Designed for high-performance near-infrared imaging, the CLS-F18 scan lens operates over a wavelength range of 1250–1380 nm and features an effective focal length of 18 mm. It has an entrance pupil diameter of 4 mm, with an entrance pupil position located 11.7 mm from the lens. The lens supports a maximum single-axis scan angle of ±10.6°, delivering a field of view of 4.7×4.7 mm and a diffraction-limited region of 4.2×4.2 mm. With a working distance of 7.5 mm, the CLS-F18 offers ample clearance for sample placement and flexible system integration.

This scan lens is particularly well-suited for three-photon excitation laser scanning microscopy, enabling deep-tissue near-infrared imaging with exceptional clarity. Its anti-reflection coating, optimized for the 1250–1380 nm band, ensures high transmission efficiency in high-power laser point-scanning imaging systems while minimizing thermal effects for stable, long-term operation. The lens is equipped with an external M25×0.75 mounting thread, allowing easy integration into mainstream optical systems via adapters such as the SM1A12 (SM1 threading) or RMSA2 (for RMS threading), ensuring broad compatibility and straightforward installation.

For applications requiring precise dispersion control, such as optical coherence tomography (OCT), the CLS-F18 can be paired with the dedicated CLS-F18-DC dispersion compensator to further enhance axial resolution and image contrast. Overall, the CLS-F18 scan lens combines a wide field of view, high transmittance, and deep-tissue imaging capability, making it an ideal choice for near-infrared multiphoton and laser scanning imaging systems.