M40 Laser Jammer provides front and rear laser jamming. 4 laser modules are provided M20 Laser Jammer provides front only laser jamming on passenger cars, but may not be sufficient for the front of a large SUV or large pick up truck. EScort ZR3 laser jammer Corvette installed with Laser Blinders installed under the rear bumper. Laser Blinders installed on a Harley Davidson, one module between the front forks, the 2nd module just under the rear tail light.

Laser jammers, also referred to as laser defuser, laser shifter and laser scrambler, are designed to blank the speed display of a laser gun. What does this mean to the driver?

In Laser Gun 101, we discussed how laser guns are used to acquire the speed of a vehicle. If you could slow a laser beam down so that you could see it as it passed by you at night, the laser beam from the gun would look like a picket fence or a light train, traveling down the highway. A light pulse (light on), followed by a dark space (light off), followed by a light pulse, etc.; i.e, a picket fence.

There are a series of these pulses traveling at light speed down the highway. As this light train stikes your car, it scatters a light reflection back towards the laser gun, which also has a laser detector. The laser gun knows when it transmitted each pulse, and measures the time it takes for each pulse to travel out and back. Speed equals "Distance / Time". Time is relative to speed, and the vehicle speed can be quickly calculated in about 1/5th of a second.

A Laser Jammer has to be able to detect the incoming laser beam, alert the driver to slow down, and then transmit a light noise signal that confuses the laser gun, such that the laser gun does not display a speed. Since a laser gun transmits a series of pulses, then the laser jammer has to be able to quickly recognize the incoming laser, and respond accordingly. A good laser shifter will analyze the laser beam coming in and know which laser gun is being used. A poor laser scrambler simply emits a constant stream of light noise, which any laser gun can disregard.

Knowing which jammer is good and which is poor, is a good thing to investigate. Good laser jammers, obviously, will instantly detect a laser gun, alert the driver and jam the laser gun at any distance all the way to the laser gun. This is called "JTG", Jam to Gun. However, there are very few good, laser jammers, that can operate to this level of performance. Blinder M25, M45 Laser Jammer, Passport ZR3, Laser Interceptor and are four of the best.

A laser gun transmits its light pulse at different repetition frequencies; i.e., the time duration between each pulse train varies, generally between 100 hertz and 1000 hertz. [100 hertz = 100 cycles per second]. The laser beam is 904nm in wavelength, way above our human vision; thus, we can not see the laser beam.

In order that a laser jammer be effective, it has to transmit a similar light pulse in the form of noise at the same wavelength and repetition frequency. The noise pulses from the jammer must overpower the received laser pulses from the laser gun, whicvh were reflected off your vehicle as you drove along the highway.

Most laser jammers use Infrared Light Emitting Diodes (ILED) to generate a jamming light signal. ILEDs are less expensive, but in order to be effective to jam front laser, a minimum of 16 ILEDs are required to produce the right amount of power to defeat the laser gun. ILEDs have very high reliability, as long as the ILED output is short, fast bursts of power. ILEDs have a very fast rise time (turn on time), thus look very similar to light pulses from a laser gun, which also have a very fast rise time.

Some laser jammer companies use a single, solid state, laser diode, which costs much more than 16 ILEDs. Laser diodes have the advantage of small component size, providing much more power than 16 ILEDs, thus when used, the laser jammer product package can be much smaller with higher power out. The down side is a potential heat problem, thus reliability would be low, if cooling the laser diode is not effective and constant.

Whether a laser shifter uses ILEDs or laser diodes, a good laser gun can filter out false noise. Since a laser jammer is introducing false noise, it must be able to get around the laser gun defenses. Some so-called jammers are designed to simply send out a constant infrared light stream. A laser gun will see this as light noise, similar to sunlight, and easily ignore the constant light noise.

As you can see, a good laser gun can easily ignore false noise. A good laser jammer, therefore, must be able to transmit back a very similar light signal to the laser gun with a similar repetition frequency, correct wavelength and enough power to overcome the laser gun signal.