Scattering-Cavity Non-Resonant Laser for Efficient Directional Output

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Solution Overview

Problem

Non-resonant lasers suffer from low energy efficiency and low light directionality due to significant light loss and diffusion, limiting their applications and spatial coherence.

Innovation Solution

A high-efficiency and directional non-resonant laser design incorporating a scattering cavity with a gain medium unit and a pumping and supply unit, where the scattering cavity is shaped to contain light effectively, enhancing energy efficiency and directionality through controlled reflection and amplification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a scatterer is added to construct non-resonance feedback, then various gain media including opaque materials can be used, but light loss increases and energy efficiency decreases

Engineering Contradiction:

Improvegain media selectionVSAvoidlight loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The laser cavity is segmented into multiple scattering centers distributed throughout the gain medium, rather than using a single scatterer. This segmentation allows light to undergo multiple scattering events while maintaining feedback, reducing the need for strong individual scatterers that would cause excessive light loss.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cavity have different scattering properties. The scattering centers are strategically positioned and sized to provide appropriate scattering strength in different locations, optimizing the balance between feedback and light loss while allowing various gain media to be used.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If a scatterer is added to construct non-resonance feedback, then non-resonant laser operation is achieved, but light directionality deteriorates due to diffusion in all directions

Engineering Contradiction:

Improvelaser operation modeVSAvoidlight directionality

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The scattering centers are designed with asymmetric properties or are positioned asymmetrically within the cavity to preferentially scatter light in certain directions. This asymmetry maintains the non-resonant feedback mechanism while reducing isotropic diffusion and preserving beam directionality.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The problem of light directionality is addressed by introducing spatial dimensionality considerations in the scattering center distribution. By controlling the three-dimensional arrangement and optical properties of scattering centers, the system achieves directional emission while maintaining non-resonant operation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If a scatterer is added to construct non-resonance feedback, then opaque gain media can be used, but spatial coherence decreases

Engineering Contradiction:

Improvegain medium typeVSAvoidspatial coherence

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

Multiple distributed scattering centers act as intermediaries that mediate between the opaque gain medium and the output beam. These scattering centers provide the necessary feedback while maintaining spatial coherence by creating a distributed feedback mechanism that preserves wavefront quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design achieves high energy efficiency and directional light emission, enabling the use of opaque gain media and expanding laser applications to new wavelength regions without requiring crystallization processes.

Implementation Method 1

a scattering cavity and an entrance communicating with the scattering cavity are provided

Methodology Applied

Scientific EffectScattering: Scattering

Implementation Method 2

enhancing energy efficiency and directionality through controlled reflection and amplification

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

The gain medium unit may be excited by the pumping light on the inside of the scattering cavity, and may output emission light through the entrance

Methodology Applied

Scientific EffectStimulated emission: Laser

Data Source

PatentUS12374850B2High-efficiency and directional non-resonant laser using scattering cavity and method of manufacturing the same

Publication Date: 2025.07.29 KOREA ADVANCED INST OF SCI & TECH

AI summary

Various embodiments provide a high-efficiency and directional non-resonant laser using a scattering cavity and a method of manufacturing the same. According to various embodiments, the non-resonant laser may include a gain medium unit in which a scattering cavity and an entrance communicating with the scattering cavity are provided, and a pumping and supply unit configured to supply pumping light to an inside of the scattering cavity. The gain medium unit may be implemented to be excited by the pumping light on the inside of the scattering cavity and to output emission light through the entrance. According to various embodiments, the gain medium unit may weaken the pumping light while reflecting the pumping light on the inside of the scattering cavity, and may amplify the emission light while reflecting the emission light on the inside of the scattering cavity.