A low-cost and reliable laser shutter interlock using a software-command interface

TL;DR

This paper introduces a cost-effective, reliable laser interlock system using an ESP32 microcontroller that ensures safety by shutting off laser output during faults or unauthorized access, adaptable to various instruments.

Contribution

The paper presents a novel low-cost laser interlock device controlled via software commands, enhancing safety and versatility for laser systems.

Findings

Ensures laser shutdown during open circuit or power loss.

Prevents unintentional laser exposure by overriding local controls.

Compatible with any instrument using serial command interfaces.

Abstract

A simple and low-cost laser interlock is presented that operates via software commands issued by an ESP32 microcontroller. The architecture of the device is constructed to ensure the laser output is shut off in the event of either an open circuit on the interlock signal line from the laser enclosure or loss of power to the device. Unintentional exposure to the laser beam is prevented by overruling local controls (such as a keypad), until both the enclosure is re-interlocked and the user actively intervenes. The device presented is designed to close the mechanical shutter of a Spectra-Physics Millennia Pro pump laser while it continues to operate internally. The hardware and coding are versatile enough to be deployed on any instrument that receives software commands via a serial interface.