Laser rangefinding utilizes lasers as the light source for measuring distances. Based on the operation mode, lasers can be categorized into continuous lasers and pulsed lasers. Gas lasers such as helium-neon, argon-ion, and krypton-cadmium operate in continuous output mode and are used for phase-based laser rangefinding. Double heterojunction gallium arsenide semiconductor lasers are employed for infrared rangefinding, while solid-state lasers like ruby and neodymium glass are used for pulsed laser rangefinding.

A laser rangefinder is an instrument that accurately measures the distance to a target using laser technology. Due to the excellent monochromaticity and strong directionality of lasers, combined with the integration of semiconductor electronic circuits, laser rangefinders can operate both day and night, and offer higher measurement accuracy compared to optical rangefinders. During operation, the rangefinder emits a narrow laser beam towards the target. A photodetector receives the reflected laser beam, and a timer measures the travel time from emission to reception, thereby calculating the distance from the observer to the target.

Phase-based laser rangefinders modulate the amplitude of the laser beam using a frequency in the radio wave band and measure the phase delay of the modulated light after it travels to the target and back. The distance is then calculated from the phase delay based on the wavelength of the modulated light. This method indirectly determines the time required for the light to travel the measured distance.

Pulsed laser rangefinding measures the distance by evaluating the flight time of laser pulses. It leverages the characteristics of laser pulses, such as their extremely short duration, temporally concentrated energy, and high peak power. With a cooperative target, the measurement range can reach several kilometers to tens of kilometers. Even without a cooperative target, short-distance measurements with low precision requirements are possible.

Beijing RealLight Technology Co., Ltd. produces a 1535nm microchip laser module that operates at an eye-safe wavelength, offering significant advantages in laser rangefinding and radar applications. This series of lasers feature clean, tail-free pulses, stable single-pulse energy, and high beam quality. The integrated design of the semiconductor pump module and laser crystal results in a compact and convenient package for installation and integration. The output energy of this series can reach up to 100-1000μJ.

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