Design of a multi-modality DMD-based two-photon microscope system.

We present the modular design and characterization of a multi-modality video-rate two-photon excitation (TPE) microscope based on integrating a digital micromirror device (DMD), which functions as an ultrafast beam shaper and random-access scanner, with a pair of galvanometric scanners. The TPE microscope system realizes a suite of new imaging functionalities, including (1) multi-layer imaging with 3D programmable imaging planes, (2) DMD-based wavefront correction, and (3) multi-focus optical stimulation (up to 22.7 kHz) with simultaneous TPE imaging, all in real-time.

Aberration-free 3D imaging via DMD-based two-photon microscopy and sensorless adaptive optics.

In this Letter, we present a new, to our knowledge, aberration-free 3D imaging technique based on digital micromirror device (DMD)-based two-photon microscopy and sensorless adaptive optics (AO), where 3D random-access scanning and modal wavefront correction are realized using a single DMD chip at 22.7 kHz. Specifically, the DMD is simultaneously used as a deformable mirror to modulate a distorted wavefront and a fast scanner to maneuver the laser focus in a 3D space by designed binary holograms.

Compressive sensing for fast 3-D and random-access two-photon microscopy.

3-D two-photon excitation (TPE) microscopy has been a critical tool for biological study since its introduction. Yet, the speed is largely limited by its point detector, e.g.

Spatially resolved random-access pump-probe microscopy based on binary holography.

In this Letter, we present a spatially resolved pump-probe microscope based on a digital micromirror device (DMD). The microscope system enables the measurements of ultrafast transient processes at arbitrarily selected regions in a 3-D specimen. To achieve random-access scanning, the wavefront of the probe beam is modulated by the DMD via binary holography.