Abstract

A multipass, Brewster prism monochromator that is an effective laser beam separator is described. Fourteen passes through the prism of the monochromator produce a resolution of 4 cm−1 with a throughput of 63%. Larger throughputs are obtained for fewer passes and a poorer resolution. The device is tunable and has an extinction coefficient of 2 × 10−8 at a detuning of 200 cm−1. It promises to be an important tool for coherent Raman spectroscopy.

© 1989 Optical Society of America

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References

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  1. M. V. R. K. Murty, “The Use of a Single Plane Parallel Plate as a Lateral Shearing Interferometer with a Visible Gas Laser Source,” Appl. Opt. 3, 531 (1964).
    [CrossRef]

1964 (1)

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Figures (3)

Fig. 1
Fig. 1

Elevation of the monochromator showing the mirrors and prisms. The beam enters from the right through the first Littrow prism at a slight angle to the horizontal. After the tuning mirrors return it along its path, it has stepped down by one beam diameter to enter the Brewster prism. The beam continues down in this manner until its last pass brings it to the bottom Littrow prism whereupon it leaves the monochromator.

Fig. 2
Fig. 2

Schematic of the monochromator and apparatus for measuring its extinction coefficient as seen from the top. A glass wedge was used to monitor the laser beam intensity without incurring interference effects between the reflections from the front and back surfaces.

Fig. 3
Fig. 3

Normalized throughput as a function of the monochromator detuning. The data represented by squares were recorded with five baffles placed in the monochromator—one where the first Littrow prism meets the first Brewster prism, two where the Brewster prisms meet, and two around the output beam from the last Littrow prism. The data represented by triangles show the output laser beam intensity as a function of the detuning with the addition of a spatial filter.

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