Apparatus and method for laser diode calibration

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By reversely biasing the photodiode in the laser irradiation device and maintaining the reference voltage by using a variable resistor, the complex and time-consuming calibration of the laser irradiation device in the prior art is solved, and a more efficient calibration process is achieved.

CN119674695APending Publication Date: 2025-03-21HONEYWELL INTERNATIONAL INC

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Patent Information

Application Number: CN202411221382.0
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Priority Date: 2023-09-20
Filing Date: 2024-09-02
Publication Date: 2025-03-21

Application Information

Patent Timeline

20 Sep 2023

Priority

02 Sep 2024

Application

CN202411221382.0

21 Mar 2025

Publication

CN119674695A

IPC: H01S5/026; H01S5/068

CPC: H01S5/0617; H01S5/0683; H01S5/04256; H01S5/0262

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Application Domain

Laser details Semiconductor lasers

Technology Topics

Photo irradiation Voltage reference

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AI Technical Summary

Technical Problem

The existing laser irradiation devices are complex and time-consuming in the calibration process, making it difficult to effectively solve the optical power output changes caused by temperature changes in laser diode and photodiode packages.

Method used

By connecting a variable resistor with optional resistance value between the anode of the photodiode and the ground, the appropriate resistance value is selected to maintain the reference voltage on the anode of the photodiode, thereby reversely biasing the photodiode, simplifying the calibration process.

Benefits of technology

The linear response between the photodiode current and the laser diode optical power output is realized, simplifying the calibration process and improving calibration efficiency.

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Abstract

The invention relates to an apparatus and method for laser diode calibration. A laser irradiation apparatus is provided. For example, a laser irradiation apparatus includes: a laser diode having an anode and a cathode; a photodiode having an anode and a cathode connected to the cathode of the laser diode; a laser diode driver having a voltage output connected to the anode of the laser diode and a feedback input connected to the anode of the photodiode; and a variable resistor having a selectable resistance value connected between the anode of the photodiode and the ground. The selectable resistance value is selected to maintain a reference voltage on the anode of the photodiode to reverse bias the photodiode.

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