Nonlinear gain modulation optical frequency comb and generating method thereof
An optical frequency comb and nonlinear technology, applied in the field of optical frequency combs, can solve the problems of increasing the technical complexity of frequency comb systems, long-term stability risks, etc., and achieve great practical value and application prospects, flexible wavelengths, and laser pulse energy. big effect
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Embodiment 1
[0026] Example 1, see figure 1 .
[0027] figure 1 It is a schematic block diagram of the structure of the nonlinear gain modulation optical frequency comb of the present invention. The single-frequency continuous optical signal source 1 has a center wavelength of 1120nm and a line width of -1. The 1120nm single-frequency continuous light and the 1064nm ultrashort pulse laser are coupled into the Raman gain fiber through a 1064nm / 1120nm wavelength division multiplexer. The output laser is converted into 1120nm ultrashort pulse laser through the above system, which is divided into two paths: one path contains most of the energy and is used as the main output of the frequency comb; the other path is a small part of the output laser coupled to the repetition rate feedback control unit 4 (by Photodiode, microwave frequency conversion link, PID controller). The output control signal is fed back to the ultrashort pulse laser pump source to lock its repetition rate in real time. ...
Embodiment 2
[0029] figure 2 It is a schematic block diagram of the multi-wavelength signal injection and cascaded nonlinear gain modulation optical frequency comb of the present invention. Through multi-wavelength signal injection, cascaded, wavelength-flexible frequency comb output can be realized. The central wavelengths of the single-frequency continuous optical signal source 11 , the single-frequency continuous optical signal source 12 , and the single-frequency continuous optical signal source 13 are 1120 nm, 1178 nm, and 1238 nm, respectively, and the line width is -1 . The single-frequency continuous light and the ultrashort pulse laser are coupled into the Raman gain fiber through a wavelength division multiplexer. After the nonlinear gain modulation of the Raman fiber, the 1064nm pump pulse is first converted into a 1120nm first-order Stokes Raman pulse; then the 1120nm pulse is further converted into a 1178nm second-order Stokes Raman pulse; and so on, it can be cascaded all t...
Embodiment 3
[0031] image 3 It is a schematic block diagram of the structure of the non-linear gain modulation optical frequency comb in the semi-stable locked state of the present invention. The actual application environment of some frequency combs does not require locking the carrier envelope phase offset frequency (such as dual-comb spectral detection or dual-comb ranging applications that do not require high measurement accuracy). Therefore, for these applications, the optical frequency reference 5 can be removed on the basis of Embodiment 1, and other structures remain unchanged. In this way, the cost of the device of the present invention can be further reduced, and its application environment and field can be expanded. This is a semi-stable comb solution with low cost, flexible wavelength and simple structure.
[0032] It should be pointed out that in Embodiment 2, the wavelength division multiplexer 14 is only for the convenience of distinguishing the single-frequency continuou...
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Abstract
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