-
Products
-
Advantages
-
-
-
Products and Applications
Terahertz (THz) waves are electromagnetic waves located between microwaves and infrared rays, characterized by high frequency stability and short pulse features. The photoconductive effect refers to the increase in electrical conductivity of certain materials when illuminated by light due to the generation of photogenerated carriers. By utilizing this effect, a periodic sequence of optical pulses (i.e., an optical frequency comb) can be injected into photoconductive materials to generate a periodic sequence of electrical current pulses, thereby producing corresponding electromagnetic waves in the terahertz band. Using an optical frequency comb to inject photoconductivity can excite high-quality terahertz (THz) waves.
Microwave sources with ultra-low phase noise are crucial for satellite communications, radar detection, precision measurement, and synchronization systems. Currently, the most mature technology for stable microwave signal synthesis is based on upconverting radio frequency signals from oven-controlled crystal oscillators (OCXO). This method inevitably leads to secondary amplification of additional phase noise.
Laser time-frequency transfer is a high-precision time and frequency transfer technology that uses lasers as carriers to transmit time-frequency information. Optical frequency combs have extremely high stability and accuracy, with very short pulse rise times. Using the optical frequency comb's carrier can achieve sub-nanosecond level time synchronization accuracy. It has important applications in fields such as clock comparison, timekeeping and timing, navigation and positioning, radar networking, deep space exploration, particle accelerator synchronization, and gravitational wave detection.
An optical clock is a device that uses transitions of atoms or ions within the optical frequency range to measure time, with precision far exceeding that of current atomic clocks based on microwave frequencies. It is the gold standard of time and the ultimate pursuit of technology. The working principle of the optical clock is to lock a femtosecond laser frequency comb to an optical frequency standard, thereby achieving ultra-high precision time measurement. The development of this technology is expected to make optical clocks the future standard for redefining the "second." With technological advancements, the precision of optical clocks continues to improve, and they are expected to play important roles in fundamental physics research, global positioning systems, precision measurements, and other fields.
Since the beginning of the 21st century, the rapid development of precision industrial manufacturing and space technology has imposed stringent requirements on the accuracy and scale of absolute distance measurement. Many large-scale precision measurement tasks, such as measuring the inner and outer diameters of large workpieces, positioning large communication antennas, and satellite formation flying in space, require absolute distance measurements with sub-micron accuracy, or even nanometer accuracy, over measurement ranges from a few meters to several thousand meters. This level of precision is difficult to achieve with traditional laser measurement methods.
Optical frequency combs can provide a series of equally spaced, highly stable frequency lines. Therefore, in the field of biochemical substance detection, optical frequency combs can be used for high-sensitivity and high-selectivity spectral analysis. By analyzing the absorption or emission characteristics of biochemical substances at specific frequencies of light, qualitative and quantitative analysis of substances can be performed. Since the detection process does not alter or damage the biochemical substances being tested, the detection using optical frequency combs is non-destructive. This makes it significantly applicable in spectral analysis. Moreover, due to the high frequency stability and ultra-low phase noise of optical frequency comb technology, it demonstrates high sensitivity when detecting weak signals, making it suitable for trace biochemical substance detection.
Hotline:
Add：405,Unit 2,Building 7,the CEC Intelligent Manufacturing Park,Changsha,Hunan Province, China.
Official Account
Bilibili