Laser device and gyroscope
A technology of gyroscopes and lasers, which is applied in the direction of lasers, laser parts, Sagnac effect gyroscopes, etc., and can solve the problem that ring laser gyroscopes are not suitable for rotation directions, etc.
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Embodiment 1
[0133] In a first embodiment of the gyroscope according to the invention, the gyroscope comprises a laser device driven to generate first and second laser beams propagating clockwise and counterclockwise, respectively, when the laser device remains stationary The first and second beams are of different frequencies and the resulting electrical signals are extracted therefrom.
[0134] The first and second laser beams (the CW beam and the CCW beam) may be generated by the laser device with an asymmetric tapered region formed on at least a portion of the laser device optical waveguide.
[0135] Specifically, refer to figure 2 , the asymmetric tapered region 1200 is disposed in the optical waveguide 1201 of the embodiment. exist figure 2 In , reference numeral 1202 denotes a CW beam and reference numeral 1203 denotes a CCW beam, while reference numeral 1204 denotes a mirror (more precisely, its reflecting surface). By forming an asymmetric tapered region in this way, a differ...
Embodiment 2
[0174] A gyroscope according to a second embodiment of the present invention includes a laser device and a photodetector for detecting a CW beam and a CCW beam emitted from the laser device and interfering with each other, the oscillation frequencies of the two beams being unequal to each other .
[0175] The difference between the second embodiment and the above-mentioned first embodiment is that the photodetector is arranged outside the laser device and the rotation of the laser device is detected by the change of the electric signal of the photodetector.
[0176] Now, refer to Figure 17 The second embodiment will be described in detail.
[0177] exist Figure 17 In , reference numerals 2702 and 2703 denote CW beams and CCW beams, respectively, reference numeral 2701 denotes an optical waveguide, while reference numeral 2700 denotes an asymmetric tapered region and reference numerals 2704 and 2714 denote mirrors, respectively. Reference numeral 2730 denotes a photodetect...
example 1
[0247] Figure 30 and 31 is a schematic diagram of the first example of the invention, most clearly showing its characteristics. refer to Figure 30 , the laser device of this example is a ring resonator type semiconductor laser 4001 including an asymmetric tapered region 4000 of its optical waveguide. refer to Figure 31 , also represents the laser device of this example, which additionally includes an anode 4103, an electrical terminal 4124, a top layer 4121, a cover layer 4106, an optical guiding layer 4122, an active layer 4101, another optical guiding layer 4123, a semiconductor substrate 4102 and a cathode 4104. Reference numeral 4003 denotes a laser beam propagating counterclockwise annularly, and reference numeral 4002 denotes a laser beam propagating clockwise. Notice Figure 31 yes Figure 30 laser equipment along Figure 30 A schematic cross-sectional view of the line X-X' in.
[0248] First, a method of manufacturing a ring resonator type semiconductor lase...
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