Laser Light Source Module for Fast-Axis Coupling Alignment
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Solution Overview
Problem
The use of a fast axis collimator lens with a short focal length in a light source module leads to displacement from the optimal position, resulting in lower coupling efficiency between the laser light and the target, such as an optical fiber.
Innovation Solution
A light source module design featuring a platform with a staircase-shaped arrangement of optical units, each including a semiconductor laser element, a fast axis cylindrical lens, a first fast axis adjustment lens, and a slow axis collimator lens, with specific focal length relationships defined by formulas to optimize optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fast axis collimator lens with a short focal length is used to spatially combine laser light in the fast axis direction, then the coupling efficiency between laser light and optical fiber is improved, but the position of the lens is displaced from the optimal position due to manufacturing tolerances
Solution Approach 1:
The patent introduces an adjustable mechanism that allows the fast axis collimator lens to be dynamically positioned along the optical axis after assembly. This enables post-manufacturing adjustment to compensate for positional deviations caused by manufacturing tolerances, thereby maintaining high coupling efficiency without requiring extremely precise manufacturing.
Solution Approach 2:
The patent changes the positional parameter of the fast axis collimator lens along the optical axis through mechanical adjustment. By allowing the lens position to be varied within a certain range, the system can optimize the coupling efficiency parameter to achieve the desired performance despite manufacturing variations.
2Volume of moving object
If the fast axis collimator lens is fixed in the vicinity of the light-emitting part, then the optical system is compact, but the optical axis is displaced from the optimal position
Solution Approach 1:
The patent makes the lens position dynamic rather than fixed, allowing adjustment along the optical axis while maintaining a compact overall structure. The adjustable mechanism enables precise optical axis alignment without significantly increasing the system volume.
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 design achieves high coupling efficiency by precisely adjusting the optical axis alignment, enhancing the integration of laser light with optical fibers.
Implementation Method 1
a fast axis cylindrical lens that is a lens on which the laser light emitted from the semiconductor laser element is incident, and that focuses the laser light in a fast axis direction of the laser light
Implementation Method 2
a first fast axis adjustment lens that is a lens on which the laser light that exits from the fast axis cylindrical lens is incident, and that adjusts an optical axis of the laser light in the fast axis direction
Implementation Method 3
a slow axis collimator lens that is a lens on which the laser light that exits from the first fast axis adjustment lens is incident, and that collimates the laser light in a slow axis direction of the laser light
Data Source
AI summary
A light source module includes: a plurality of optical units, wherein each of the plurality of optical units includes: a semiconductor laser element that emits laser light; a fast axis cylindrical lens (FACL); a first fast axis adjustment lens (first lens); and a slow axis collimator lens (SACL), and α satisfies Formula 1: α=F2/F1 (Formula 1), β satisfies Formula 2: β=d/F2 (Formula 2), and when F2>0, α and β satisfy Formula 3, Formula 4, Formula 5, and Formula 6: α>1 (Formula 3), αβ>1 (Formula 4), β<(1/α)+(⅓) (Formula 5), β<1 (Formula 6), where F1 denotes an effective focal length of the FACL, F2 denotes an effective focal length of the first lens, and d denotes a distance between a principal point of the FACL and a principal point of the first lens.