Eyepiece Design

Kingslake, R.; Johnson, R. Barry

doi:10.1016/b978-0-12-374301-5.00020-6

Cited by 20 publications

(39 citation statements)

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“…Therefore, we should resolve the non-linear simultaneous equations about the curvature, thickness, and refractive index of the lens material in order to minimize residual aberrations. The process to solve these complex non-linear equations is called the optimization [34]. In Figure 3, the designed double-Gauss lens should be compensated for chromatic aberration such that we can design and optimize a high-performance lens with minimal aberration, thus producing uniform light beam intensity in the area of interest.…”

Section: Methodsmentioning

confidence: 99%

Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications

Choi

Ryu

Yeom

2017

Sensors

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In optoacoustic (photoacoustic) systems, different echo signal intensities such as amplitudes, center frequencies, and bandwidths need to be compensated by utilizing variable gain or time-gain compensation amplifiers. However, such electronic components can increase system complexities and signal noise levels. In this paper, we introduce a double-Gauss lens to generate a large field of view with uniform light intensity due to the low chromatic aberrations of the lens, thus obtaining uniform echo signal intensities across the field of view of the optoacoustic system. In order to validate the uniformity of the echo signal intensities in the system, an in-house transducer was placed at various positions above a tissue sample and echo signals were measured and compared with each other. The custom designed double-Gauss lens demonstrated negligible light intensity variation (±1.5%) across the illumination field of view (~2 cm diameter). When the transducer was used to measure echo signal from an eye of a bigeye tuna within a range of ±1 cm, the peak-to-peak amplitude, center frequency, and their −6 dB bandwidth variations were less than 2 mV, 1 MHz, and 6%, respectively. The custom designed double-Gauss lens can provide uniform light beam across a wide area while generating insignificant echo signal variations, and thus can lower the burden of the receiving electronics or signal processing in the optoacoustic system.

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Section: Methodsmentioning

confidence: 99%

Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications

Choi

Ryu

Yeom

2017

Sensors

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“…Slight curvature across the plane is often encountered, even with the aid of advanced lens design software [39]. Element misalignment during system assembly will additionally shift the Fourier plane away from its ideal location.…”

Section: Characterization and Removal Of Geometric Distortionmentioning

confidence: 99%

Overlapped Fourier coding for optical aberration removal

Horstmeyer¹,

Ou²,

Chung³

et al. 2014

Opt. Express

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We present an imaging procedure that simultaneously optimizes a camera's resolution and retrieves a sample's phase over a sequence of snapshots. The technique, termed overlapped Fourier coding (OFC), first digitally pans a small aperture across a camera's pupil plane with a spatial light modulator. At each aperture location, a unique image is acquired. The OFC algorithm then fuses these low-resolution images into a full-resolution estimate of the complex optical field incident upon the detector. Simultaneously, the algorithm utilizes redundancies within the acquired dataset to computationally estimate and remove unknown optical aberrations and system misalignments via simulated annealing. The result is an imaging system that can computationally overcome its optical imperfections to offer enhanced resolution, at the expense of taking multiple snapshots over time.

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“…광학계의 특성은 파장에 따라 변화하기 때문에 사용하는 파장 대역에 맞추어 몰색화 설계를 하게 된다. 2매 구성 광 학계의 몰색화는 2개의 파장에 대하여 굴절능을 일치시키는 achromat이 일반적이며 [2][3][4] , 용도에 따라 특정 파장을 기준으 로 파장 변화에 따른 굴절능의 변화가 없도록 하는 안정화 광학설계도 발표된바 있다 [5] . Achromat은 가시광선 대역에서 적정한 수준으로 색수차를 보정하는 매우 유용한 설계이나 secondary spectrum을 줄이기 위하여서는 고가의 이상분산유 리가 사용되어야 하는 문제점이 있다 [2] .…”

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Optical Design of a Collimator Lens That Is Very Stable Against Chromatic Variation

Lee¹,

Lee²

2017

Korean Journal of Optics and Photonics

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To minimize chromatic variations across a wavelength band, we suggest a new design that corrects the first-and second-order wavelength derivatives of the refractive power. Based on this method, a diffraction-limited collimator is designed. The design is very stable against wavelength change, as expected. The chromatic change of the effective focal length is less than 0.002% in the wavelength range from 360 to 410 nm. . 특히 정밀도가 높은 시준기에는 3종의 광학유리를 조합하여 색수차를 보정한 apochromat이 이용되 기도 한다. 이 연구에서는 3종 이상의 광학유리를 조합하지 않고도 2 종의 광학유리로 특정한 범위의 파장 대역에서 종색수차가 매우 잘 보정된 렌즈를 설계하는 방법을 연구하였다. 광학계의 특성은 파장에 따라 변화하기 때문에 사용하는 파장 대역에 맞추어 몰색화 설계를 하게 된다. 2매 구성 광 학계의 몰색화는 2개의 파장에 대하여 굴절능을 일치시키는 achromat이 일반적이며 [2][3][4] , 용도에 따라 특정 파장을 기준으 로 파장 변화에 따른 굴절능의 변화가 없도록 하는 안정화 광학설계도 발표된바 있다 [5] . Achromat은 가시광선 대역에서 적정한 수준으로 색수차를 보정하는 매우 유용한 설계이나 secondary spectrum을 줄이기 위하여서는 고가의 이상분산유 리가 사용되어야 하는 문제점이 있다 [2] . 그리고 특정 파장에 대한 안정화 설계는 가격이 낮은 정상분산유리를 사용하여 도 기준 파장과 그 인근에서는 색수차가 거의 없으나 색수차 가 잘 보정된 파장 대역이 좁은 한계가 있다. 이 연구에서는 기존의 안정화 설계를 보다 개선하여 2매 구성 광학계에서 파장변화에 따른 굴절능의 변화를 1차, 2차 미분까지 보정하 는 설계방법을 제안하고자 한다. 새로 제안된 설계 방법은 기준파장과 인근 대역에서 Δλ의 3제곱에 비례하여 굴절능 이 변화하고 보통의 광학유리를 사용하면서도 기준파장과

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Eyepiece Design

Cited by 20 publications

References 0 publications

Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications

Development of a Double-Gauss Lens Based Setup for Optoacoustic Applications

Overlapped Fourier coding for optical aberration removal

Optical Design of a Collimator Lens That Is Very Stable Against Chromatic Variation

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