Optically Pumped Surface-Emitting Laser Mode Control
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Solution Overview
Problem
Optically pumped surface-emitting semiconductor lasers face instability in laser emission over time due to excitation of higher resonator modes, which affects thermal behavior and efficiency.
Innovation Solution
Incorporation of a mode-selective apparatus firmly connected to the semiconductor body to suppress higher resonator modes, using a metal coating or structured surface to selectively absorb or reflect pump radiation, ensuring only the transverse fundamental mode is excited, thereby stabilizing laser emission and improving thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mode-selective apparatus is firmly connected to the semiconductor body to suppress higher resonator modes, then laser emission stability is improved, but device complexity increases
Solution Approach 1:
The mode-selective apparatus is firmly connected to the semiconductor body, merging the mode selection function with the laser structure. This integration suppresses higher resonator modes while maintaining a compact design, resolving the contradiction between stability improvement and complexity increase by combining functions rather than adding separate components
Solution Approach 2:
The mode-selective apparatus is positioned at specific locations on the semiconductor body to target and suppress higher resonator modes locally. This localized approach achieves mode control without requiring comprehensive modification of the entire device, thereby improving stability while limiting the increase in overall device complexity
2Power
If pump radiation is absorbed by the semiconductor body to generate charge-carrier pairs, then laser radiation production is improved, but thermal behavior deteriorates
Solution Approach 1:
The mode-selective apparatus acts as an intermediary element that modifies the pump radiation before it enters the semiconductor body. By controlling which resonator modes are excited, it optimizes the distribution of absorbed pump energy, enhancing laser radiation production while reducing unwanted thermal effects from inefficient energy conversion
Solution Approach 2:
The invention changes the optical parameters of the system by introducing the mode-selective apparatus, which alters the resonator mode distribution. This parameter change enables more efficient pump radiation utilization for laser generation while reducing the portion of energy converted to heat, thus improving power output without proportionally increasing temperature
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
The solution achieves stable long-term laser emission by preventing higher resonator modes and optimizing thermal behavior, enhancing the semiconductor laser's efficiency and reliability.
Implementation Method 1
using a metal coating or structured surface to selectively absorb or reflect pump radiation
Implementation Method 2
using a metal coating or structured surface to selectively absorb or reflect pump radiation
Implementation Method 3
The pump radiation produces charge-carrier pairs, for example, in the radiation-producing layer sequence of the semiconductor body
Implementation Method 4
Electromagnetic radiation is then produced by recombination of the charge-carrier pairs
Implementation Method 5
The semiconductor body preferably furthermore has a reflective layer or layer sequence which is suitable for reflection of at least a portion of the electromagnetic radiation produced in the layer sequence
Data Source
AI summary
An optically pumped, surface-emitting semiconductor laser having a mode-selective apparatus (7) which is intended for suppression of predeterminable, higher resonator modes of the semiconductor laser. The mode-selective apparatus is arranged in the beam path of a pump beam source (2) of the surface-emitting semiconductor laser.