Laser Diode Mesa Reflective Coating for Accurate Optical Evaluation
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Solution Overview
Problem
Conventional methods for manufacturing laser diodes are not suitable for mass production due to the need for handling minutely divided laser bars and result in inaccurate property evaluations due to stray light emissions from non-resonator end faces.
Innovation Solution
A method involving an etching process to form a mesa structure with a resonator end face and a reflecting layer that covers the entire side surfaces of the mesa structure, including the resonator end faces, using a semiconductor lamination unit with n-type and p-type clad layers and a light-emitting layer with quantum wells, facilitating accurate property evaluations and enabling mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conventional method of splitting crystal along natural cleavage plane is used to expose resonator end face, then the mirror end face can be obtained, but handling of minutely divided laser bars is required which is not suitable for mass production
Solution Approach 1:
The invention segments the manufacturing process by forming multiple mesa structures simultaneously on a single semiconductor crystal substrate through etching. Each mesa structure contains a resonator end face, allowing multiple laser diodes to be manufactured in parallel without requiring division and handling of minutely divided laser bars, thus resolving the contradiction between maintaining mirror end face quality and enabling mass production
Solution Approach 2:
The invention transitions from a one-dimensional approach (processing individual laser bars sequentially) to a two-dimensional approach (forming multiple mesa structures across the crystal surface simultaneously). This dimensional change enables parallel processing of multiple resonator end faces, dramatically improving productivity while maintaining manufacturing precision through the light reflecting layer configuration
2Reliability
If the conventional method of splitting crystal is used, then laser diodes can be manufactured, but property evaluations are inaccurate due to stray light from portions other than resonator end faces
Solution Approach 1:
The invention extracts and eliminates the source of stray light by configuring the light reflecting layer to cover the entire side surfaces of mesa structures. This prevents light from portions other than resonator end faces from being emitted, thereby removing the harmful factor that causes measurement errors and enabling accurate property evaluations while maintaining laser diode performance
Solution Approach 2:
The invention converts the potential harmful effect of light emission from side surfaces into a beneficial configuration. By deliberately designing the light reflecting layer to cover entire side surfaces, any light that might otherwise become stray light is controlled and directed, transforming what could be a measurement interference into a structured optical path that aids in accurate evaluation
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 allows for accurate property evaluations with reduced measurement errors and improves the efficiency of laser diode manufacturing by eliminating the need for handling individual resonator end faces, making the process more suitable for mass production.
Implementation Method 1
an etching process of etching a semiconductor lamination unit to form a mesa structure having a resonator end face
Implementation Method 2
a reflecting layer forming process of forming a light reflecting layer such that the light reflecting layer covers entire side surfaces of the mesa structure
Data Source
AI summary
An object of the present invention is to provide a method for manufacturing an optical device having a laser diode, which method is suitable for mass production, and an optical device having a laser diode which allows accurate property evaluations thereof with small measurement errors. Specifically, the method includes: an etching process of etching a semiconductor lamination unit to form a mesa structure having a resonator end face, thereby forming a laser diode; and a reflecting layer forming process of forming a light reflecting layer such that the light reflecting layer covers entire side surfaces of the mesa structure, wherein the semiconductor lamination unit has a substate, a n-type clad layer including a nitride semiconductor layer having n-type conductivity, a light-emitting layer including at least one quantum well, and a p-type clad layer including a nitride semiconductor layer having p-type conductivity, laminated in this order.