Erbium Glass Laser in Laser Ranging
Long-range laser rangefinders are developing toward the trend of high safety, long measurement distance, high accuracy, low power consumption and miniaturization of size. At present, the common emission wavelength of rangefinder is 1064nm, which is easy to damage human retina and has great safety hazards. The miniaturization and high reliability of 1535nm human eye safety laser will become an inevitable trend. 1535nm human eye safety laser has been widely used in the fields of handheld rangefinder, gun sight, pod, fuze and border surveillance.
The principle structure of the ranging system is shown in the figure below, which mainly consists of four major parts: laser transmitting module, optical transceiver system, laser receiving system and signal processing system. The human eye safety ranging system uses an erbium glass solid-state laser to generate a hundred-μJ energy, low re-frequency, narrow pulse width 1535 nm laser, an APD with InGaAs as signal detection, and a TDC for time-of-flight measurement to obtain accurate distance information.
Schematic diagram of the distance measuring system
ERDI has developed a series of miniaturized, high peak power, highly reliable erbium glass human eye safety lasers for human eye safety ranging applications. 1535nm series products are available in a wide range of energies from 40μJ to 2.5mJ and heavy frequencies from 1Hz to 1kHz, in both round TO packages and traditional square packages. The products are light in weight and small in size, with semiconductor packaging process and stable performance, and have been approved by many professional customers, and the production capacity can reach 10,000pcs/month. Product parameters chart is as follows：
|Single pulse energy（μJ）||100||200||300||400||500||70||40|
|Repetition frequency (Hz)||10||10||10||10||5||100||1000|
|Dispersion angleTyp (mrad)||12||10||10||10||10||16||16|
|Size (L×W×H,mm)||21×8×7 /25×8×7|
|Operating temperature (oC)||-40oC~+60oC(Customizable -45oC~+65oC)|
|Storage temperature (oC)||-55oC~+70oC|
|Vibration||Meet GJB150A.16-2009 vibration test|
|Impact||Meet GJB150A.16-2009 impact test|
|Remarks||Other indicators are available for customization|
Erdi Laser Ltd has been established for more than ten years and has been focusing on the independent research and development and industrialization of lasers and laser ranging systems, as well as the mission of training excellent engineering talents for the optoelectronic industry. Over the years, we have provided many innovative and competitive products for customers in various fields such as analytical instruments, medical beauty, radar ranging, laser processing, scientific research and teaching. We look forward to being your strategic partner and your inspired launch!