Nitride Semiconductor Laser Impurity Region for End Face Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nitride semiconductor laser elements face challenges in maintaining high-output performance due to heat generation and catastrophic optical damage at resonator end faces, caused by light absorption, which existing methods struggle to adequately address while preserving beam shape and active layer integrity.
Innovation Solution
A nitride semiconductor laser element with an impurity introduction region at the resonator end faces, featuring an asymmetric impurity concentration distribution, and a manufacturing method involving a protective layer with varying thickness for ion implantation, which suppresses light absorption and heat generation by widening the bandgap in the optical output region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window structure or AlGaInN protective film is formed at the resonator end face, then light absorption is suppressed and heat generation is reduced, but the beam shape cannot be adjusted and the active layer may be damaged during manufacturing
Solution Approach 1:
The patent applies local quality by creating an impurity introduction region with asymmetric concentration distribution specifically at the optical output region of the resonator end face. This localized modification widens the bandgap only where needed to suppress light absorption and heat generation, while leaving other regions unchanged to maintain beam shape control and active layer integrity.
2Reliability
If ions are implanted in the contact layer near resonator end faces to form a current non-implantation region, then optical non-absorption region is created, but it is difficult to adjust beam shape and active layer damage occurs during manufacturing
Solution Approach 1:
The patent employs parameter changes by introducing impurities with specific asymmetric concentration distributions at the resonator end face. This changes the bandgap parameter locally to create an optical non-absorption region while avoiding the manufacturing damage associated with ion implantation in the contact layer, thus preserving active layer integrity.
3Reliability
If the bandgap is widened at the optical output region to suppress light absorption, then heat generation is reduced and service life is extended, but the impurity concentration distribution must be precisely controlled
Solution Approach 1:
The patent utilizes asymmetry by implementing an impurity concentration distribution that is asymmetric with respect to the peak position in the lamination direction. This asymmetric distribution optimally widens the bandgap at the optical output region to suppress light absorption and heat generation while managing the precision requirements through controlled asymmetry rather than uniform distribution.
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 effectively reduces light absorption and heat generation at resonator end faces, enhancing the service life and output of the nitride semiconductor laser element while maintaining its characteristics.
Implementation Method 1
the bandgap is widened for the optical output region of resonator end faces... said optical output region has a wider bandgap than other regions in the active layer
Implementation Method 2
outputted light is absorbed at resonator end faces... this absorption generates heat at the resonator end faces
Implementation Method 3
this absorption generates heat at the resonator end faces. The heat that is generated raises the temperature at the resonator end faces
Data Source
AI summary
A nitride semiconductor laser element, has: a nitride semiconductor layer including a first nitride semiconductor layer, an active layer, and a second nitride semiconductor layer laminated in that order; and resonator end faces formed mutually opposing at the end of said nitride semiconductor layers, wherein an impurity is contained in at least an optical output region of the resonator end faces, with the concentration of said impurity having a concentration distribution that is asymmetric in reference to a peak position, in the lamination direction of the nitride semiconductor layers, and said optical output region has a wider bandgap than other regions in the active layer or said optical output region has a higher impurity concentration than other regions in the active layer.