Optimal lens design and use in laser-scanning microscopy.

Area of Science:

• Optical microscopy
• Microscope instrumentation

Background:

• Standard achromatic doublets in laser-scanning microscopy limit the diffraction-limited field-of-view (FOV) and introduce scan-angle-dependent chromatic aberrations.
• This compromises imaging quality, particularly for high-NA objectives.

Purpose of the Study:

• To design and implement simple, superior-quality custom lenses for laser-scanning microscopy.
• To fully utilize high-NA, low-magnification objectives for enhanced imaging performance.

Main Methods:

• Developed several simple lens designs optimized for large FOV and wide wavelength ranges.
• Constructed a two-photon laser-scanning microscope incorporating these custom lenses.

Main Results:

• Achieved near diffraction-limited imaging performance across a 400 µm FOV.
• Demonstrated minimal point-spread-function (PSF) variation (<3.6%) over the FOV.
• Reduced lateral color to <0.5 µm between 750 and 1050 nm.

Conclusions:

• Custom-designed lenses significantly outperform off-the-shelf achromatic doublets in laser-scanning microscopy.
• These optimized lenses enable high-quality, diffraction-limited imaging over large fields of view and broad wavelength ranges.