Mode Scrambler for Uniform Pump Light in Laser Devices
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Solution Overview
Problem
The deformation of multi-mode fibers during installation in laser light emitting devices leads to stress-induced non-uniformity in light intensity distribution, affecting the quality and accuracy of laser beams used in surveying instruments, resulting in low yield and high costs due to the need for precise adjustment of laser diodes.
Innovation Solution
Incorporating a mode scrambler on the multi-mode fiber to uniformly distribute the light intensity by mechanically deforming the fiber, eliminating the need for selective laser diode selection or adjustment, and enhancing the quality of the laser beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser diode selection or light emitting condition adjustment is performed to uniform light intensity distribution, then light intensity uniformity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
A mode scrambler is introduced as an intermediary component between the laser diode and the optical system. This device actively scrambles the spatial mode distribution of the laser beam, transforming non-uniform light intensity distribution into uniform distribution without requiring precise laser diode selection or adjustment. The mode scrambler acts as a mediator that converts harmful non-uniformity into useful uniformity, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The invention changes the spatial mode parameters of the laser beam by introducing a mode scrambler. Instead of maintaining fixed laser diode characteristics through selection and adjustment, the system dynamically transforms the beam's spatial distribution parameters. This parameter transformation approach achieves uniform light intensity distribution while simplifying the manufacturing process, as the mode scrambler can be universally applied without requiring precise laser diode matching.
2Manufacturing precision
If laser diode selection and adjustment are required to achieve uniform light intensity, then light quality is improved, but production yield decreases
Solution Approach 1:
The mode scrambler serves as a universal intermediary component that can be applied to various laser diodes without requiring precise selection or adjustment of each individual diode. This standardized approach significantly increases production yield by eliminating the need for time-consuming matching and adjustment processes, while still achieving uniform light intensity distribution through active mode scrambling.
Solution Approach 2:
The mode scrambler enables the laser system to self-correct non-uniform light intensity distribution automatically. Rather than requiring external intervention through careful laser diode selection and adjustment during manufacturing, the mode scrambler actively transforms the beam characteristics in real-time, allowing the system to achieve uniform output regardless of the initial laser diode characteristics. This self-service capability dramatically improves production efficiency and yield.
3Manufacturing precision
If precise adjustment of laser diodes is performed, then light intensity uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The mode scrambler acts as a cost-effective intermediary component that replaces expensive and time-consuming laser diode selection and adjustment processes. By introducing this single standardized component, the system achieves uniform light intensity distribution without requiring skilled manual adjustment or expensive precision laser diodes, thereby significantly reducing manufacturing costs while maintaining high manufacturing precision.
Solution Approach 2:
The invention changes the approach to achieving uniformity from parameter control during manufacturing (laser diode selection and adjustment) to parameter transformation during operation (mode scrambling). This parameter transformation strategy uses a simple, low-cost mode scrambler to actively transform the beam's spatial distribution, eliminating the need for expensive precision components and adjustment processes, thus reducing manufacturing costs while maintaining high precision.
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 mode scrambler ensures consistent light intensity distribution, improving the yield and reducing manufacturing costs of laser light emitting devices and surveying instruments by stabilizing light emission and reducing manufacturing complexity.
Implementation Method 1
Stress is generated inside the multi-mode fiber due to deformation and the generated stress exerts influence on an advancing condition of a laser beam which propagates the multi-mode fiber
Data Source
AI summary
The invention provides a laser light emitting device, which comprises a laser light emitter for emitting a pump light, a resonator for emitting a laser beam by oscillating and amplifying the pump light and a multi-mode fiber for guiding the pump light emitted from the laser light emitter to the resonator, wherein a mode scrambler is provided on the multi-mode fiber, the pump light propagating the multi-mode fiber is stirred and a light intensity distribution is unified by the mode scrambler, and the pump light is entered to the resonator.