Description

1535nm Er Glass Eyesafe Laser

Wavelength of 1.4-2.0 um is less harmful to the human eye, so a laser with this wavelength range is called the human eye-safe laser. This wavelength range is located in the atmospheric transmission window, the absorption and scattering of the laser is only 1/50 of the 1.06um laser, which is of great significance for long-distance action, especially for military applications.

Application

Laser ranging
Laser irradiation
Laser radar
Target recognition
Laser medical treatment
Optical fiber communication

Feature
Beam quality near diffraction limit
Small volume
Low power consumption
no temperature control
Open and be used
High reliability
Good stability
Wide temperature range

Principal

The damage threshold for human eye is high when a laser with a wavelength greater than 1.4 um, because when it is irradiated to the human eye, most of its light intensity is absorbed by the vitreous body, so it is not easy to damage the retina at a certain power.( Taking the 1.57um laser as an example, according to the US national security standards, its safe exposure to human eye is 400 thousand times that of the 1.06um Nd:YAG laser currently used.) So it is called the human eye safety wavelength. In this band, the safest band is located near 1.54um, so there are also people’s eye safety limits to 1.5-1.7um, which has a large contrast to the background of many targets, such as vehicles, ships, cement buildings, etc., which is very attractive in laser radar, target recognition and so on.

The following diagram is a structure diagram of a human eye-safe laser.