Shared Multi-Wavelength Laser Resonator Design
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Solution Overview
Problem
Current laser transmitters for precision targeting applications are complex and require multiple parts to achieve multi-wavelength output, leading to increased size and weight, which is not suitable for compact and efficient use in applications like laser target designation and range-finding.
Innovation Solution
A compact laser system utilizing two diode-pumped gain elements with a simple folded cavity and a dual wavelength intra-cavity polarizer, allowing for electronic wavelength selection and active thermal lens control, which reduces the number of components and simplifies the system while maintaining high brightness and beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple laser sources and electroabsorption modulators are used to achieve multi-wavelength output, then wavelength versatility is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple laser sources (1064nm and 1550nm) and their modulation components into a single shared resonator cavity. This merging approach allows both wavelength sources to coexist and operate simultaneously within one integrated system, reducing the need for separate laser assemblies and simplifying the overall device architecture while maintaining multi-wavelength capability
Solution Approach 2:
The shared resonator cavity serves multiple functions: it provides the optical path for both 1064nm and 1550nm laser sources, houses the electroabsorption modulators for both wavelengths, and enables wavelength selection through a single tunable filter. This multi-functional design eliminates the need for separate dedicated cavities for each wavelength, reducing device complexity
2Adaptability or versatility
If multiple intra-cavity elements are used for wavelength conversion, then multi-wavelength output is achieved, but device complexity and weight increase
Solution Approach 1:
The patent merges the wavelength conversion functionality into the existing resonator cavity by placing electroabsorption modulators and a tunable filter within the same optical path. This integration eliminates the need for separate wavelength conversion modules and reduces the overall number of discrete optical components, thereby reducing device weight
Solution Approach 2:
The patent uses an intermediary approach by employing electroabsorption modulators that can be electrically controlled to select different wavelengths. This electrical control mechanism replaces heavier mechanical tuning devices and allows for lightweight, compact design while maintaining wavelength versatility
3Adaptability or versatility
If angle and temperature tuning is used to attain specific wavelengths, then wavelength selection capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical angle tuning and temperature control mechanisms with electrically controlled electroabsorption modulators. These modulators can be tuned to specific wavelengths through electrical signals, eliminating the need for complex mechanical adjustment devices and temperature control systems, thereby reducing device complexity
Solution Approach 2:
The patent changes the control parameter from mechanical angle/temperature to electrical voltage/frequency for wavelength selection. By using electroabsorption modulators that respond to electrical parameters, the system achieves wavelength tuning without the mechanical complexity of angle adjustment or thermal management systems
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 provides high peak-power, multi-wavelength laser output with improved beam quality and reduced size, suitable for long-range applications such as laser target designation and eye-safe rangefinders, while eliminating the complexity of active electro-optic Q-switching and reducing the transmit aperture.
Implementation Method 1
first and second independently pumped gain modules defining a lasing plane
Implementation Method 2
at least one polarizing waveplate positioned in the lasing plane
Implementation Method 3
a plurality of non-linear optical crystals positioned in the lasing plane... oriented to convert only S-polarized light
Implementation Method 4
The NLO crystals may be used as frequency doublers, providing second harmonic generation, or as optical parametric oscillators
Implementation Method 5
a passive Q-switch positioned in the lasing plane between the non-linear optical crystals and the first independently pumped gain element; capable of producing a laser beam of improved quality... high peak-power, Q-switched pulses
Data Source
AI summary
The present invention provides improved laser beam quality with fewer parts than the current method demands and decreasing the transmit aperture, said apparatus comprising: two or more independently pumped gain modules, two or more pump diodes, a polarizing waveplate, non-linear optical crystals, and a passive Q-switch.