Gratings

The bending of light by gratings is described by the well- known, grating equation:  d(Sin θm (λ) + Sin θi ) = mλ
Gratings can be binary or kiniform structures that control the diffraction angle based on the period. Gratings offer the advantage of being thin, produced in many materials, and can be operated in transmission or reflection modes.

Blazed Gratings

Blaze is defined as the concentration of a limited region of the spectrum into any order other than the zero order. JENOPTIK Microoptics blazed gratings are manufactured to produce maximum efficiency at designated wavelengths. A blazed grating is one in which the grooves of the diffraction grating are controlled to form right triangles with an extremely tight angular control. They can approach nearly 100% diffraction efficiency for small angles, they can even work well over a wide range of wavelengths despite being a diffractive etch for one wavelength.

Pulsed Compression Gratings

High output power femtosecond lasers require a sophisticated chirped pulse amplification (CPA) setup. A dielectric pulse compression grating is extremely efficient and durable under high laser power densities. Pulse compression gratings are made of high-purity fused silica and are thus well suited for a broad wavelength range. The use of fused silica over metal gratings results in more than 20% additional output power in a typical CPA setup with four grating passes.

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Pulse Compression Gratings