Grating outer-cavity laser and quasi-synchronization tuning method thereof

A synchronous tuning and quasi-synchronous technology, applied to the device for controlling the output parameters of the laser, the structure of the optical resonator, etc., can solve the problems of mechanical system complexity, disadvantages, difficulties, etc.

Inactive Publication Date: 2015-06-03
NAT INST OF METROLOGY CHINA
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Problems solved by technology

This limitation makes the structural design, adjustment and application of the laser very unfavorable and difficult, and at the same time causes the complexity of the mechanical system and increases the instability factor

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  • Grating outer-cavity laser and quasi-synchronization tuning method thereof
  • Grating outer-cavity laser and quasi-synchronization tuning method thereof
  • Grating outer-cavity laser and quasi-synchronization tuning method thereof

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Embodiment Construction

[0079] The present invention is based on the discovery that in the above formula ψ=ψ 0 In the tuning phase change described by +A(α)·[B·sinα+C·(l-cosα)], the tuning rotation angle α is a tiny amount that is much smaller than 1 and close to zero when expressed in radians. According to the Taylor series expansion theorem, it can be seen that the first term sinα in the square brackets of Formula 1 is an odd-order higher-order term starting from the first-order term of the tuning rotation angle α, and the second term (1-cosα) is from the tuning rotation angle α The even-order higher-order term starting from the second-order term of angle α, which is a tiny quantity higher order than sin α, contributes much less to the round-trip phase change ψ than sin α. Therefore, if the phase change caused by the second term is smaller than the allowable phase change without mode hopping, a first-order approximation can be made to the round-trip phase change ψ, that is, the second-order term an...

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Abstract

The invention provides a quasi-synchronization tuning method for the laser wavelength or frequency of a grating outer-cavity laser, and also provides a corresponding laser. One quasi-synchronization tuning point (Pq) serves as a rotating center to rotate a grating or a reflecting mirror so as to realize the quasi-synchronization tuning of the frequency-selecting action of the grating and a resonant cavity. From the practical physical space of the laser, on an xOy coordinate plane, a rotation center Pq(xq, yq) satisfying the quasi-synchronization tuning condition can be seen as that a rotation center P0 (x0,y0) is expanded to an area contained by two parabolas near the P0 point under the common quasi-synchronization tuning condition. According to the method, lasers can be approximately and synchronously tuned by a simple and flexible design.

Description

technical field [0001] The present invention relates to the tuning of the laser wavelength or frequency of a grating external cavity laser, wherein quasi-synchronous tuning is achieved when selecting the tuning rotation center of the grating or mirror. Background technique [0002] In the grating external cavity laser, it is often necessary to tune the wavelength or frequency of the generated laser. This tuning is to change the incident angle and diffraction angle of the light on the grating by rotating the grating, or to change the angle of light on the grating by rotating the mirror. The diffraction angle is achieved. [0003] exist figure 1 , figure 2 and image 3 Three types of grating external-cavity semiconductor lasers are shown in . in figure 1 Shown is a conventional external cavity semiconductor laser with grazing incidence (that is, the angle of incidence is greater than the angle of diffraction), which is also called the Littman structure; figure 2 What i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/14H01S5/06
Inventor 王少凯臧二军李烨曹建平方占军
Owner NAT INST OF METROLOGY CHINA
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