Laser Arrangement With External Cavity And Voltage Monitoring
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Solution Overview
Problem
Current laser measurement techniques are complex and require additional optical components for wavelength stabilization, leading to increased size and potential interference, while simplifying the measurement of emission wavelength and material properties remains a challenge.
Innovation Solution
A laser arrangement with an external cavity and integrated optical waveguide that uses the voltage at the active section to detune the emission wavelength, eliminating the need for additional feedback signals and enabling a compact design by leveraging the interference of light within the cavity to stabilize the wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional optical components (e.g., filters or photodiodes) are used to generate feedback signals for wavelength stabilization, then wavelength stabilization is achieved, but device complexity and size increase
Solution Approach 1:
The laser diode's active section serves dual purposes: generating light and providing wavelength stabilization feedback. The voltage at the active section is used directly as the monitor signal, eliminating the need for separate optical components. The system uses itself (the active section's voltage) to stabilize its own wavelength.
Solution Approach 2:
The active section of the laser diode performs multiple functions: it generates the laser light and simultaneously provides the monitor signal for wavelength stabilization. This multi-functionality reduces the need for separate components and simplifies the overall device structure.
2Measurement precision
If additional optical components are added for wavelength measurement, then measurement capability is improved, but compact design is compromised
Solution Approach 1:
The wavelength measurement functionality is merged with the existing laser structure by using the voltage at the active section as the monitor signal. This combines the light generation and wavelength monitoring functions into a single integrated structure, enabling compact design.
Solution Approach 2:
The laser diode's active section provides its own voltage signal for wavelength measurement without requiring external sensing components. This self-service approach eliminates additional volume requirements for separate measurement devices.
3Object-affected harmful factors
If optical filters are added to avoid interference, then interference is reduced, but device complexity and size increase
Solution Approach 1:
The need for optical filters to manage interference is extracted and eliminated by using the electrical voltage at the active section as the monitor signal. This approach removes the harmful requirement for additional optical filtering components while maintaining interference management capability.
Solution Approach 2:
The optical filtering approach is replaced with an electrical measurement approach. Instead of using optical filters to manage interference, the patent uses electrical voltage measurement at the active section, substituting optical components with electrical sensing.
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 high output power and compact design with reduced interference, enabling precise wavelength measurement and material property determination without additional optical components, facilitating the development of chip-integrated measuring devices.
Implementation Method 1
The light reflected back interferes with the light in the laser cavity, which has an influence on the electrical voltage on an active section of the laser
Implementation Method 2
an external cavity in a free-beam arrangement that interacts with a laser, with the electrical voltage at an active section of the laser being used to determine a distance
Implementation Method 3
the external cavity having an optical waveguide coupled to the laser
Data Source
Figure 1
AI summary
The invention relates to a laser arrangement, comprising a laser (2) having a laser cavity (20); a least one cavity (30) external to the laser (2) which reflects one part of the light emitted by the laser (2) back into the laser cavity (20); a voltage measuring device (4) for measuring a voltage on an active section (21) of the laser (2), wherein an imbalance of the emission wave length of the laser (2) and/or a property of a material adjacent to the external cavity (30) can be determined. According to the invention, the external cavity (30) comprises an optical waveguide (34) coupled to the laser (2). The invention also relates to a method for controlling a laser and to a measuring method.