External cavity tunable laser and wavelength tuning method
A technology for tuning lasers and wavelengths, applied in the field of lasers, can solve problems such as slow tuning speed, achieve the effects of reducing impact, avoiding frequent use, and realizing tuning
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0050] According to one aspect of the present invention, a kind of external cavity tunable laser based on Littman structure is provided, such as figure 1 and figure 2 shown, including:
[0051] The semiconductor gain chip 1, the first collimating lens 2, the blazed grating 3 and the mirror 4 opposite to the blazed grating 3 are placed in sequence; the semiconductor gain chip 1, the first collimating lens 2 and the blazed grating 3 are located on the same optical axis , and there is an angle greater than 0 between the grating plane of the blazed grating 3 and the optical axis; wherein, the semiconductor gain chip 1 includes the sampling grating area 10, the phase modulation area 11, the gain area 12 and the The sampling...
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