Browse Prior Art Database

Laser-Driven Tandem Microscope

IP.com Disclosure Number: IPCOM000036930D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Goodman, DS: AUTHOR [+2]

Abstract

Disclosed is a method to illuminate a tandem confocal microscope [*] with laser light instead of the broadband incoherent light presently used.

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Laser-Driven Tandem Microscope

Disclosed is a method to illuminate a tandem confocal microscope [*] with laser light instead of the broadband incoherent light presently used.

The invention is shown in the figure. A laser cavity is set up in the usual way for producing polarized light. A polarizing element 1 such as a glan prism is inserted in the laser cavity formed by a high reflectivity mirror 2, the lasing medium 3 and the output mirror 4. The output mirror 4, however, is a 100% reflecting mirror with holes etched in the high reflectivity coating so that the average mirror reflectivity is the same as that of the the output coupler of the normal laser. For example, a continuous Nd-YAG laser would have output coupler reflectivity 80-95% for most efficient operation, while a blue helium- cadmium laser would have an output coupler reflectivity of 97%. The images of the holes in the output flat are then projected by the optical system 5 of a normal confocal microscope through a g/4 plate 6 onto the surface 7 to be studied. The light 8 reflected from the surface is then carried back through the g/4 plate 6 back through the holes in the output coupler 4 of the laser, and to the polarizing element 1. Since the polarized light has passed through the g/4 plate 6 twice, it is now linearly polarized in the opposite sense to the original laser light, and is reflected at the polarizing element through an imaging system 9 which images the holes in the output flat onto a mult...