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}  } 

Nonlinear optical crystals play a critical role in modern laser technology, especially in frequency conversion applications. Among them, LBO (Lithium Triborate) crystals stand out due to their excellent optical and physical properties, making them an ideal choice for generating 355nm UV lasers. This article explores the advantages and implementation of LBO nonlinear crystal in the 355nm UV wavelength range.

What is an LBO Nonlinear Crystal?

LBO is a nonlinear optical crystal with a broad transmission range (160nm to 2600nm) and a high optical damage threshold. Its main features include:

High Optical Damage Threshold: LBO surpasses other crystals like BBO with a threshold of approximately 36.3 GW/cm², making it suitable for high-power laser applications.
Wide Transparency Range: High transmittance across UV to mid-infrared wavelengths.
Low Walk-Off Angle: Minimizes beam displacement during frequency conversion, improving conversion efficiency.
Excellent Mechanical and Chemical Stability: Ensures durability in harsh operating environments.

LBO Nonlinear Crystal — Fig.1 Crylink produces large-size blanks of LBO nonlinear crystals

Why Choose 355nm UV Lasers?

355nm UV lasers, generated via third harmonic generation (THG), are created by frequency-doubling near-infrared wavelengths (typically 1064nm) followed by sum-frequency generation. UV lasers at this wavelength offer several unique advantages:

High Photon Energy: Suitable for precision machining and material surface processing.
Small Focus Area: Enhances machining accuracy, ideal for cutting brittle materials such as sapphire, glass, and silicon wafers.
Versatile Industrial and Scientific Applications: Used in laser etching, precision optical component manufacturing, and surface physics experiments.

Applications of LBO Nonlinear Crystals in 355nm Frequency Conversion

LBO crystals enable efficient conversion to 355nm UV lasers through second harmonic generation (SHG) and third harmonic generation (THG). Research demonstrates that LBO crystals achieve high conversion efficiency in these processes.

Principles of SHG and THG

Second Harmonic Generation (SHG):

SHG, 1064 nm + 1064 nm → 532 nm — Fig.2 Schematic of LBO nonlinear crystal SHG

Converts 1064nm fundamental light into 532nm green light.
Achieved using a 4mm-long Type I phase-matched LBO crystal (cut angles q=90°, j=11.6°).
In experiments, it achieved 54.7% optical-to-optical conversion efficiency, producing 12.7W of 532nm laser output.

Third Harmonic Generation (THG):

Combines 532nm green light with residual 1064nm fundamental light to generate 355nm UV light.
Performed using a 3mm-long Type II phase-matched LBO crystal (cut angles q=42.2°, j=90°).
Demonstrated 39.8% conversion efficiency, yielding 9.25W of 355nm laser output.

Key Factors for Optimization

Phase Matching: Optimize the crystal cut angles to ensure phase matching of the fundamental, second harmonic, and third harmonic beams.
Crystal Length: Balance walk-off effects by selecting the appropriate crystal length to minimize energy loss.
Focused Beam Input: Adjust laser focus for optimal power density, enhancing frequency conversion efficiency.

Advantages of LBO Nonlinear Crystals in the 355nm UV Range

High Conversion Efficiency: Experiments confirm that LBO crystals provide stable and efficient THG conversion, meeting industrial and research needs.
Low Thermal Effects: LBO crystals exhibit low absorption, reducing thermal effects compared to other nonlinear crystals.
Superior Durability: The high optical damage threshold and excellent mechanical and chemical stability make LBO crystals ideal for high-power laser applications.

Practical Applications of 355nm UV Lasers

Precision Micromachining: Processing transparent materials like sapphire and glass, used in electronics and optical component manufacturing.
Laser Etching: High-precision engraving and cutting for semiconductors and printed circuit boards.
Scientific Research: Stimulating unique optical phenomena in surface physics experiments and spectroscopy studies.

Conclusion

LBO nonlinear crystals provide reliable and efficient solutions for generating 355nm UV lasers, serving a wide range of industrial and scientific applications. Their high optical damage threshold, minimal walk-off effects, and excellent phase-matching capabilities make them a top choice for frequency conversion processes. These crystals are particularly well-suited for high-power laser systems, ensuring stable performance and long-term durability.

With optimized design and careful application, LBO crystals excel in diverse areas such as laser micromachining, precision optical manufacturing, and advanced material research. Their versatility and efficiency have made them a cornerstone in applications requiring high-performance UV lasers, driving innovation across industries and research domains.

Frank

Frank graduated from the University of Shanghai for Science and Technology, majoring in optics. As a technical engineer at Crylink Company, he deeply understands crystal materials and laser components.