Dielectric coatings are one of our core competencies at Laser Components. We primarily deposit customer-specific optical coatings onto almost any substrates. E-beam technology, also referred to as physical vapor deposition (PVD), ion-assisted deposition (IAD), and ion beam sputtering (IBS) are the coating processes currently available.
Dichroic mirrors to combine or separate two beams with different wavelengths.
Dichroic mirrors are used to combine beams or to split two beams that have different wavelengths. With a long-pass mirror, the long wavelengths are transmitted and the short ones reflected. Short-pass mirrors allow the short wavelengths to pass and reflect the long ones.
These mirrors are available with high power coatings from 193 nm to 3 µm and for cw/fs lasers from 450 nm to 2 µm.
The following "golden rules" can help you find the best combination for your application:
The bandwidth for the reflected part of the beam is limited. For the best possible beam separation or combination, it is important to allow a wavelength range to be transmitted and individual wavelengths to be reflected.
The absolute degree of reflection is higher for s-polarized light than it is for p-polarized light. For transmission the relationship is the exact opposite. Therefore, keep the polarizations in your assembly in mind.
The reflection of a beam is more efficient. If you require greater efficiency at a certain wavelength for your application, consider this when selecting a mirror.
A reflection peak is generated at the corresponding l/2, l/3,... parts of the reflected wavelength. A long-pass coating should be the preferred choice for this combination.
Example: Instead of an HR1064+532HT355 coating, an HR355HT532+1064 coating would be preferred.