1. The Projecting Microscope A sample presentation by Chuck Rogers, Dept. of Physics, CU-Boulder 11/25/10Projection Microscope

2. Major Goals Learn how to use the optics lab room equipment. Hit the high points of observing and understanding laser beam properties and diffraction. Design a 400x projecting microscope Build the microscope and verify its behavior. 21/25/10Projection Microscope

3. The Optics Lab What’s in the cabinet? Setup the laser on the optical rail. Fiddle with Ronchi and lenses. Learn how to find lenses. 31/25/10Projection Microscope

4. Ronchi Grating (a spatial square wave) Measuring microscope view of the Ronchi grating. A ten period average shows a square wave period of 254 ± 3 microns/line. Diffraction pattern through the Ronchi. Shows only odd orders, consistent with a square wave. Diffraction theory predicts =d Sin  /N which gives Measured laser wavelength: 627 nm +/- 13 nm 15 fringes covered 68 ± 1 mm and the screen was 1840 ± 5 mm away so tan(  ) = 0.0370 ± 0.0006. Although only a 2% measurement (13/627), it is within 1% of the true wavelength (632.8 nm) 41/25/10Projection Microscope

5. Design of the 400x Projection Microscope 4x beam expander. Used Lx1 f.l.=25mm and lens Lx2, f.l.=100mm Two magnification stages of equal mag of 20x Built with equal focal length lenses f.l. = 50mm 51/25/10Projection Microscope

6. Sample images High resolution image of a single atomic state imaged with our microscope. 61/25/10Projection Microscope

7. Diffraction limits of resolution Modest choppiness on the image due to finite laser wavelength. We saw no effect from the iris because we put it in front of the beam expander rather than the first lens…. 71/25/10Projection Microscope

8. Summary Learned how to use the optics lab room equipment. Hit the high points of observing and understanding laser beam properties and diffraction. Designed a 400x projecting microscope Build the microscope and verified its behavior. 81/25/10Projection Microscope