Light Condensing Substrate for VCSEL Measurement
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Solution Overview
Problem
The existing techniques are inadequate for accurately measuring high-power porous-type VCSELs due to their large light emission area, as most of the light emitted by these devices is not effectively incident on optical connectors, leading to difficulties in obtaining precise measurement results.
Innovation Solution
A connecting apparatus and light condensing substrate are designed to support electric and optical connectors, with a light condensing substrate that uses a truncated cone-shaped through hole to efficiently guide and condense light from the optical terminal of the semiconductor integrated circuit to the optical connector, minimizing light attenuation and ensuring accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard optical fiber probe is used for measurement, then single-hole VCSELs can be measured accurately, but porous-type VCSELs with large light emission areas cannot be measured accurately because most light is not incident on the optical fiber
Solution Approach 1:
The optical probe is designed with a light condensing part having a specific conical shape with a predetermined aperture angle. This local structural modification creates a region optimized for collecting light from large emission areas, allowing the same probe structure to effectively measure both single-hole and porous-type VCSELs by adapting the light collection geometry to match different emission patterns
2Quantity of substance
If the aperture angle of the light condensing part is increased to collect more light from porous-type VCSELs, then light collection efficiency improves, but measurement precision deteriorates due to increased reflection and attenuation
Solution Approach 1:
The aperture angle of the light condensing part is optimized to a specific range (30° to 60°). This parameter optimization balances two competing requirements: a larger angle collects more light from porous-type VCSELs while a smaller angle reduces reflection and attenuation. The predetermined angle within this range achieves the optimal compromise, ensuring both sufficient light collection and measurement precision across different VCSEL types
3Measurement precision
If precise alignment adjustments are implemented to improve light coupling, then measurement precision improves, but device complexity and operation difficulty increase
Solution Approach 1:
The light condensing part with its specific conical geometry and predetermined aperture angle provides inherent light collection capability that automatically adapts to different VCSEL emission patterns. This self-adjusting geometric design eliminates the need for complex external alignment mechanisms, achieving high measurement precision through the probe's intrinsic structure rather than through complex alignment procedures
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 allows for the effective condensation and guidance of light from optical terminals with large light emission surfaces to optical connectors, enabling precise measurement of light intensity in high-power porous-type VCSELs without the need for precise alignment adjustments, thus improving measurement accuracy.
Implementation Method 1
a light condensing substrate configured to condense light emitted by the optical terminal of the semiconductor integrated circuit to the optical connector
Data Source
AI summary
[Problem] To allow to condense and guide the light emitted by a light emitting element having a large light emission surface to an optical connector, in inspection of a semiconductor integrated circuit.[Solution] The present disclosure provides a connecting apparatus used at the time of inspection of a semiconductor integrated circuit, and the connecting apparatus includes an electric connector electrically connecting to an electrode terminal of the semiconductor integrated circuit, an optical connector optically connecting to an optical terminal of the semiconductor integrated circuit, a connector support substrate configured to support the electric connector and the optical connector so that an end part of the electric connector and an end part of the optical connector respectively connect to the semiconductor integrated circuit, and a light condensing substrate configured to condense light emitted by an optical terminal of the semiconductor integrated circuit to the optical connector.