A different take on a laser projection microscope

[Dusjagr] has another take on building a laser projection microscope. Last year we saw a laser-based microscope that shined the beam of light through a water droplet which contained the subject to be magnified. The droplet bent the focused beam of light and projected the magnified contents onto a screen. Now that’s pretty neat and [Dusjagr] has used that method himself. But most traditional microscopes use glass slides to contain the subject and this new version now makes that possible.

A bit of experimentation led [Dusjagr] to the discovery that a lens re-purposed from a webcam can achieve similar focus results as a water droplet. The video after the break shows the apparatus seen above in action. The laser shines through the lens, then through a slide that contains a water sample from a nearby pond. The image is clear, albeit completely bathed in green.

For us the most interesting part of [Dusjagr’s] writeup is his discussion of the limits of laser amplification based on the wavelength of light the diode puts out.

12 thoughts on “A different take on a laser projection microscope

  1. Bacteria and other um sized objects can be seen in a visible light microscope. After all, that’s what the common microscope is used for. Optics quality is usually the limiting factor.

  2. @Jim Lund:
    Technically, this is also a visible light microscope. I suppose you meant _conventional_ visible light microscope.

  3. I still think someone needs to try this with a UV laser projected onto a glow in the dark surface.

    Since the UV laser will charge the phosphors it will act like a photographic plate. Long exposure laser microscopy. :)

    If someone tries this, be sure to kill the lights after a short exposure so you can see/photograph the image.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s