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| Coad | 664051 | Type | Galilean Apochromatic Fixed Magnification Beam Expander | |
| Shell Input/Output Diameter（mm） | 30.5 / 56.2 | Shell Length（mm） | 121.00 | |
| Wavelength(nm) | 1100 - 1650 | Magnification(X) | 5 | |
| Material | - | Housing Material | - | |
| Incident Clear Aperture | 11.0mm | Exit Clear Aperture | 47.5mm | |
| Incident and Exit Light Angle | - | Output Beam Spot Diameter | - | |
| Maximum Incident Beam Spot Diameter | - | Thread Size | SM1 External Thread / SM2 Internal Thread | |
| Thread Adjustable Distance | ±4.2mm | Input End Thread Distance | 3.0mm | |
| Spot Size at Diffraction Limit (a) | 5.0mm | Focusing Distance | ±2.5m | |
| Collimation | - | Transmittance | ＞96%@1064nm；＞97%@1310nm；＞97%@1550nm | |
| Surface Quality | - | Transmission Wavefront Deviation | - | |
| Laser Damage Threshold | 3J/cm²(1542nm，10ns，1Hz，Ø268µm) | System Damage Threshold | - | |
| Coating Specifications | Ravg<0.5%@1100-1650nm | |||
LBTEK Achromatic Fixed Magnification Beam Expander (FBE) is an optical system based on a Galilean telescope structure that can expand (or compress) the diameter of a parallel incident beam to a fixed magnification. Using a low-aberration achromatic design and optimized for performance, it provides a transmission wavefront deviation of less than λ/4 and minimizes the impact on the beam's M² value during expansion. Each beam expander is equipped with thread adapters, making it easy to pair with LBTEK lens tubes and other optical components. LBTEK also offers various customization services, including custom sizes, operating wavelengths, expansion magnifications, and other specifications. Please contact us for custom requirements.
LBTEK Achromatic Fixed Magnification Beam Expander is based on a Galilean telescope design and consists of a set of high-transparency negative lenses and achromatic doublet positive lenses. It can expand or compress the diameter of a parallel incident beam within the operating wavelength range to a fixed magnification. The transmission wavefront deviation after expansion/compression is less than λ/4, with minimal aberration and little impact on the beam quality. The adjustment ring on the waist section is used to adjust the divergence angle of the output beam, accommodating the needs for non-collinear beam expansion. During the rotation of the adjustment ring, due to a special mechanical design, the internal lenses only move axially and do not rotate with the mechanical ring. This design effectively reduces beam position shifts during divergence angle adjustment, ensuring more stable and reliable performance of the beam expander. The input and output ends are designed with different thread specifications, and the waist section can be mounted using a clamping mechanism.
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