Harmonic Generator Waveguide with Segmented Emission Surface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing harmonic wave oscillating systems using optical waveguide-type wavelength conversion devices are difficult to miniaturize due to the need for large, long-focal-length lenses, which also degrade the quality of the light beam by scattering unnecessary light, leading to instability and noise in the oscillation.
Innovation Solution
The system employs a waveguide-type harmonic wave oscillating device with polished and light scattering surfaces at obtuse or right angles, allowing for the use of smaller lenses, preventing reflected light, and efficiently condensing only the desired harmonic wave, thereby miniaturizing the system and improving beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the incident and emitting faces of the optical waveguide substrate are polished to be inclined to prevent reflected light, then the oscillation stability is improved, but the lens cannot be positioned near the substrate, requiring large size and long focal length lenses which prevents system miniaturization
Solution Approach 1:
The emitting-side end face is divided into two distinct surfaces: a polished surface on the first side face and a light scattering surface on the second side face. This segmentation allows the polished surface to prevent reflected light from entering the laser oscillator (improving stability) while the light scattering surface enables compact lens positioning (reducing system size).
Solution Approach 2:
Different regions of the emitting-side end face are given different optical properties: the polished surface provides reflective control while the light scattering surface provides scattering control. This local differentiation of surface properties allows simultaneous achievement of oscillation stability and compact lens positioning.
2Reliability
If large size lenses with long focal length are used to accommodate the inclined polished faces, then the reflected light is prevented from entering the laser oscillator, but the lens receives scattered light from the slab part which deteriorates the light beam quality
Solution Approach 1:
The emitting-side end face is segmented into a polished surface and a light scattering surface, allowing the system to selectively manage different light paths. The light scattering surface scatters light from the slab part away from the lens axis, preventing it from entering the lens and degrading beam quality, while the polished surface maintains oscillation stability.
Solution Approach 2:
The harmful scattered light from the slab part is extracted and redirected away from the optical path by the light scattering surface. This prevents the scattered light from entering the lens and degrading the beam quality, while maintaining the beneficial effects of the inclined polished surface.
3Reliability
If the lens is positioned far from the optical waveguide substrate to accommodate the inclined polished faces, then the reflected light is prevented from entering the laser oscillator, but the system cannot be miniaturized
Solution Approach 1:
The emitting-side end face is segmented into two functional surfaces that work together to resolve the spatial conflict. The polished surface handles reflected light prevention while the light scattering surface enables short focal length lens positioning, allowing compact optical path length while maintaining oscillation stability.
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 configuration enables the miniaturization of the harmonic wave oscillating system, stabilizes the oscillation, and reduces noise by using smaller lenses positioned near the light scattering surface, resulting in a more efficient and high-quality harmonic wave beam.
Implementation Method 1
a light scattering surface formed on the side of the second side face... the lens receives light radiated from a slab part of the optical waveguide substrate and scattered light
Implementation Method 2
a first lens system condensing the laser light oscillated from the solid-state laser oscillator to the incident-side end face
Implementation Method 3
a second lens system condensing the harmonic wave emitted from the emitting-side end face
Implementation Method 4
a waveguide-type harmonic wave oscillating device comprising a converting waveguide converting a wavelength of a laser light oscillated from the solid-state laser oscillator to oscillate a harmonic wave
Data Source
AI summary
A harmonic wave oscillating system includes a solid-state laser oscillator, a converting waveguide converting a wavelength of a laser light oscillated from the solid-state laser oscillator to oscillate a harmonic wave, an incident-side end face of the laser light, an emitting-side end face of the harmonic wave, a first side face and a second side face. The emitting-side end face includes a polished surface 6 formed on the side of the first side face 1a and a light scattering surface formed on the side of the second side face 1b. The first side face 1a and polished surface 6 are intersected at an obtuse angle θ, and the second side face 1b and light scattering surface 5 are intersected at an obtuse or right angle α.