Ultracompact RGB laser diode module for near-to-eye displays

Primerov, Nikolay; Ojeda, José; Gloor, S.; Matuschek, N.; Rossetti, M.; Castiglia, A.; Malinverni, Marco; Duelk, M.; Vélez, Christian

doi:10.1117/12.2594243

Cited by 5 publications

(9 citation statements)

References 4 publications

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“…As a disadvantage, the need for specific equipment for spectral line imaging of skin can be mentioned. However, currently, there are all technical preconditions for creation of suitable low-cost diagnostic devices of this kind as compact and stable low-power RGB lasers are entering the market 21 and uniform triple spectral line illumination of skin can be easily performed, e.g., by exploiting side-emitting optical fibers. 22 Tools for elimination of the laser speckle artifacts in spectral line images are developed, as well.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional representation of triple spectral line imaging data as an option for noncontact skin diagnostics

et al. 2022

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. Significance: Skin malformations in dermatology are mostly evaluated subjectively, based on a doctor’s experience and visual perception; an option for objective quantitative skin assessment is camera-based spectrally selective diagnostics. Multispectral imaging is a technique capable to provide information about concentrations of the absorbing chromophores and their distribution over the malformation in a noncontact way. Conversion of spectral images into distribution maps of chromophores can be performed by means of the modified Beer–Lambert law. However, such distribution maps represent only single specific cases, therefore, some extensive method for data comparison is needed. Aim: This study aims to develop a more informative approach for identification and characterization of skin malformations using three-dimensional (3D) representation of triple spectral line imaging data. Approach: The 3D-representation method is experimentally tested on eight different skin pathology types, including both benign and malignant pathologies; an imaging device ensuring uniform three laser line (448, 532, and 659 nm) illumination is used. Three spectral line images are extracted from a single snapshot RGB image data, with subsequent calculation of attenuation coefficients for each working wavelength at every image pixel and represented as 3D graphs. Skin chromophore content variations in malformations are represented in a similar way. Results: Clinical measurement results for 99 skin pathologies, including basal cell carcinomas, melanoma, dermal nevi, combined nevi, junctional nevi, blue nevi, seborrheic keratosis, and hemangiomas. They are presented as 3D spectral attenuation maps exhibiting specific individual features for each group of pathologies. Along with intensity attenuation maps, 3D maps for content variations of three main skin chromophores (melanin, oxyhemoglobin, and deoxyhemoglobin), calculated in frame of a model based on modified Beer–Lambert law, are also presented. Advantages and disadvantages of the proposed data representation method are discussed. Conclusions: The described 3D-representation method of triple spectral line imaging data shows promising potential for objective quantitative noncontact diagnosis of skin pathologies.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional representation of triple spectral line imaging data as an option for noncontact skin diagnostics

et al. 2022

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“…Other light source modules emit collimated and collinearly aligned RGB beams but the beam shape might be elliptical with some astigmatism, or the beam diameter might be significantly smaller than 1 mm, which is less preferred for waveguide-based AR/MR glasses. Here, a second generation (Gen-2) of a compact RGB light source module with a novel architecture is presented, delivering collimated, collinear output beams that are circular in shape and larger than 1 mm in beam diameter, which is a significant improvement over our first generation (Gen-1) of an RGB light source module we presented previously [8].…”

Section: Dimensionsmentioning

confidence: 99%

“…Consequently, the output power levels of the RGB light source module are close to the free-space output power values of the SLED and LD chips. [8] and for the Gen-2 hybrid RGB LD-SLED module presented here. The beam diameters are measured at the 1/e 2 relative intensity level.…”

Section: Electro-optical Module Performancementioning

confidence: 99%

“…Table 2a and 2b summarize the most relevant beam parameters (in horizontal X and vertical Y direction) of the Gen-1 RGB module [8] and of the new Gen-2 RGB module presented here, respectively. While the beam waist position is close to the RGB module, the beam parameters have been measured at a defined reference distance of 50 mm from the module.…”

Section: Electro-optical Module Performancementioning

confidence: 99%

“…Such systems typically require only low output power levels of 2-5 mW per color from the light source module. Furthermore, smaller optical beam sizes are often acceptable, which is beneficial for realizing ultra-compact RGB modules [8]. However, a typical drawback of such direct retinal projection systems is the limited FOV.…”

Section: Introductionmentioning

confidence: 99%

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Ultracompact RGB hybrid LD-SLED module based on micro-optics

Primerov,

Jobson,

Rios

et al. 2023

Digital Optical Technologies 2023

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We present, to the best of our knowledge, the first compact, full-color, hybrid RGB LD-SLED light source module designed for near-to-eye display systems. This module integrates a blue and green semiconductor laser diode (LD) at a wavelength of 453 nm and 520 nm, respectively, and a red superluminescent diode (SLED) at 639 nm in combination with a novel micro-optical, free-space architecture. The light source module includes circularizing optics, wavelengthcombining filters, and a single aspheric collimation lens. The light source module has a compact footprint of 7.7 mm x 10.8 mm and generates collimated, circular and collinearly aligned RGB beams with low divergence and large diameters in the range of 1.7 mm to 2.2 mm at the optical output. The current generation of this light source module delivers up to 15 mW of optical power per color, with a total power dissipation value of only 430 mW.

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