Movable E-15 magnitude ultra-stable laser comparison test system

Abstract

The invention discloses a movable E-15 magnitude ultra-stable laser comparison test system, which relates to the technical field of optical metrology and comprises a PDH laser frequency stabilization unit, a beat frequency unit, matched test equipment and a computer. An output optical signal of a to-be-tested PDH system is directly connected to a beat frequency module in a cabinet, beat frequency is carried out on the output optical signal and original PDH laser of the cabinet in the beat frequency module, a radio frequency signal obtained after beat frequency can be respectively accessed to a frequency counter and a frequency spectrograph, and a signal processed by the frequency counter and the frequency spectrograph can be accessed to a computer. And finally, indexes such as frequency stability and line width can be directly read through a software control end of a computer.

Description

Technical Field

[0001] This invention relates to the field of optical metrology, and more specifically, to a portable E-15 level ultra-stable laser comparison and testing system. Background Technology

[0002] In fields such as precision measurement and atomic frequency standards, Pound-Drever-Hall ultra-stable cavity technology is often required to obtain lasers with ultra-high frequency stability and ultra-narrow linewidth. Currently, most ultra-stable laser comparison and testing systems are fixed on laboratory benches and lack portability. Summary of the Invention

[0003] The purpose of this invention is to provide a portable E-15 level ultra-stable laser comparison and testing system that can overcome the above-mentioned defects of existing systems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On the one hand, this specification provides a portable E-15 level ultra-stable laser comparison and testing system, including a PDH laser frequency stabilization unit, a beat frequency unit, supporting testing equipment and a computer.

[0006] Preferably, the PDH laser frequency stabilization unit includes an optical path unit, a physical unit, a vibration isolation platform, a sound insulation unit, and a circuit unit.

[0007] Preferably, the beat frequency module has two signal inputs, which are respectively connected to two PDH frequency-stabilized lasers. The radio frequency signal obtained after beat frequency can be connected to a frequency counter and a spectrum analyzer respectively. The signal processed by the frequency counter and the spectrum analyzer can be connected to a computer. Finally, the frequency stability and linewidth and other indicators can be directly read through the software control terminal of the computer.

[0008] Preferably, the supporting testing equipment includes, but is not limited to, a frequency counter and a spectrum analyzer.

[0009] Based on the above technical solution, this specification can achieve the following technical effects:

[0010] The aforementioned portable E-15-level ultra-stable laser comparison and testing system can directly connect the output optical signal of the PDH system under test to the beat frequency module in the cabinet, and beat the original PDH laser in the cabinet in the beat frequency module. The radio frequency signal obtained after beat frequency can be connected to the frequency counter and the spectrum analyzer respectively. The signal processed by the frequency counter and the spectrum analyzer can be connected to the computer, and finally the frequency stability and linewidth and other indicators can be directly read through the software control terminal of the computer. Attached Figure Description

[0011] Figure 1This is a flowchart illustrating the design of the portable E-15 level ultra-stable laser comparison and testing system described in this invention.

[0012] Figure 2 This is a schematic diagram of the product cabinet design for the portable E-15 level ultra-stable laser comparison and testing system described in this invention. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not to a precise scale, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0014] It should be noted that, in order to clearly illustrate the content of this invention, several embodiments are provided to further explain different implementations of the invention. These embodiments are enumerated rather than exhaustive. Furthermore, for the sake of brevity, content mentioned in the preceding embodiments is often omitted in the following embodiments. Therefore, content not mentioned in the later embodiments can be referred to in the preceding embodiments.

[0015] Please refer to Figures 1 to 2 One embodiment of this specification provides a portable E-15 level ultra-stable laser comparison and testing system, including a PDH laser frequency stabilization unit, a beat frequency unit, supporting testing equipment, and a computer.

[0016] like Figure 2 As shown, a portable E-15-level ultra-stable laser comparison and testing system is designed. This system is a cabinet-type product integrating a PDH laser frequency stabilization module, a beat frequency module, a frequency counter, a spectrum analyzer, and a computer. For a PDH system under test with a wavelength similar to the PDH laser frequency stabilization module, the output optical signal of the PDH system under test can be directly connected to the beat frequency module in the cabinet. The signal is then beat-matched with the existing PDH laser in the cabinet. The resulting radio frequency signal can be connected to the frequency counter and the spectrum analyzer, respectively. The processed signals can then be connected to the computer, and finally, the frequency stability and linewidth, among other parameters, can be directly read through the computer's software control.

[0017] Frequency stability is obtained by calculating the Allan deviation of the beat frequency signal. The formula for calculating the Allan variance is as follows:

[0018]

[0019] in, τ represents the measurement interval of the data. The average relative frequency deviation represents the time interval τ, which is the measurement value of the frequency meter, and M represents the number of samples.

[0020] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A portable E-15 level ultra-stable laser comparison and testing system, characterized in that, It includes a PDH laser frequency stabilization unit, a beat frequency unit, supporting testing equipment, and a computer.

2. The portable E-15 level ultra-stable laser comparison and testing system according to claim 1, characterized in that, The PDH laser frequency stabilization unit includes an optical path unit, a physical unit, a vibration isolation platform, a sound insulation unit, and a circuit unit.

3. The portable E-15 level ultra-stable laser comparison and testing system according to claim 2, characterized in that, The beat frequency module has two signal inputs, which are connected to two PDH frequency-stabilized lasers respectively. The radio frequency signal obtained after beat frequency can be connected to a frequency counter and a spectrum analyzer respectively. The signal processed by the frequency counter and spectrum analyzer can be connected to a computer. Finally, the frequency stability and linewidth and other indicators can be directly read through the software control terminal of the computer.

4. The portable E-15 level ultra-stable laser comparison and testing system according to claim 3, characterized in that, The supporting testing equipment includes a frequency counter and a spectrum analyzer.

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