Abstract
We present a wavelength tunable vertical-cavity surface-emitting laser (VCSEL) constructed by die-bonding a half-cavity InGaAs laser diode (LD) chip onto a silicon-on-insulator chip with a microelectromechanical system electrostatic diaphragm mirror that functions as a Fabry–Perot interferometer. As a result of the short cavity length, the integrated tunable LD has single-mode lasing characteristics with an extremely large coherence length of 150 m or more. The developed wavelength tunable LD is used to perform swept-source optical coherence tomography with a large scan depth, which is applicable to ophthalmic observation for the diagnosis of pathologic nearsightedness based on the measurement of the axial length of an eye.
Highlights
Myopia or nearsightedness is an ophthalmologic disorder that causes blurred vision and is usually corrected by wearing glasses or contact lenses.[1]
As a key component for such SS-optical coherence tomography (OCT) systems, we have developed a wavelength tunable laser diode (LD) using a microelectromechanical system (MEMS)-based electrostatic mirror that is coupled with a vertical-cavity surface-emitting laser (VCSEL) chip, which was originally invented by Iga and documented in detail in his recent review paper published elsewhere,[9] forming a Fabry–Perot interferometer
Wavelength tunable VCSELs are one of the most appropriate applications of optical microsystems based on MEMS technology
Summary
Myopia or nearsightedness is an ophthalmologic disorder that causes blurred vision and is usually corrected by wearing glasses or contact lenses.[1] When staring at nearby objects for extended periods of time, the ophthalmic lenses are deformed through tension in the musculus ciliaris and may temporarily have trouble focusing on a distant object. This type of nearsightedness is called refractive myopia or pseudomyopia, and it can be cured naturally over time or by medication that relaxes the tension in the musculus ciliaris, thereby allowing the lens to revert to the normal thickness. This paper includes extended results such as the large coherence length over 150 m, based on the precedent technical report presented at IEEE OMN 2019.10
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