Application engineer Cui Mingming said in an interview that there are two obvious trends in the development of current semiconductor laser pointer. The first is that packages are getting smaller and smaller. Taking mainstream COC packages as an example, the current package size has changed from the previous millimeter. The size has been greatly reduced to today’s micron level, and its pad size has dropped to 200um or even smaller. The second trend is that there are more and more integrated devices on the chip. In the past, simple DFB chips could not meet the market demand. At present, there are more and more cases where EA, SOA, MPD, thermistor and other devices are integrated on the chip.
In response to the above two major trends, a probe card fixture is introduced. Compared with the old pogo pin fixture, the new probe card can be used for chips with a pad size above 150 * 150um. Pogo pin fixtures have significantly reduced reliability when facing pads below 400um. Especially for chips below 200um or integrated with EA, it is already inadequate, and the Probe card fixture can perfectly solve this problem.
As it gets smaller and smaller, the heat dissipation of the chip becomes a big problem. The laser pointers fixture provides different thermal coatings for the user’s chip, which can effectively reduce the internal and external temperature difference of the chip. In addition, due to the modular design, when users have new chips, they only need to purchase power-on modules. For users at the R & D stage, equipment costs can be significantly reduced. The aging test integrated system integrates the PD to measure the optical power in real time while aging. Provide LIV online test. Another carrier fixture that was unveiled at the exhibition allows users to bond on the fixture, reducing the number of chip loadings from 3 to 1 in the entire process, simplifying the user’s production line and increasing the degree of automation.
The aging system has obvious advantages, which helps to improve the performance of the laser pointer. Due to the material of the semiconductor laser, the influence of temperature and driving current on its lifetime is very significant. Relevant research shows that the lifetime of some DFB semiconductor lasers at 70 degrees is only 1/50 of that at normal temperature, so the aging of lasers has become the consensus of the entire industry, and aging has become an essential process in laser production.