30 mm Cage System Beam Traps

Beam Traps for CW or Pulsed Lasers
Solutions for up to 80 W
Essential Component for Laser Lab Safety

BTC30

BT600

BTC30

in 30 mm
Cage System

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Item #	Laser Input	Wavelength Range	Max Average Power
BTC30	CW	200 nm - 3 µm	5 W
BT600(/M)	CW	200 nm - 3 µm	80 W
BT610(/M)	CW & Pulsed	400 nm - 2.5 µm	30 W
BT620(/M)	CW & Pulsed	1 - 12 µm	50 W

Features

Laser Safety Devices Reduce Risk of Laser Damage
Solutions for up to 80 W or 40 J/cm² (10 Hz) Beams
30 mm Cage Compatible
Post-Mountable or Quick-Release-Cage-Mount Options Available

Thorlabs' selection of 30 mm cage-compatible beam traps 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.

We also offer a post-mounted beam block with a large absorption target area.

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Quick-Release Beam Trap for 30 mm Cage System

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A BTC30 Beam Trap mounted onto a
30 mm Cage system.

Scatters and Absorbs Laser Beam Energy
30 mm Cage System Compatible
Quick-Release Flexure Clamping Mechanism for Secure Cage Mounting without Disassembly
Ø8 mm Clear Aperture

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 below, 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.

Item #	Wavelength Range	Absorptive Material	Laser Type	Max Average Power	Max Average Power Density	Max Energy Density	Backscatter^a	Entrance Aperture
BTC30	200 nm - 3 µm	Anodized Aluminum	CW	5 W^b	150 W/cm² ^c	30 mJ/cm^{2 b}	5 x 10^-3 @633 nm	Ø0.315" (Ø8 mm)

Total integrated backscatter as a fraction of entrance beam power.
Housing temperature will exceed 40 °C above 2 W input power.
Performance of individual units may differ due to material variability.

Beam Traps for 30 mm Cage System

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Beam Trap Mounted on a Ø1/2" Post with a Ø1/2" Lens Tube Connected to the Input

Scatters and Absorbs Laser Beam Energy
30 mm Cage System and Ø1/2" Lens Tube Compatible
8-32 (M4)-Tapped Hole for Post Mounting

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.

Item #	Wavelength Range	Absorptive Material	Laser Type	Max Average Power	Max Average Power Density^a	Max Energy Density	Backscatter^b	Entrance Aperture	Max Acceptance Angle^c
BT600(/M)	200 nm - 3 µm	Anodized Aluminum	CW	80 W^d	150 W/cm²	30 mJ/cm²	2 x 10^-4 @ 633 nm	Ø0.43" (Ø11 mm)	±5°
BT610(/M)	400 nm - 2.5 µm	Absorptive Neutral Density Glass	CW and Pulsed	30 W	15 W/cm²	40 J/cm² ^f	9 x 10^-5 @ 633 nm
BT620(/M)	1 - 12 µm	Graphite	CW and Pulsed	50 W^e	25 kW/cm²	25 J/cm² ^f	1 x 10^-4 @ 633 nm 1 x 10^-4 @ 3.39 µm

Performance of individual units may differ due to material variability.
Total integrated backscatter as a fraction of entrance beam power.
In order to ensure optimum performance, measured from the optical axis in any direction.
Housing temperature will exceed 100 °C above 40 W input power.
Housing temperature will exceed 100 °C above 35 W input power.
At 1064 nm, 10 ns, 10 Hz. Performance of individual units may differ due to material variability.