Where are rotary stages used?

Rotary stages are used in applications where a precise positioning of an object around an axis is required. It is often used in optical setups and photonics equipment to precisely position and rotate an optical element, such as a mirror, laser crystal, polarizer, etc.

How does a manual rotation stage work?

A manual rotary stage typically consists of a round base plate and a platform that rotate relative to each other. These two components move relative to each other using a round rail guide that restricts the motion in one plane and around a specified axis. There are several different types of rail guides / bearing systems, each of which come with their unique pros and cons.

How to select the right rotation stage for my application?

There are a few key parameters and features to look for when selecting the proper rotary stage for your application. This includes the rotation range, often specified in degrees, load capacity, the build material (aluminum, stainless steel, etc.) as well as the accuracy, sensitivity and precision. Your specific requirements will dictate the type of stage and parameters needed. For example, if you are aligning a laser crystal or a polarizer, you might need high precision and thermal stability. Other applications might require lighter construction or higher load capacity, etc.

How to mount a rotation stage on an optical table or breadboard?

Most rotary stages come with predrilled mounting holes and you can use these holes to mount the stage on an optical table or a breadboard. For sensitive applications, such as the optical alignment of a laser crystal or polarization optics, you will also need to worry about the thermal stability and mount the stage in such a way that lateral expansion does not significantly distort the alignment. For these purposes you might want to use optomechanical clamps instead of relying on predrilled holes to avoid warping due to thermal expansion. Remember, we are talking about um level effects that would be enough to distort the optical alignment.

Should I buy aluminum or stainless steel rotary stage?

It really depends on your application. Aluminum rotation stages offer light and robust construction and are typically more affordable than their stainless steel cousins. They also often come in black anodized finish that minimizes stray light reflection. On the other hand, stainless steel stages are heavier and can offer more stability and precision. All else being equal, they are typically heavier and more expensive.

What is the price range on rotary stages?

As in other precision instruments the price of a rotation stage can vary significantly depending on their specs. On the lower end you should expect to pay a few hundred dollars for a simple manual rotary stage of 75mm in diameter, while high-end models can reach and exceed $1,000 per unit.

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