Diffraction Grating Handbook by Palmer С.

By Palmer С.

In composing the fourth variation of the Diffraction Grating instruction manual in early 2000, i didn't count on to fret a couple of 5th version for numerous years, as Thermo RGL had 10,000 copies published. by means of the start of 2002, even if, we had allotted all yet a couple of hundred copies, so both a reprinting of the fourth variation or of an up to date model was once required. The technical employees of Thermo RGL has made the latter selection, which has resulted in this increased and corrected model of the guide.

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Pulsed lasers often require optical components with high damage thresholds, due to the short pulse duration and high energy of the pulsed beam. For gratings used in the infrared, gold is used as the reflective coating, and a standard gold-coated replica grating can tolerate an energy density at 10 microns of about 10 J/cm2; for a 10 nsec pulse this corresponds to a power density of 1 GW/cm2. The damage threshold for a subnanosecond 1 micron is about 400 mJ/cm2. Doubling the thickness of the reflective layer can greatly increase the damage threshold of a replicated grating used in pulsed beams.

INTRODUCTION [top] Since the late 1960s, a method distinct from mechanical ruling has also been used to manufacture diffraction gratings. This method involves the photographic recording of a stationary interference fringe field. asp (1 of 13) [6/15/02 6:28:41 PM] Diffraction Grating Handbook - Chapter 4 interference gratings, more commonly (though inaccurately) known as holographic gratings, have several characteristics that distinguish them from ruled gratings. In 1901 Aimé Cotton produced experimental interference gratings, fifty years before the concepts of holography were developed by Gabor.

As upper limits, holographic gratings recorded with visible light are usually limited to a few thousand grooves per millimeter, whereas ruled gratings have been produced with over 10,000 grooves per millimeter. 5. Differences in the groove patterns Classical ruled plane gratings, which constitute the vast majority of ruled gratings, have straight equally-spaced grooves. Classical ruled concave gratings have unequally spaced grooves that form circular arcs on the grating surface, but this groove pattern, when projected onto the plane tangent to the grating at its center, is still a set of straight equally spaced lines.

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