i would like to know if a laser beam has a low frequency or a high frequency ?
Commonly when terms "low frequency" and "highfrequency" are used, they refer to the scale of radio frequencies, low frequencies being those in the range 30 kHz – 300 kHz and high frequencies being within 3 MHz and 30 MHz.
Lasers, on the other hand, usually refer to sources of lightwithin optical range of the electromagnetic scale, i.e. infrared, visible, and ultraviolet light. In comparison with radio range, they all have higher frequencies (shorter wavelengths) than radio, e.g. middle of visible in range has an order of 10^15 Hz, i.e. billions MHz. Worth mentioning, microwave range lasers (so called"masers") that are the transition between radio range and optical range, have frequencies of about 3 to 30 GHz and these are called "ultra-high frequencies". Thus, if referred to in the framework of radio frequencies,optical lasers definitely have high frequencies.