Microrod compression of laser beam in combination with transmit lens

  • US 9,086,273 B1
  • Filed: 03/08/2013
  • Issued: 07/21/2015
  • Est. Priority Date: 03/08/2013
  • Status: Active Grant
First Claim
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1. A light detection and ranging (LIDAR) device, comprising:

  • at least one laser diode, wherein the at least one laser diode is configured to emit an uncollimated laser beam comprising light in a narrow wavelength range, wherein the uncollimated laser beam has a first divergence in a first direction and a second divergence in a second direction, and wherein the first divergence is greater than the second divergence;

    at least one cylindrical lens, wherein the at least one cylindrical lens is configured to pre-collimate the uncollimated laser beam in the first direction to provide a partially collimated laser beam that has a third divergence in the first direction and a fourth divergence in the second direction, wherein the third divergence is less than the fourth divergence and the fourth divergence is substantially equal to the second divergence;

    at least one detector, wherein the at least one detector is configured to detect light having wavelengths in the narrow wavelength range; and

    an objective lens, wherein the objective lens is configured to (i) collimate the partially collimated laser beam to provide a collimated laser beam for transmission into an environment of the LIDAR device and (ii) focus object-reflected light onto the at least one detector, wherein the object-reflected light comprises light from the collimated laser beam that has reflected from one or more objects in the environment of the LIDAR device.

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