Ga2Se3 Nonlinear Crystal for Mid-Infrared Frequency Conversion
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Solution Overview
Problem
Current mid- and far-infrared nonlinear optical crystals, such as AgGaS2 and AgGaSe2, have limitations including low laser damage threshold and difficulties in growing large crystals, which do not meet the increasing demands for comprehensive performance in applications like infrared detectors and lasers.
Innovation Solution
A new nonlinear optical crystal material with the molecular formula Ga2Se3 is developed, exhibiting enhanced frequency-doubling intensity and laser damage threshold, achieved through a high-temperature solid-state method using a fluxing agent, and applied in devices like optical parametric oscillators and second harmonic generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercial mid-/far-infrared nonlinear optical crystals (AgGaS2, AgGaSe2, ZnGeP2) are used, then frequency conversion functionality is achieved, but laser damage threshold is low
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a new crystal material Ga2Se3 with different stoichiometric ratios and crystal structure parameters, achieving both high laser damage threshold and excellent nonlinear optical performance simultaneously
Solution Approach 2:
The patent develops composite crystal structures by forming Ga2Se3 crystals with specific lattice parameters and GaSe4 tetrahedral networks, creating a composite material that combines high damage threshold with superior frequency conversion efficiency
2Volume of stationary object
If commercial nonlinear optical crystals are used, then frequency conversion is achieved, but large crystal growth is difficult
Solution Approach 1:
The patent optimizes crystal growth parameters including temperature gradients, pressure conditions, and compositional ratios to enable growth of large Ga2Se3 crystals with dimensions suitable for practical applications while maintaining high crystal quality
Solution Approach 2:
The patent uses fluxing agents as intermediaries during the crystal growth process to facilitate the formation of large Ga2Se3 crystals, where the fluxing agent mediates the crystallization process and enables growth of larger crystal sizes than would be possible through direct solid-state reaction alone
3Adaptability or versatility
If existing infrared nonlinear optical crystals are used, then application in infrared detectors and lasers is possible, but comprehensive performance does not meet increasing demands
Solution Approach 1:
The patent modifies the material composition parameters by developing Ga2Se3 crystals with optimized stoichiometry and crystal structure, achieving enhanced nonlinear optical coefficients and broader infrared transmission range to meet diverse application requirements
Solution Approach 2:
The patent creates a universal crystal material Ga2Se3 that can be applied across multiple infrared applications including frequency doubling, sum frequency generation, difference frequency generation, and optical parametric oscillation, replacing the need for multiple different crystal 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 Ga2Se3 crystal material demonstrates superior infrared nonlinear optical performance, with frequency-doubling intensity 9.3 times that of AgGaS2 and a laser damage threshold 7.5 times higher, enabling effective use in frequency converters and other infrared applications.
Implementation Method 1
frequency-doubling intensity can reach 9.3 times of AgGaS2
Implementation Method 2
A gallium atom connects with four selenium atoms to form a GaSe4 tetrahedron, and GaSe4 tetrahedral share corners to form three-dimensional network structure
Implementation Method 3
after homogeneously mixing raw materials containing gallium, boron and selenium with a fluxing agent, said nonlinear optical crystal material is obtained using high temperature solid state method under a vacuum condition
Data Source
AI summary
The present application discloses a nonlinear optical crystal material, preparation method and application of the nonlinear optical crystal material. A nonlinear optical crystal material, whose molecular formula is Ga2Se3; wherein the crystal structure of said nonlinear optical crystal material belongs to trigonal system, space group R3 with the lattice parameters of a=b=3˜4.2 Å, c=9˜10 Å, α=β=90°, γ=120° and Z=1. The nonlinear optical crystal material has an excellent infrared nonlinear optical performance, whose frequency-doubling intensity can reach 9.3 times of AgGaS2 with the same particle size, and it meets type-I phase matching; and its laser damage threshold can reach 7.5 times of AgGaS2 with the same particle size. The nonlinear optical crystal material has important application value in the frequency-converters which can be used for frequency doubling, sum frequency, difference frequency, optical parametric oscillation of laser in mid and far infrared waveband, and the like.