Do you guys know a low-cost low-threshold optical beam limiter, with cost somewhere ~$100. Or if you know certain method to fabricate such. I would be greatful if you could include links and/or references. I am still noob in photonics so I am only familiar with a beam limiter that blocks the entire incoming lase beam when its intensity is at a certain threshold of the beam limiter. In other case the beam limiter will always permit laser beam that has less than the threshold intensity.