# US 2022/0035152 A1 · Laser stabilizing system and laser source module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0035152 A1 - Document ID: US20220035152A1 - Status: Published application - Kind: A1 - Application number: 17/019,374 - Filed: 2020-09-14 - Published: 2022-02-03 - Earliest claimed: 2020-07-29 - Assignees: National Cheng Kung University - Applicants: National Cheng-Kung University - Inventors: Chien-Sheng Liu; Yu-Hao Chang; Chih-Hao Tsai - Web page: https://patentgrep.com/patent/US20220035152A1 ## CPC - H01S 3/1305: {Feedback control systems} - G02B 26/085: {the reflecting means being moved or deformed by electromagnetic means} - G02B 26/0883: {the refracting element being a prism} - G02B 27/0068: {having means for controlling the degree of correction, e.g. using phase modulators, movable elements (controlling the phase of light using moving or deformable elements G02B26/06)} - G02B 27/648: {for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments (surveying instruments per se G01C)} - H01S 3/0014: {Monitoring arrangements not otherwise provided for (photometry G01J1/00, e.g. G01J1/4257; radiation pyrometry G01J5/00; measuring coherence of light G01J9/00; measuring wavelength of light G01J9/00, e.g. G01J9/0246; measuring optical pulses G01J11/00; calorimetrically measuring power of laser beams G01K17/003)} - H01S 3/0071: {Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction} - H01S 3/101: Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted - G02B 26/0891: {forming an optical wedge} - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A laser stabilizing system configured to stabilize a laser beam emitted from a laser source includes a beam steering device, a first beam splitter, a first light detector, a second beam splitter, and a second light detector. The beam steering device is configured to steer a direction and a position of the laser beam in four or more degrees of freedom. The first beam splitter is configured to split the laser beam from the beam steering device into a first partial beam and a second partial beam. The first light detector is disposed on a transmission path of the first partial beam. The second beam splitter is configured to split the second partial beam into a third partial beam and a fourth partial beam. The second light detector is disposed on a transmission path of the third partial beam. A laser source module is also provided. ## Claims ### Claim 1 A laser stabilizing system configured to stabilize a laser beam emitted from a laser source, the laser stabilizing system comprising: a beam steering device disposed on a path of the laser beam and configured to steer a direction and a position of the laser beam in four or more degrees of freedom; a first beam splitter disposed on a path of the laser beam from the beam steering device and configured to split the laser beam into a first partial beam and a second partial beam; a first light detector disposed on a transmission path of the first partial beam; a second beam splitter disposed on a transmission path of the second partial beam and configured to split the second partial beam into a third partial beam and a fourth partial beam; and a second light detector disposed on a transmission path of the third partial beam. ### Claim 2 (depends on 1) The laser stabilizing system according to claim 1, wherein the beam steering device comprises: a first prism having a first inclined reflecting surface; and a second prism having a second inclined reflecting surface, wherein the laser beam is sequentially reflected by the first inclined reflecting surface and the second inclined reflecting surface, the first inclined reflecting surface is parallel to a first axial direction, the second inclined reflecting surface is parallel to a second axial direction, the first inclined reflecting surface is inclined with respect to a direction in which the laser beam is incident on the first inclined reflecting surface, and the second inclined reflecting surface is inclined with respect to a direction in which the laser beam is emitted from the second inclined reflecting surface. ### Claim 3 (depends on 2) The laser stabilizing system according to claim 2, wherein the first axial direction is perpendicular to the second axial direction. ### Claim 4 (depends on 2) The laser stabilizing system according to claim 2, wherein the beam steering device further comprises a motor, and the first prism and the second prism are disposed in the motor so as to be controlled by the motor in direction and position. ### Claim 5 (depends on 4) The laser stabilizing system according to claim 4, wherein the first prism and the second prism are disposed in a single motor, and the single motor is a motor capable of controlling in four or more degrees of freedom. ### Claim 6 (depends on 2) The laser stabilizing system according to claim 2, wherein the first prism further has a third inclined reflecting surface inclined with respect to the first inclined reflecting surface and parallel to the first axial direction, and the second prism further has a fourth inclined reflecting surface inclined with respect to the second inclined reflecting surface and parallel to the second axial direction, wherein the laser beam is sequentially reflected by the first inclined reflecting surface, the third inclined reflecting surface, the second inclined reflecting surface, and the fourth inclined reflecting surface, the third inclined reflecting surface is inclined with respect to a direction in which the laser beam is incident on the third inclined reflecting surface, and the fourth inclined reflecting surface is inclined with respect to a direction in which the laser beam is emitted from the fourth inclined reflecting surface. ### Claim 7 (depends on 2) The laser stabilizing system according to claim 2, wherein the beam steering device further comprises a diffusion sheet disposed on the path of the laser beam, located on one side of the first prism and the second prism, and configured to diffuse the laser beam. ### Claim 