Lidar having wavelength locking function
AssigneeMitsubishi Electric Corporation
InventorsHidenobu TSUJI, Shumpei KAMEYAMA
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Abstract
A LIDAR according to the technology of the present disclosure includes: a laser light source to oscillate laser light; a beam splitter to split the laser light into two systems; a modulator to modulate a phase of the laser light sent from the beam splitter; a gas cell; a photodetector to detect transmitted laser light having transmitted through the gas cell, and convert the transmitted laser light into an electrical signal; and a wavelength controller to control a wavelength of the laser light source, the laser light source is temperature-controllable, and the LiDAR further includes a target spectrum detector to perform temperature sweep control and constant temperature control on the laser light source.
Claims3
A LiDAR comprising:
- a laser light source to oscillate laser light;
- a beam splitter to split the laser light into two systems;
- a modulator to modulate a phase of the laser light sent from the beam splitter;
- a gas cell;
- a photodetector to detect transmitted laser light having transmitted through the gas cell, and convert the transmitted laser light into an electrical signal;
- and
- a wavelength controller to control a wavelength of the laser light source by current control loop,
- wherein,
- the laser light source is temperature-controllable, and
- the LiDAR further comprises a target spectrum detector to perform temperature sweep control and constant temperature control on the laser light source,
- and wherein,
- in the temperature sweep control, the target spectrum detector sweeps the temperature,
- determines the wavelength of the spectral peak with the lowest transmittance,
- determines the wavelength of the spectral peak, the wavelength being in the side where wavelength get shorter and being the target to be tuned,
- sets the temperature corresponding to the wavelength of the spectral peak to be tuned,
- and then, performs the constant temperature control.
A LIDAR comprising a laser light source to be able to control a temperature,
- the LiDAR comprises a target spectrum detector to perform temperature sweep control and constant temperature control on the laser light source,
- wherein,
- as a consequence of the target spectrum detector performing temperature sweep control, and then, performing the constant temperature control,
- the temperature of the laser light source rises from 0[° C.] to 60[° C.] at a speed of 6 to 60[° C./min] once, and then drops from 60[° C.] to 0[° C.] at a speed of 6 to 60[° C./min],
- the temperature decreases from temperature-A to temperature-B and then becomes constant, temperature-A being the temperature corresponding to the peak with the lowest transmittance when the laser beam passes through the gas cell, temperature-B being the temperature corresponding to the wavelength of the spectral peak to be tuned.
Dependencies are inferred from the claim text.