Dick Rieley, Sales Manager, Mid-Atlantic Region, Ophir-Spiricon Inc.
The production process employs both 532 nm and 1064 nm scribing lasers, mostly 30 W systems. Each panel is scribed by both wavelengths through the process. Their design has each panel placed on a horizontal X-Y table, and run back and forth under a fixed steel yoke where there are a minimum of four beams, scribing four lines simultaneously. The panel ends up with a series of voltage stripes, each about 1” wide and the length of the panel.
The challenge is to split a laser beam into multiple parts that perform equally for the scribing process. In this case, the laser needed to be split into four equal beams and delivered down onto the panel -- 800mm focal length, 60um focal spot, 26 uJ per pulse, 8,000 hz 25 ns pulse width. There are four of these systems.
In the 1064nm system, of which they have two, they have designed the overhead yoke to have eight vertical beams – four beams from one laser, and an additional four from a second laser. This allows the same panel to be processed in about 40 seconds, cutting their production time nearly in half. These two systems were: 260 uJ, 7,000 hz, 25 hz, 60 um beam, 1064 nm. (about 1.86 W)
In the above picture of the optical set up, we see optics with blue tape are sourced from the right hand laser and red from the left hand laser. The large X-Y table is below. The 8 brass fittings hold each of the final objective lens.
We conducted several tests to check the focal spot for each of the blue optics (red was not operational). Currently, the manufacturer has no easy method to check the focal spot, its size, or energy density. We used the Spiricon USB-SP620 camera and the LBS300 beam sampler positioned on a lab jack to allow the ability to move the camera back and forth through the focal point. The positioning of the camera and LBS300 can be seen below-sitting on the lab jack. We found that once we had the camera aligned for one optic, we could then just move the X-Y table to the right and subsequently test the other three beams easily and with comparative consistency.