Systems and methods for calibrating laser pulses

Patent metadata

Field	Value
Publication number	US-12419684-B2
Application number	US-202217664306-A
Country	US
Kind code	B2
Filing date	May 20, 2022
Priority date	May 21, 2021
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A medical laser system for outputting laser pulses includes at least one laser cavity configured to generate at least one laser pulse, a rotating mirror configured to receive and reflect the at least one laser pulse, a beam splitter configured to receive and reflect a portion of the at least one laser pulse received from the rotating mirror, an energy-sensing device configured to detect the portion of the at least one laser pulse, an energy measurement assembly configured to generate a measurement signal based on the portion of the at least one laser pulse detected by the energy-sensing device, and a controller. The controller may include a calibration module. The calibration module may be configured to generate at least one categorized calibration table, determine calibration parameters, interpolate the calibration parameters, and cause the at least one laser cavity to generate at least one calibrated laser pulse.

First claim

What is claimed is:

1. A medical laser system for outputting laser pulses, the system comprising:
at least one laser cavity configured to generate at least one laser pulse;
a rotating mirror configured to receive and reflect the at least one laser pulse;
a beam splitter configured to receive and reflect a portion of the at least one laser pulse received from the rotating mirror;
an energy-sensing device configured to detect the portion of the at least one laser pulse;
an energy measurement assembly configured to generate a measurement signal based on the portion of the at least one laser pulse detected by the energy-sensing device; and
a controller comprising a calibration module configured to:
generate at least one categorized calibration table based on a spectrum matrix;
determine calibration parameters for the at least one categorized calibration table based on the measurement signal;
interpolate the calibration parameters of the at least one categorized calibration table; and
cause the at least one laser cavity to generate at least one calibrated laser pulse based on the at least one categorized calibration table with interpolated calibration parameters.

2. The system of claim 1 , wherein the controller further comprises:
a memory comprising the spectrum matrix and the categorized calibration table.

3. The system of claim 1 , wherein the at least one categorized calibration table is generated based on one or more laser pulse modes, the one more laser pulse modes including at least one of a regular-low pulse mode, a short-low pulse mode, a long-low pulse mode, a regular-medium pulse mode, a short-medium pulse mode, a long-medium pulse mode, a short-high pulse mode, a long-high pulse mode, a dust pulse mode, or a burst pulse mode.

4. The system of claim 1 , wherein the calibration parameters of the at least one categorized calibration table is interpolated based on a Newtonian interpolation algorithm.

5. The system of claim 1 , wherein the calibration parameters include at least one of a target energy measurement value or a pulse width value of the at least one laser pulse.

6. The system of claim 1 , wherein the at least one laser pulse is generated by one of the at least one laser cavity.

7. The system of claim 6 , wherein interpolated calibration parameters of the at least one categorization calibration table is transferred to another categorization calibration table associated with another one of the at least one laser cavity.

8. The system of claim 1 , wherein the calibration module is further configured to:
interpolate the calibration parameters of the at least one categorized calibration table based on one or more laser pulse energy levels and one or more laser pulse repetition rates.

9. The system of claim 1 , wherein the calibration module is further configured to:
compare the calibration parameters to a predetermined accuracy threshold; and
determine whether the calibration parameters satisfy the predetermined accuracy threshold.

10. The system of claim 9 , wherein the calibration module is further configured to:
upon determining the calibration parameters does not satisfy the predetermined accuracy threshold, adjusting the at least one of the calibration parameters; and
comparing the at least one of the calibration parameters to the predetermined accuracy threshold.

11. The system of claim 1 , wherein the at least one laser cavity comprises four laser cavities.

12. The system of claim 1 , wherein each of the at least one laser cavity comprises a glass plate arranged at a Brewster Angle.

13. The system of claim 1 , wherein the beam splitter comprises a polarization-insensitive coating.

Assignees

• Boston Scient Scimed Inc

Inventors

• Yang Baocheng
• Pih David
• Yang Xirong
• Bull Peter
• Cheng Brian
• Xuan Rongwei Jason
• Zhang Jian James
• Hasenberg Thomas Charles

Classifications

• H01S3/1643

  YAG · CPC title

• H01S3/1623

  chromium, e.g. Alexandrite · CPC title

• H01S3/1616

  thulium · CPC title

• H01S3/161

  holmium · CPC title

• H01S3/1305

  Feedback control systems · CPC title