Ce4+-Yb3+ Doped Self-Frequency-Doubling Crystal for Stable Yellow Laser Output

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Solution Overview

Problem

Existing yellow laser line projectors using Yb:YCOB self-frequency-doubling crystals exhibit unstable and low light output power during the initial operation period, requiring time to stabilize.

Innovation Solution

A self-frequency-doubling yellow crystal doped with tetravalent cerium ions (Ce4+) at 0.1% ~ 12% and trivalent ytterbium ions (Yb3+) at 1% ~ 40% is used, maintaining stable light output power without significant attenuation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Yb:YCOB self-frequency-doubling crystal is used in yellow laser line projector, then yellow light output is generated, but light output power is unstable and low during initial operation period

Engineering Contradiction:

Improvelight output power stabilityVSAvoidyellow light output power

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent modifies the chemical composition parameters of the laser crystal by introducing tetravalent cerium ions (Ce4+) as a dopant alongside trivalent ytterbium ions (Yb3+). This parameter change in the crystal's doping composition resolves the instability and low power issues during initial operation, enabling the crystal to maintain stable and high yellow light output power from the start of operation.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If Yb:YCOB self-frequency-doubling crystal is used, then yellow laser light is generated, but light output power significantly decreases during operation

Engineering Contradiction:

Improveyellow light output powerVSAvoidoperational duration with stable power

Core Design Contradiction:

Illumination intensityVSDuration of action of moving object

Solution Approach 1:

The patent creates a composite-doped laser crystal by combining tetravalent cerium ions (Ce4+) and trivalent ytterbium ions (Yb3+) within the YCOB crystal structure. This composite doping approach produces a crystal that maintains stable yellow light output power throughout extended operation, preventing the significant power decrease observed in conventional single-doped crystals.

Inventive Principle:

Principle #40Composite materials

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 crystal maintains high yellow light output power without significant decrease within the first 60 seconds of operation and throughout, enhancing luminous efficiency and reducing energy consumption.

Implementation Method 1

a self-frequency-doubling yellow crystal doped with tetravalent cerium ions (Ce4+) and trivalent ytterbium ions (Yb3+)

Methodology Applied

Scientific EffectStimulated emission: Laser

Implementation Method 2

self-frequency-doubling yellow crystal

Methodology Applied

Scientific EffectFrequency doubling: Second Harmonic Generation

Data Source

PatentEP4585727A1Yellow light self-frequency doubling crystal and yellow light self-frequency doubling laser

Publication Date: 2025.07.16 QINGDAO LASENCE GRP CO LTD

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AI summary

A yellow light self-frequency doubling crystal and a yellow light self-frequency doubling laser comprising the yellow light self-frequency doubling crystal, as well as a laser light source and a focusing or light transmission component. The yellow light self-frequency doubling crystal is a crystal doped with tetravalent cerium ions and trivalent ytterbium ions, the doping concentration of Ce4+being 0.1% to 12%, and the doping con- centration of Yb3+ being 1% to 40%.