher-order HG modes is lost
Solution Approach 1:
The patent segments the pumping area into multiple independent regions that can be individually controlled. This segmentation enables different spatial patterns of carrier injection, which directly translates to the ability to generate higher-order Hermite-Gaussian modes while keeping the overall device structure relatively simple.
Solution Approach 2:
The patent introduces dynamic control over the multiple pumping areas, allowing the system to switch between different pumping patterns and generate different beam modes on demand. This dynamic capability provides versatile beam shaping without requiring complex static structures, resolving the contradiction between device complexity and adaptability.
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 design enables efficient power scaling and flexible beam shaping, overcoming previous limitations by allowing uniform carrier injection and coherent combining of multiple lasers into desired Hermite Gaussian modes, enhancing the output capabilities of VECSELs.
Implementation Method 1
coherent beam combining through piezoelectric element-controlled beam manipulation
Implementation Method 2
a first reflective element... a second reflective element disposed on the active region, configured to reflect the plurality of lasers
Implementation Method 3
an active region comprising emitters, disposed on the first reflective element and configured to accept a signal at two or more emitters on the active region such that these emitters produce a plurality of lasers
Data Source
AI summary
An electrical pumping vertical external-cavity surface-emitting laser (EP-VECSEL) device. The device includes a first reflective element and an active region comprising a plurality of emitters, disposed on the first reflective element configured to accept an electrical current at multiple emitters on the active region such that the multiple emitters produce a plurality of lasers. The multiple emitters may be configured to form a desired Hermite Gaussian (HG) mode shape. The device includes a second reflective element disposed on the active region. The device further includes an array output coupler disposed optically in line with the second reflective element such that the plurality of lasers are directed into the array output coupler.