What is the difference between BBO and LBO?

Properties and Characteristics of BBO Crystal

BBO crystal, also known as β-BaB2O4, is a nonlinear optical crystal with excellent transparency over a broad wavelength range. Its key properties include high damage threshold, wide phase-matching range, and large effective nonlinear coefficients. BBO crystals possess a high optical homogeneity, making them suitable for applications requiring high laser power handling capabilities. Due to their high nonlinear coefficients, BBO crystals are extensively used in frequency conversion processes such as second-harmonic generation (SHG) and parametric oscillation.

One of the unique properties of BBO crystals is their wide transparency range(190nm-3500nm), covering visible, near-infrared, and mid-infrared wavelengths. They are highly resistant to photo refractive damage, making them suitable for high-power laser applications. Additionally, BBO crystals exhibit a relatively low walk-off angle, enabling efficient phase matching for various nonlinear optical processes.

Properties and Characteristics of LBO Crystal

LBO crystal, or Lithium Triborate (LiB3O5), is another popular nonlinear optical crystal known for its excellent optical properties. It offers a broad phase-matching range, high damage threshold, and large effective nonlinear coefficients, similar to BBO crystals. LBO crystals are particularly valued for their high conversion efficiency and low optical loss, making them ideal for applications requiring high energy conversion.

With high UV transparency (160nm—2600nm range of transparency), LBO crystals are particularly useful for ultraviolet (UV) and deep-ultraviolet (DUV) applications. They exhibit low absorption and low scatter in the UV range, enabling efficient frequency conversion. LBO crystals also have a wide temperature acceptance bandwidth, allowing them to maintain phase matching in a range of temperatures.

Applications and Suitability of BBO and LBO Crystals

BBO and LBO crystals find extensive applications in various fields due to their excellent optical properties. BBO crystals are commonly used in frequency doubling and mixing of laser sources, as well as in optical parametric oscillators (OPOs) and harmonic generators. They are also employed in quantum optics, medical diagnostics, and telecommunications.

On the other hand, LBO crystals are widely utilized in applications such as frequency doubling of diode lasers, optical parametric amplifiers (OPAs), and optical wave mixing. Their broad transparency range and high conversion efficiency make them suitable for high-power laser systems, medical imaging, and spectroscopy.

When choosing between BBO and LBO crystals, it is essential to consider factors such as the desired wavelength range, power requirements, and environmental conditions. LBO crystals excel in UV and DUV applications, while BBO crystals offer a broader transparency range. The specific requirements of your application will determine which crystal is the most suitable choice.

In conclusion, BBO and LBO crystals are both valuable nonlinear optical materials with distinct properties and applications. Understanding the differences between these crystals is crucial for selecting the optimal solution for your specific needs. Whether you require efficient frequency conversion, high power-handling capabilities, or a broad transparency range, BBO and LBO crystals offer reliable solutions for a wide range of optical applications.