I'm not sure laser guidance works how you think it works. The laser is probably the least important part of laser guidance. It's basically being used as a hig

I'm not sure laser guidance works how you think it works. The laser is probably the least important part of laser guidance. It's basically being used as a highly collimated and monochromatic photon source. Radio-guided weapons were already being deployed by the end of WWII. The presence of lasers which probably could have been invented with 1940s tech had priorities been different, wouldn't really have drastically changed much. Semiconductors and microelectronics are what enabled practical laser-guided weapons, by reducing the size, fragility and cost of guidance packages.