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Beam Blocks and Traps
Thorlabs' selection of Beam Traps and Beam Blocks are common laser lab safety devices. They are designed to be the terminal piece of an optical system and absorb the incident laser beam. The beam traps that feature both 4-40 taps for integration into a 30 mm cage system and an 8-32 (M4) tap for post mounting are suitable for CW (BT600) or CW and pulsed (BT610 & BT620) beams up to 80 W. The BTC30 quick-release trap is suitable for 5 W CW lasers and can be easily inserted into and removed from existing 30 mm cage systems without disassembly. The LB1 visible beam block provides a large absorptive target area for CW beams up to 10 W. The LB2 IR beam block aborbs CW beams up to 80 W and pulsed beams up to 25 J/cm2, and is also compatible with our 60 mm cage systems.
Laser Safety and Classification
Safe practices and proper usage of safety equipment should be taken into consideration when operating lasers. The eye is susceptible to injury, even from very low levels of laser light. Thorlabs offers a range of laser safety accessories that can be used to reduce the risk of accidents or injuries. Laser emission in the visible and near infrared spectral ranges has the greatest potential for retinal injury, as the cornea and lens are transparent to those wavelengths, and the lens can focus the laser energy onto the retina.
Safe Practices and Light Safety Accessories
Lasers are categorized into different classes according to their ability to cause eye and other damage. The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic, and related technologies. The IEC document 60825-1 outlines the safety of laser products. A description of each class of laser is given below:
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Beam Trap Mounted on a Ø1/2" Post with a Ø1/2" Lens Tube Connected to the Input
Beam traps are common laser lab safety devices that are designed to absorb a laser beam's energy. Versions are offered here that can be used with either CW or pulsed laser beams. Simply align so the beam is directed into the entrance aperture.
These beam traps have internally SM05-threaded input apertures and are 30 mm cage system compatible. A Ø1/2" Lens Tube can be attached directly to the input aperture to shield the laser beam path (see photo to the right). An 8-32 (M4)-tapped hole on the bottom of the beam traps enables post mounting.
Please note that the BT620(/M) contains graphite and may not be suitable for all lab environments. All beam traps will become hot to the touch with beam powers above 10 W.
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A BTC30 Beam Trap mounted onto a
30 mm Cage system.
Beam traps are common laser lab safety devices designed to absorb laser beam energy. The Quick-Release Beam Trap offered here is optimized to accept CW laser beams of up to 5 W. It is equipped with a flexure-style clamp that snaps onto any two adjacent cage rods of a preassembled 30 mm cage system. To snap the beam trap onto the rods, ensure that the two 4-40 setscrews (0.050" hex) located on the sides of the trap are loose enough to allow the flexure mechanism to snap over the cage rods. Once positioned, these same two setscrews can be tightened to lock the beam trap's position along the rods. For small positional adjustments, slightly loosen the locking screws and slide the device along the cage rods.
Unlike the beam traps sold above, this beam trap is not equipped with a tap for direct post mounting. Caution should be taken when using this beam trap with laser beams above 2 W, as it will become hot to the touch.
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LB2 Beam Block Mounted on a
Ø1/2" Post with a 60 mm Cage System
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LB2 Beam Block with
The LB1(/M) Visible Beam Block absorbs CW visible laser beams. It is recommended for a maximum power of 10 W and is shipped pre-mounted on a 3" (75 mm) long, Ø1/2" post. The post is easily interchangeable with other Ø1/2" posts or Ø1" posts with 8-32 (M4) taps.
The LB2(/M) IR Beam Block absorbs CW and pulsed laser beams over the 1 - 12 µm wavelength range. It is recommended for a maximum average power of 80 W (CW) or a maximum energy density of 25 J/cm2 (pulsed). It features a large 1.97" x 1.97" (50.0 mm x 50.0 mm) entrance aperture which can be widened to 2.72" x 1.97" (69.0 mm x 50.0 mm) by removing the front faceplate using a 1.5 mm hex key. When installed, the faceplate serves to protect the graphite pad. The LB2(/M) features 4-40 taps for integration into our 60 mm cage system and also offers three 8-32 (M4) taps on one side for mounting to Ø1/2" posts or Ø1" posts.
Please note that the LB2(/M) contains graphite and may not be suitable for all lab environments. All beam traps will become hot to the touch with beam powers above 10 W.