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Temperature-Controlled and Heat-Sink Lens Tubes

  • Temperature-Controlled Lens Tube for Temperature-Sensitive Optical Components
  • Passive-Heat-Sink Lens Tubes with 0.25 °C/W Thermal Resistance
  • Compatible with Our SM1 Lens Tubes


Lens Tube


Lens Tube

Application Idea


Lens Tube Connected to a 
TC200 Temperature Controller

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Temperature-Controlled Lens Tube
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SM1L10H Mounted to a Ø1/2" Post via an SMR1 Fixed Mount


  • Temperature-Controlled Lens Tube for Heating Ø1" Optical Components
  • Lens Tubes with Passive Heat Sink for Cooling Ø1" Optics
  • Directly Compatible with SM1-Threaded (1.035"-40) Lens Tubes

Thorlabs offers lens tubes featuring controlled heating and passive cooling. The Temperature-Controlled Lens Tube can heat Ø1" optics up to 75 °C, which is ideal for tuning the performance of temperature-sensitive components and preventing condensation from forming on a lens surface. This lens tube is also equipped with an embedded NTC 10 kΩ thermistor that provides temperature feedback and automatic temperature control with the compatible TC200 Temperature Controller (sold separately).

For cooling Ø1" optical components exposed to large amounts of heat, our Passive-Heat-Sink Lens Tube features a low 0.25 °C/W thermal resistance with an exposed surface area of 79 square inches (510 square cm) and is directly compatible with SM1 or SM2 Lens Tubes.

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Temperature-Controlled Lens Tube

Temperature Range Room Ambient to 75 °C Max
External Dimensions Ø1.85" x 1.43" Long
(Ø47 mm x 36 mm Long)
Clear Aperture Ø0.90" (Ø22 mm)
Temperature Sensor NTC 10 kΩ Thermistor
(BETA = 3750)
Heater Resistance 19.7 Ω ± 10%
Maximum Heating Capacity 30 Watts
Maximum Heater Current 700 mA (@ 10 W)
Compatible Lens Tube SM1 (1.035"-40)
Recommended Heater Controller TC200
  • SM1 Lens Tube Featuring Controlled Heating for Ø1" Optics
  • Embedded NTC 10 kΩ Thermistor Provides Temperature Feedback
  • Directly Compatible with Our SM1-Threaded (1.035"-40) Lens Tubes

The SM1L10H Temperature-Controlled Lens Tube is a small heating device that is compatible with our Ø1" Lens Tubes. It is an ideal choice for applying heat to mounted optics in order to control their performance as a function of temperature. It can also be used to prevent condensation from forming on optics.

Optics can be secured inside the heating chamber with the included SM1RR retaining ring. The SM1L10H contains an embedded NTC 10 kΩ thermistor that provides temperature feedback and allows automated control of the internal heating element. It is directly compatible with our TC200 Temperature Controller.

The temperature-controlled lens tube can be post mounted using an SMR1 Fixed Lens Mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1L10H Support Documentation
SM1L10HTemperature-Controlled SM1 Lens Tube, One SM1RR Retaining Ring Included

Passive-Heat-Sink Lens Tubes

Transmission of Uncoated N-BK7
Click to Enlarge
HSLT2 Heat-Sink Lens Tube Secured to a QTH10 Tungsten-Halogen Lamp
  • Lens Tubes Equipped with Heat Sink for Passive Cooling
  • Offers 0.25 °C/W Thermal Resistance Over 2.10" (53.3 mm) Length
  • Internal SM1 (1.035"-40) Threading Directly Compatible with Our Ø1" Lens Tubes
  • External SM2 (2.035"-40) Threading for Compatibility with Our Ø2" Lens Tubes

This Passive-Heat-Sink Lens Tube provide the ability to cool down a lens tube setup that may be subject to an unusual amount of heat. By providing a total surface area of 79 square inches (510 square cm), it provides a thermal resistance of 0.25 °C/W. Ø1" optical components can be mounted into the HSLT2 using two SM1RR retaining rings (included). This lens tube is directly compatible with our SM1 Lens Tubes and can be mounted to SM05, SM2, or SM3 setups using our Lens Tube Adapters. The HSLT2 also features external SM2 (2.035"-40) threading on one end, making it directly compatible with our SM2 Lens Tubes.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
HSLT2 Support Documentation
HSLT2Passive-Heat-Sink SM1 Lens Tube with External SM2 Threads
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