1064nm Spatial AOM Technology Analysis: ≥80% Diffraction Efficiency and 1000:1 Ultra-High Extinction Ratio Performance Evaluation
1064nm Spatial AOM Technology Analysis: ≥80% Diffraction Efficiency and 1000:1 Ultra-High Extinction Ratio Performance Evaluation
Blog Article
In the precision field of optical modulation technology, the 1064nm spatial acousto-optic modulator (AOM) has become a core component in applications such as lidar and material processing due to its outstanding performance. Among them, the diffraction efficiency of ≥80% and the ultra-high extinction ratio of > 1000:1 further demonstrate its technical advantages. The following is an in-depth analysis of these two performances and their overall application value.
The working principle and performance basis of 1064nm space AOM
The 1064nm spatial AOM is based on the acousto-optic interaction. The radio frequency signal drives the piezoelectric transducer to excite ultrasonic waves in the acousto-optic medium (such as tellurium oxide), forming a dynamic refractive index grating. When a 1064nm laser is incident, Bragg diffraction occurs, achieving intensity and frequency modulation. The all-metal casing packaging and conductive cooling design ensure the high-temperature stability and reliability of the device, providing physical support for performance such as diffraction efficiency and extinction ratio.
≥80% diffraction efficiency: Efficient utilization of optical energy
(1) Technical significance of diffraction efficiency
Diffraction efficiency measures the ability of an AOM to convert incident light into diffracted light. ≥80% indicates that over 80% of the incident light is involved in effective modulation. In lidar applications, high diffraction efficiency can enhance the utilization rate of emitted laser energy, make the echo signal stronger, and increase the detection range and target recognition accuracy. In the field of material processing, more light energy acting on materials can enhance processing speed and quality. For instance, when laser cutting thick metal plates, the high diffraction efficiency ensures the concentration of laser energy, achieving rapid and precise cutting.
(2)Performance Assurance and Influencing Factors
This performance stems from the optimized audio-visual medium and structural design. Select tellurium oxide medium with high acousto-optic superiority value to enhance the acousto-optic interaction; Precisely control the thickness of the acousto-optic medium and the ultrasonic frequency, and match the Bragg diffraction conditions of 1064nm laser. Meanwhile, the strict production process ensures the coupling efficiency between the piezoelectric transducer and the medium, reduces energy loss, and guarantees that the diffraction efficiency remains stable at ≥80%, making it suitable for laser systems of different powers and application scenarios.
> 1000:1 Ultra-high extinction ratio: Clear optical modulation boundary
(1) Performance value of extinction ratio
An extinction ratio of over 1000:1 reflects the contrast of the laser in the "on-off" state. In the "on" state, the laser carries modulation information. In the "off" state, there is very little light leakage. In the laser Doppler system, the signal light and the noise light can be effectively distinguished, improving the accuracy of speed and current measurement. In Q-switch applications, the clear "on-off" boundaries generate laser pulses with narrower pulse widths and higher peak power, facilitating industrial precision processing and scientific research laser experiments.
(2)Realization Mechanism and Advantage Manifestation
The high extinction ratio stems from the precise optical path isolation and medium design. Inside the AOM, stray light is reduced by optimizing the optical uniformity of the acouste-optic medium and controlling the polarization state. Combining the feature of a static transmittance as high as 95%, the light in the "on" state is transmitted efficiently, while the light in the "off" state is significantly suppressed. In image processing devices and cold atom physics experiments, a high annihilation ratio can reduce background noise, ensure clear signals, and provide high-quality optical modulation for scientific research observations and industrial inspections.
Multi-scenario application: Practical verification of performance advantages
(1) Lidar
In the autonomous driving lidar, the high diffraction efficiency of the 1064nm spatial AOM ensures the emission of laser energy, making the echoes of distant targets clear. The ultra-high extinction ratio makes the laser pulse "on - off" distinct, accurately measuring the distance and speed of the target, providing reliable data for the safe navigation of vehicles.
(2) Material Processing
In laser cutting and welding equipment, a diffraction efficiency of ≥80% enhances the laser energy density to achieve rapid processing. High extinction ratio and precise control of laser pulses can prevent incorrect energy output, protecting equipment and processed parts. For instance, in the welding of precision electronic components, it can prevent laser "accidental touch" from damaging the surrounding circuits.
(3) Laser Doppler system
When measuring fluid flow velocity and object movement speed, the high diffraction efficiency of AOM ensures signal strength, and the ultra-high elimination ratio enhances the signal signal-to-noise ratio. Whether it is industrial pipeline fluid monitoring or biomedical blood flow detection, it can provide high-precision data.
Performance synergy and technological outlook
The high diffraction efficiency and ultra-high extinction ratio of 1064nm spatial AOM do not exist in isolation. They work in synergy with fast modulation speed, high-temperature stability and other performance features to build a powerful optical modulation capability. In the future, with the development of materials science and micro-nano processing technology, it is expected to further enhance diffraction efficiency (such as breaking through 90%), reduce driving power, expand applications in cutting-edge fields like quantum optics and super-resolution imaging, and continuously empower the innovation of optoelectronic technology.
The 1064nm spatial AOM demonstrates critical value in multiple fields with a diffraction efficiency of ≥80% and an ultra-high extinction ratio of > 1000:1. From performance analysis to application practice, it provides efficient and precise technical support for optical modulation systems, promoting laser applications to move towards greater intelligence and precision, and becoming an important driving force for the development of the optoelectronics industry. Report this page