Most visible and near-infrared light can be absorbed by the eye, causing retinal damage. However, lasers with wavelengths between 1.4 and 2 μm are primarily absorbed by the lens when irradiating the human eye, with only a small part reaching the retina. As a result, these lasers are considered eye-safe. Notably, this wavelength range falls within the atmospheric transmission window, which is critical for long-distance applications. Within this range, a 1.54 μm laser is the safest for the human eye, and is classified as a Class 1 laser.

Common methods for generating 1.5 µm wavelength lasers include Stimulated Raman Scattering (SRS), Optical Parametric Oscillators (OPO), Erbium Glass Lasers, Erbium-Doped Fiber Lasers, etc. Solid-state lasers using erbium glass as the gain medium are favored for their simple structure, high conversion efficiency, no need for temperature control, and low mass production costs. These characteristics have led to their widespread use in laser radar, laser ranging, remote sensing, and target recognition, where compact size, light weight, and wide temperature range performance are crucial.

The 1535 nm eye-safe Erbium Glass Laser developed by Beijing RealLight Technology Co., Ltd. has received extensive praise from customers for its exceptional performance. However, some customers encounter difficulties when manufacturing laser rangefinders. For example, the emission antenna selected during optical design may not ensure proper focusing, divergence, and detection capability, resulting in increased optical losses. Additionally, external photodiode may struggle to ensure the sensitivity and response speed needed to accurately receive returned laser signals. In response to market demand, we are proud to introduce the “T01 Series Eye-Safe Laser Transmitter,” an integrated laser module.

This product integrates the erbium glass-based diode-pumped passively Q-switched laser developed, designed, and manufactured by RealLight, together with the transmitting antenna and the photodiode (PD) into one compact unit. It outputs a 1535nm pulse laser with a pulse width of less than 5 ns and a selectable single pulse energy of 100 µJ, 200 µJ, or 300 µJ. The repetition frequency is 10 Hz, and the full-angle divergence is about 0.5mrad. With a compact structure and a weight of approximately 13g, the transmitter includes a high-magnification transmitting lens and a photodiode (PD) that provide a synchronized signal to ensure ranging accuracy. It can operate stably in environments with temperatures ranging from -40°C to 65°C, making it ideal for portable handheld laser rangefinders, small-scale rangefinders, and other applications. Specific parameters are listed in the table below.

T01 Series Technical Specifications:

T01 Series Features:

Integrated Design: Combines diode-pumped passively Q-switched erbium glass laser, transmitting antenna, and photodiode (PD) into one unit.

Eye-safe Wavelength: Outputs a 1535 nm eye-safe laser to ensure safety during use.

High Magnification Emission: The transmitting lens provides up to 25X magnification to ensure the accuracy of laser ranging and remote sensing.

Laser Synchronization Signal: Provides a synchronization signal to enhance system stability and reliability.

Excellent Performance: Small size, narrow divergence angle, and wide operational temperature range make it suitable for various complex environments.

T01 Series Mechanical Drawings:

For more information, please visit our official website or contact our sales team for professional consultation and support!

Thank you for your attention. Let us explore the infinite possibilities of laser technology together!

References:

[1] Ding Yuming, Du Lihui. Eye-Safe Laser Technology and Applications [J]. Applied Laser, 1997, 17(1): 37-40.

[2] Zhu Yu, Chen Jinbang, Qing Guangbi, Zhu Rihong, Liu Hui. Progress in Eye-Safe Laser Rangefinders [J]. Laser Magazine, 1998, 19(6): 1-10.

[3] Liao Linwei. Compact Eye-Safe 1.5 µm Erbium Glass Laser [J]. Optical and Optoelectronic Technology, 2024, 22(5): 108-112.

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