High‐pixel‐rate grating‐light‐valve laser projector

Kikuchi, Hiroe; Hashimoto, Shigeki; Tajiri, Shinichiro; Hayashi, Tsuneo; Sugawara, Yutaka; Oka, Motoo; Akiyama, Yoshiyuki; Nakamura, Akira; Eguchi, Naoya

doi:10.1889/jsid17.3.263

“…Our method, without a scattering medium, can serve as a general-purpose 1D-SLM such as a GLV, albeit with a much higher refresh rate. Therefore, it can be broadly used in high-definition panoramic display 40 , maskless lithography 41 , and spectral shaping 42 applications. Combined with scattering media, the FLASH focusing technique achieves random-access control of micrometer-sized focal spots over a large addressable volume of 5 mm × 5 mm × 5.5 mm at a maximum refresh rate of 31 MHz.…”

Section: Discussionmentioning

confidence: 99%

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography

Shibukawa,

Higuchi,

Song

et al. 2024

Nat Commun

1

0

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The capability of focus control has been central to optical technologies that require both high temporal and spatial resolutions. However, existing varifocal lens schemes are commonly limited to the response time on the microsecond timescale and share the fundamental trade-off between the response time and the tuning power. Here, we propose an ultrafast holographic focusing method enabled by translating the speed of a fast 1D beam scanner into the speed of the complex wavefront modulation of a relatively slow 2D spatial light modulator. Using a pair of a digital micromirror device and a resonant scanner, we demonstrate an unprecedented refresh rate of focus control of 31 MHz, which is more than 1,000 times faster than the switching rate of a digital micromirror device. We also show that multiple micrometer-sized focal spots can be independently addressed in a range of over 1 MHz within a large volume of 5 mm × 5 mm × 5.5 mm, validating the superior spatiotemporal characteristics of the proposed technique – high temporal and spatial precision, high tuning power, and random accessibility in a three-dimensional space. The demonstrated scheme offers a new route towards three-dimensional light manipulation in the 100 MHz regime.

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“…Our method, without a scattering medium, can serve as a general-purpose 1D-SLM such as a GLV, albeit with a much higher refresh rate. Therefore, it can be broadly used in high-definition panoramic display 41 , maskless lithography 42 , and spectral shaping 43 applications.…”

Section: Discussionmentioning

confidence: 99%

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography

Shibukawa

¹

,

Higuchi

²

,

Song

³

et al. 2023

Preprint

0

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The capability of focus control has been central to optical technologies that require both high temporal and spatial resolutions. However, existing varifocal lens schemes are commonly limited to the response time on the microsecond timescale and share the fundamental trade-off between the response time and the tuning power. Here, we propose an ultrafast holographic focusing method enabled by translating the speed of a fast 1D beam scanner into the speed of the complex wavefront modulation of a relatively slow 2D spatial light modulator. Using a pair of a digital micromirror device and a resonant scanner, we demonstrate an unprecedented refresh rate of focus control of 31 MHz, which is more than 1,000 times faster than the switching rate of a digital micromirror device. We also show that multiple micrometer-sized focal spots can be independently addressed in a range of over 1 MHz within a large volume of 5 mm × 5 mm × 5.5 mm, validating the superior spatiotemporal characteristics of the proposed technique – high temporal and spatial precision, high tuning power, and random accessibility in a three-dimensional space. The demonstrated scheme offers a new route towards three-dimensional light manipulation in the 100 MHz regime.

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“…Among them are flying-spot and grating light-valve projection (GLV) systems, where the laser beam is scanned over the projection screen and the information is written pixel by pixel (flying-spot) 3 or line by line as in the case of GLV systems. 4 The flying-spot technology has the strictest requirements on the laser source: The beam quality needs to be close to diffraction limited with a M 2 parameter well below two and a high modulation frequency of the laser of several tens of MHz.…”

Section: Projection Requirementsmentioning

confidence: 99%

“…Two major routes can be distinguished in second-harmonic generation: second-harmonic generation of a diodepumped laser or second-harmonic generation of diode laser radiation directly. In the former, a laser emitting infrared radiation with high beam quality such as a diode-pumped solid-state laser (DPSSL) 4,12,13 or an optically pumped semiconductor laser (OPSL) is pumped by an infrared diode. The infrared radiation is then frequency doubled in a second step.…”

Section: Second-harmonic Generationmentioning

confidence: 99%

Solid‐state lasers for projection

Weichmann

¹

,

Bellancourt

²

,

Mackens

³

et al. 2010

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Abstract— The unique advantage of projection displays is the ability to produce large images from small devices. The use of lasers as the projection light source will mean a further step in terms of compactness as well as efficiency for projection systems. However, the advent of laser projection is currently still limited by the availability of low‐cost green lasers. Blue‐diode‐pumped solid‐state lasers are one promising way to realize green as well as red lasers that are specifically suited for projection applications. An efficient solid‐state laser that is based on Pr3+:YLF as the laser material, pumped by a blue‐laser diode and emitting at 523 nm, is presented here. The laser reaches power‐conversion efficiencies of more than 7% and output powers of up to 378 mW at green wavelengths. By making only minor modifications to the laser resonator, a red laser emitting at 640 nm can be realized within the same setup. An output power of 166 mW at a power‐conversion efficiency of 6.9% is demonstrated in the red. By combining a red‐ and a green‐emitting blue‐diode‐pumped solid‐state laser with another blue diode, an integrated RGB projection light source can be realized that is based on a single‐diode technology.

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High‐pixel‐rate grating‐light‐valve laser projector

Cited by 6 publications

References 13 publications

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography

Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography

Solid‐state lasers for projection

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