Chromatic aberration free reflective mirror-based optical system design for multispectral photoacoustic instruments

Abstract

BACKGROUND: Current multispectral photoacoustic instruments must use large and separate combinational structures to obtain various biological tissue information for multispectral ranges. OBJECTIVE: The optical aberration generated from the multispectral photoacoustic systems may reduce the image quality of biological tissue because the improper structures for combining light of different wavelength cannot produce good optical ray convergence points. To prevent this, complex combined structures need to be considered at the design level for multispectral photoacoustic systems. METHODS: In place of an optical refracted lens system, reflective mirrors could be designed for optical systems. To verify our proposed idea, we assessed optical distortion performance using red, green, and blue light, and combined optical light sources to compare their chromatic aberration characteristics. RESULTS: The high optical performance is realized regardless of the wavelength for a light source combined with multiple wavelengths, because our optical system was designed with only a reflective surface. CONCLUSIONS: The designed optical system using a reflective mirror can provide multispectral optical sources (such as infrared, visible, and ultraviolet optical lights) with only one light ray path, without any chromatic aberrations.

Computation of Analytical Zoom Locus Using Padé Approximation

“…Subsequently, Equations (8)- (10) are calculated in further detail. Using the characteristics of the Gaussian bracket, the unknown k i is exported out of the Gaussian bracket and written as the first equation for k i [24][25][26][27].…”

Design of Wide Angle and Large Aperture Optical System with Inner Focus for Compact System Camera Applications

“…where SI represents the coefficient of the spherical aberration of the Seidel aberration coefficient, the subscript total represents the Seidel aberration coefficient including the aspherical surface, n represents the refractive index immediately before the refracting surface, n' represents the refractive index of the refracting surface, y is the height of the axial ray of the refracting surface, SII, SIII, and SV are the coma aberration, astigmatism, and distortion aberration, and ȳ represents the principal ray height at the corresponding refracting surface. Moreover, as the aspherical surface becomes larger, the material and processing cost increase [18]. Therefore, the 18th surface was selected as the aspherical surface to correct spherical aberration considering both the correction effect and the processing cost.…”

“…As shown in Table 3 line (d), while the SAA is 1.1 mm and SAT is not identical to the secondary correction, the spot size of the on-axis is the smallest. The third order spherical aberration of the synthesized optical system was corrected and Moreover, as the aspherical surface becomes larger, the material and processing cost increase [18]. Therefore, the 18th surface was selected as the aspherical surface to correct spherical aberration considering both the correction effect and the processing cost.…”

A color correction method to minimize lateral chromatic aberration in spherical lens stacks

“…The foci of the output rays deviate from the optical axis, and they fail to focus on a common point in the focal plane. 10 As a consequence of this aberration, color fringes constituting the three distinct primary colors are clearly seen at the edges of an image. In general, lateral chromatic aberration tends to be more severe in comparison to its longitudinal counterpart.…”