Standard Operating Procedure
Synrad CO2 Laser


CO2 Laser


This Standard Operating procedure applies to the Synrad 48-1 arbon-dioxide laser housed in Niagara College's High Power Laser Lab (V12). This class-IV laser has an output in the infrared and is used for materials processing applications.


Manufacturer: Synrad, Inc.
Model Number: J48-1SW
Type: Carbon-Dioxide
Class: IV
Maximum Rated Power: 30 Watts
Wavelength Range: 10510nm to 10650nm
Cooling: Flowing Water, 0.5 gpm
Power Source: Single-Phase, 120V
Controller: Custom-Built microprocessor controlled

Operating Procedure

Revised 2004/02/12 by M. Csele

STARTING the laser

  1. Don safety glasses suitable for the infrared. These glasses must have an OD of at least 5 at 10.6um.
  2. Turn the power switch on the external power supply ON. The controller will initialize, display start-up messages, then display "LASER OFF".
  3. Turn the cooling water supply ON. The valve is located at the rear of the bench. Water flow will be verified by the disappearing warning message on the controller's display.
  4. Turn the START key on the laser control (see figure 1 below). Assuming all interlocks are closed the laser will begin the audible start delay (about 10 seconds).
  5. After the start delay the laser defaults to 100% power and IDLE mode. While the 'PWR' indicator on the laser will be lit at this time, no emission will occur.
  6. Adjust the output power using the UP and DN keys. Power may be adjusted in increments of 10% from 0% to 100%.
  7. Press the 'IDLE-RUN' button to begin. Output will begin from the laser. Press the 'IDLE-RUN' button again to pause the laser as this places it in 'simmer' mode where it is always ready.

Synrad Controller
Figure 1: Synrad Controller


  1. Turn the key to the OFF position.
  2. Turn the water supply valve OFF.


Should a fault have been detected or an interlock opened lasing will cease immediately and the source of the fault displayed on the LCD display. As per class-IV regulations the key must be turned OFF for a minimum of four seconds before it may be turned to the START position again to restart the laser (after which the normal start delay will occur). As well, the source of the fault must be cleared before you proceed.


The controller features integral connections for a water flow sensor (GEMS RFS=series) via the DB-9 connector which also supplies 24VDC for the sensor. External interlock input is provided on the DB-15 connector as per class-IV requirements and a 'dummy plug' must be installed if no interlock source is provided. The DB-15 connector also features an external IDLE input (TTL-compatible) allowing computer control of laser output. Finally, connection to an external 24V warning lamp is also provided from the same DB-15 connector.

Copyright (C) Niagara College, Canada, 2004
This page is part of the PHTN1430 Course Page