8 (depends on 7) The laser stabilizing system according to claim 7, wherein the beam steering device further comprises a motor, the first prism and the second prism are disposed in the motor so as to be controlled by the motor in direction and position, the diffusion sheet is connected to the motor, and the motor drives the diffusion sheet to rotate. ### Claim 9 (depends on 1) The laser stabilizing system according to claim 1, further comprising a controller electrically connected to the first light detector, the second light detector, and the beam steering device and configured to calculate, according to a position of a light spot formed by the first partial beam on the first light detector measured by the first light detector and a position of a light spot formed by the third partial beam on the second light detector measured by the second light detector, an angle and a position required to be compensated for the laser beam, and transmit a control signal to the beam steering device, so that the beam steering device compensates the angle and the position for the laser beam. ### Claim 10 (depends on 9) The laser stabilizing system according to claim 9, wherein the first light detector and the second light detector are both image sensors. ### Claim 11 A laser source module comprising: a laser source configured to emit a laser beam; a beam steering device disposed on a path of the laser beam and configured to steer a direction and a position of the laser beam in four or more degrees of freedom; a first beam splitter disposed on a path of the laser beam from the beam steering device and configured to split the laser beam into a first partial beam and a second partial beam; a first light detector disposed on a transmission path of the first partial beam; a second beam splitter disposed on a transmission path of the second partial beam and configured to split the second partial beam into a third partial beam and a fourth partial beam; and a second light detector disposed on a transmission path of the third partial beam. ### Claim 12 (depends on 11) The laser source module according to claim 11, wherein the beam steering device comprises: a first prism having a first inclined reflecting surface; and a second prism having a second inclined reflecting surface, wherein the laser beam is sequentially reflected by the first inclined reflecting surface and the second inclined reflecting surface, the first inclined reflecting surface is parallel to a first axial direction, the second inclined reflecting surface is parallel to a second axial direction, the first inclined reflecting surface is inclined with respect to a direction in which the laser beam is incident on the first inclined reflecting surface, and the second inclined reflecting surface is inclined with respect to a direction in which the laser beam is emitted from the second inclined reflecting surface. ### Claim 13 (depends on 12) The laser source module according to claim 12, wherein the first axial direction is perpendicular to the second axial direction. ### Claim 14 (depends on 12) The laser source module according to claim 12, wherein the beam steering device further comprises a motor, and the first prism and the second prism are disposed in the motor so as to be controlled by the motor in direction and position. ### Claim 15 (depends on 14) The laser source module according to claim 14, wherein the first prism and the second prism are disposed in a single motor, and the single motor is a motor capable of controlling in four or more degrees of freedom. ### Claim 16 (depends on 12) The laser source module according to claim 12, wherein the first prism further has a third inclined reflecting surface inclined with respect to the first inclined reflecting surface and parallel to the first axial direction, and the second prism further has a fourth inclined reflecting surface inclined with respect to the second inclined reflecting surface and parallel to the second axial direction, wherein the laser beam is sequentially reflected by the first inclined reflecting surface, the third inclined reflecting surface, the second inclined reflecting surface, and the fourth inclined reflecting surface, the third inclined reflecting surface is inclined with respect to a direction in which the laser beam is incident on the third inclined reflecting surface, and the fourth inclined reflecting surface is inclined with respect to a direction in which the laser beam is emitted from the fourth inclined reflecting surface. ### Claim 17 (depends on 12) The laser source module according to claim 12, wherein the beam steering device further comprises a diffusion sheet disposed on the path of the laser beam, located on one side of the first prism and the second prism, and configured to diffuse the laser beam. ### Claim 18 (depends on 17) The laser source module according to claim 17, wherein the beam steering device further comprises a motor, the first prism and the second prism are disposed in the motor so as to be controlled by the motor in direction and position, the diffusion sheet is connected to the motor, and the motor drives the diffusion sheet to rotate. ### Claim 19 (depends on 11) The laser source module according to claim 11, further comprising a controller electrically connected to the first light detector, the second light detector, and the beam steering device and configured to calculate, according to a position of a light spot formed by the first partial beam on the first light detector measured by the first light detector and a position of a light spot formed by the third partial beam on the second light detector measured by the second light detector, an angle and a position required to be compensated for the laser beam, and transmit a control signal to the beam steering device, so that the beam steering device compensates the angle and the position for the laser beam. ### Claim 20 (depends on 19) The laser source module according to claim 19, wherein the first light detector and the second light detector are both image sensors.