Non-monolithic Chip Laser Polarization Control
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Solution Overview
Problem
Chip lasers with passive triggering lack control over the polarization of the laser beam due to the beam propagating through a single medium of substantially constant refractive index, which is detrimental for stability and wavelength conversion applications.
Innovation Solution
A chip laser with a non-monolithic structure featuring deflection means between the input and output mirrors, allowing for the selection of a single polarization direction and wavelength filtering, achieved through the use of separation media with different refractive indices and inclined deflection surfaces, such as those at the Brewster angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a monolithic structure with a single medium of constant refractive index is used, then the device complexity is reduced and manufacturing is simplified, but the polarization control capability is lost
Solution Approach 1:
The laser cavity is segmented into multiple sections with different refractive indices, including a first section with refractive index n1, a second section with refractive index n2, and a third section with refractive index n3. This segmentation allows each section to contribute differently to the overall laser operation, enabling polarization control while maintaining a compact chip-scale structure.
Solution Approach 2:
Different sections of the laser cavity are assigned different local optical properties, specifically different refractive indices. The first section has refractive index n1, the second section has refractive index n2, and the third section has refractive index n3. This local differentiation of optical properties enables the beam to experience varying refraction effects at different locations, which is essential for polarization selection and control.
2Adaptability or versatility
If deflection means with multiple refractive indices are introduced, then polarization selection and wavelength filtering are enabled, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into a single integrated chip structure. The deflection means simultaneously provides polarization selection, wavelength filtering, and beam direction control. The multiple sections with different refractive indices are combined in one compact arrangement, eliminating the need for separate external optical components and reducing overall device complexity despite the enhanced functionality.
Solution Approach 2:
The deflection means with multiple sections of different refractive indices serves multiple functions simultaneously: it acts as a polarization selector, a wavelength filter, and a beam direction controller. This multi-functionality is achieved within a single integrated structure, making the device more versatile without proportionally increasing complexity.
3Adaptability or versatility
If a non-monolithic structure with deflection means is used, then polarization control and wavelength filtering are achieved, but the manufacturing complexity increases
Solution Approach 1:
The laser cavity is divided into manufacturable sections with distinct refractive indices (n1, n2, n3), where each section can be fabricated using appropriate materials and then assembled. This segmentation approach allows for standardized manufacturing processes for each section while achieving the complex optical functionality of the overall device.
Solution Approach 2:
The laser cavity employs composite materials with different refractive indices arranged in specific sections. This use of composite materials enables the realization of different optical properties in different regions of the chip, facilitating polarization control and wavelength filtering while allowing each material section to be manufactured using techniques appropriate to its specific requirements.
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
Enables the generation of short pulse durations (less than 5 nanoseconds) while allowing for the selection of polarization, improving stability and enabling efficient wavelength conversion, unlike existing monolithic or semi-monolithic chip lasers.
Implementation Method 1
the deflection means comprising at least one deflection surface in contact with the separation medium so as to deflect the beam luminous when it crosses the deflection surface
Implementation Method 2
the or each surface is inclined with respect to the direction of propagation of the laser beam according to the Brewster angle
Implementation Method 3
a saturable absorbing medium placed in the cavity... a saturable absorbent medium is only transparent beyond an intensity threshold corresponding to the bleaching of the medium
Implementation Method 4
an amplifying laser medium intended to amplify a pump beam
Data Source
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AI summary
The invention relates to a passively triggered microchip laser (1) formed by a cavity closed by an input mirror (4) and an output mirror (5), characterized in that the cavity includes deflection means (9, 10, 11, 12, 13) designed to deflect a light beam (14) between the input mirror (4) and the output mirror (5).