Application of Piezo Fiber Phase Modulator in Adaptive Optics Synthetic Aperture

 In recent years, the optical synthetic aperture imaging technology has developed rapidly. It is a high-resolution imaging technology that uses multiple small aperture systems to synthesize a large aperture system through optical means. Optical synthetic aperture imaging technology makes the entire imaging system smaller and lighter. Therefore, it is also an important direction for the development of ground-based and space-based large-scale telescope systems.

In the adaptive optics synthetic aperture imaging remote sensor system, factors such as the environment or the vibration of the carrier platform will cause the phase error of each sub-aperture in the synthetic aperture array, which will cause the image quality to deteriorate. Therefore, the improvement of imaging quality requires real-time measurement and correction of phase errors. CoreMorrow's piezoelectric ceramic fiber phase modulator can meet these requirements.

Principle and Composition of Optical Synthetic Aperture Imaging Technology

Optical synthetic aperture imaging technology is to arrange multiple small-aperture optical mirrors or optical systems according to a certain spatial position. Through the adjustment and phase matching of optical paths and mirrors, the beams passing through each sub-aperture meet the requirements of the same phase on the common focal plane so as to achieve the coherent superposition of the light field and the diffraction resolution of a single large-aperture system equivalent to the aperture of the light.

According to wave optics theory, the angular resolution of traditional optical imaging systems is limited by wavelength and system aperture. For a certain working band, if you want to improve the angular resolution of the system, you can only increase the system aperture. In practical applications, many factors limit the increase of the system aperture. The purpose of optical synthetic aperture imaging technology is to synthesize a large aperture system through optical means with a small aperture system that is easier to manufacture, so as to meet the requirements of high-resolution imaging.

Schematic diagram of redundancy correction of adaptive optics synthetic aperture imaging remote sensor

The figure above shows the schematic diagram of the redundant interval correction of the adaptive optics synthetic aperture imaging remote sensor. The system selects piezoelectric ceramic optical fiber phase modulators for real-time phase correction. Each optical fiber phase modulator used for phase correction in the optical fiber reduction array is fixed in front of the optical device for instantaneous redundant information phase difference measurement, and then passes through the back lens group, finally imaging on the CCD, and the information used for redundant interval correction can be extracted from the image. The piezoelectric ceramic fiber phase modulator is controlled by the computer to complete the real-time correction of the phase, so as to achieve real-time high-quality imaging.

As can be seen from the above figure, after the adaptive optics synthetic aperture imaging remote sensor is affected by the external environment and the carrier platform vibrates, there will be a phase error between the two apertures of the optical fiber reduction array. The optical phase difference measurement of the instantaneous redundant information is made after the error signal measured by the device, the system corrects the phase error by driving and controlling the piezoelectric ceramic optical fiber phase modulator.

CoreMorrow produces and sells diversified PZT piezoelectric ceramic optical fiber phase modulators, which can be divided into large output type, large displacement type, small volume type, low temperature type, etc., which are suitable for various optical fiber phase modulation applications. The CoreMorrow PZT piezoelectric ceramic optical fiber phase modulator uses the inverse piezoelectric effect of piezoelectric ceramics. The piezoelectric ceramic controller adjusts the voltage value applied to the PZT piezoelectric ceramic to control the length of the fiber being stretched. In addition, the size of the driving voltage is basically linear with the length of the fiber being stretched, which is very easy to control.

Coremorrow PZT Piezoelectric Fiber Phase Modulator

CoreMorrow PZT piezoelectric optical fiber phase modulator is very simple to use. The fiber is wound around the PZT optical fiber phase modulator. The PZT optical fiber phase modulator generates radial expansion and causes the outer diameter and circumference to change, making the length of the wound fiber and the refractive index changes, which causes the phase change of the output light.

The following is a brief introduction to the parameters of several PZT piezoelectric ceramic optical fiber phase modulators produced and sold by CoreMorrow, but for different types of optical fibers (such as diameter, flexibility, required tensile force and other parameters), the parameter values will vary slightly.

Large Displacement Piezoelectric Optical Fiber Phase Modulator

piezo optical fiber phase modulator from CoreMorrow

Model: H01.80
Radial displacement: 80μm
Stretching length of optical fiber: 420μm/circle of optical fiber
Radial output: 160N
No-load harmonic frequency: 740Hz

 

Large Output, High Harmonic Frequency Piezoelectric Optical Fiber Phase Modulator

Piezoelectric Optical Fiber Phase Modulator

Model: H01.20
Radial displacement: 18.5μm
Stretching length of optical fiber: 100μm/circle of optical fiber
Radial output: 600N
No-load harmonic frequency: 3975Hz

 

Low-Temperature Piezoelectric Optical Fiber Phase Modulator

Piezoelectric Optical Fiber Phase Modulator

Model: H01.6
Radial displacement: 7μm
Stretching length of optical fiber: 35μm/circle of optical fiber
Radial output: 250N
No-load harmonic frequency: 9500Hz

 

Small-Size Piezoelectric Optical Fiber Phase Modulator

Piezoelectric Optical Fiber Phase Modulator

Model: H01.9
Fiber extension length: 18μm/cirecle of fiber
Open loop resolution: 0.1nm
Weight: 14g
Size: 28×10×8mm^3

Ring Piezoelectric Ceramic Fiber Phase Modulator

Ring Piezoelectric Ceramic Fiber Phase Modulator

Features: Various sizes, customizable.

For more fiber phase modulator solutions, please feel free to contact us and inform us of your requirements, and we will tailor a fiber phase modulator solution for you.

Original link: http://www.coremorrow.com/en/newsshow-66-723-1.html