Slow Axis Collimation(SAC) Cylindrical Lens Array Overview

Slow Axis Collimation (SAC) Cylindrical Lens Array is an optical component that arranges multiple cylindrical lens units on a single substrate. It simultaneously collimates light beams from multiple diode light points along the slow axis. Each lens unit can be precisely aligned with a light point on the laser bar, enabling individual collimation of light emitted from each light point by its corresponding lens unit.Coligh specializes in manufacturing Slow Axis Collimation (SAC) Cylindrical Lens Arrays. SAC lens arrays are typically used in combination with FAC microlens arrays.

Slow Axis Collimation(SAC) Cylindrical Lens Array Features

Our Slow Axis Collimation (SAC) Cylindrical Lens Array features the following characteristics:

• Our SAC lens array utilizes precision cylindrical lens units to compress the slow-axis divergence angle and collimate the light spot along the slow-axis direction, delivering a smaller spot size and improved beam stacking.
• A single cylindrical lens incorporates dozens or even hundreds of microlenses, enabling simultaneous collimation of all light-emitting points.
• We primarily utilize fused silica as the material, which possesses a low thermal expansion coefficient and a high optical damage threshold. Additionally, we customize anti-reflective coatings with laser damage thresholds tailored to specific laser wavelengths. This ensures the lenses remain stable and function reliably in high-power laser environments over extended periods.
• We can customize the parameters of the SAC lens array—such as focal length, aperture, and array length—based on the specifications of the laser bar.

The Guidance On How To Custom Slow Axis Collimation(SAC) Cylindrical Lens

When customizing a Slow Axis Collimation (SAC) cylindrical lens, please consider the following key parameters and options:

• Focal length: Required collimation and working distance
• Lens pitch
• Numerical aperture
• Array length and number of elements
• Substrate dimensions (length, width, thickness) and profile
• Substrate material: Fused silica, optical glass, or other materials
• Anti-reflective coating wavelength range
• Required laser damage threshold

We can customize optical designs, material selections, and coating solutions according to your requirements.

Slow Axis Collimation(SAC) Cylindrical Lens Array Applications

• Fiber Laser Pumping
  Fiber laser pumping represents the largest demand for SAC lens arrays and constitutes one of the most critical optical components within pump modules. The SAC lens array is positioned directly in front of the laser pump beam, collimating the slow-axis light into parallel rays. This effective slow-axis collimation enhances the fiber’s optical power, achieving higher output efficiency and superior beam quality.
• Direct Semiconductor Laser
  SAC lens arrays form the foundation of direct semiconductor laser systems. They first collimate the slow-axis beam, which then passes through a fast-axis collimator. Using beam transformers and focusing lenses along the slow-axis direction, they generate a high-energy-density square or circular spot, enabling direct semiconductor lasers to perform welding and material processing.
• LiDAR
  Vehicle-mounted LiDAR requires a light source capable of illuminating the entire field of view simultaneously. However, the large divergence angle along the slow axis causes uneven brightness across the illuminated area, limiting detection range. The SAC lens array collimates the light source along the slow axis, forming a narrower, more concentrated illumination spot.