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Empty Glass Cells![]()
GC252 Two Fill Tubes, Ø25 mm Windows Application Idea The KF25C050 Ø1/2" compression fitting provides compatibility with KF25-flanged vacuum systems. GC501 One Fill Tube, GCV251 One Fill Tube with Borosilicate Cell KF25C050 KF25 Flange to Compression Fitting Adapter KF25WNC Wing Nut Clamp, KF25CR-F Centering O-Ring Inside Related Items ![]() Please Wait ![]() Click to Enlarge The GCV251 and GCV501 Empty Glass Cells feature a J. Young® Valve that can be closed to maintain a high-vacuum seal.
![]() Click to Enlarge Our Ø25 mm glass cells can be mounted in our GCH25-75 Heater using four ER4 cage rods. Features
These empty borosilicate glass cells can be filled with vapors of specific atomic elements or molecular compounds, each of which has a well-defined absorption spectrum. Cells are available with either one or two fill tubes. A single fill tube is useful when sealing a cell while two fill tubes can be used to maintain constant gas flow. We also offer empty cells with a single fill tube and a J. Young® Valve to seal the cell with a high-vacuum, greaseless stopcock (see the image to the right). Fill tubes with a 0.5" outer diameter are compatible with Ø1/2" compression fittings, as shown on the Vacuum Seal tab. Custom reference cells can be manufactured upon request, including different cell lengths, cell diameters, or fill tube configurations. Please contact Tech Support with inquiries. Each cell is made from borosilicate glass, a rugged material known to resist chipping and cracking, and has high transmission from 350 nm to 2200 nm. The ends of each cell include either Ø25 mm or Ø50 mm fused windows. We also offer glass cells with threaded ends for installing flat windows that can match your desired transmission properties. All glass cells on this page can hold a vacuum below 10-7 Torr and withstand pressures up to 5 psi. The post-production cleaning process for these cells consists of an ultrasonic cleaning followed by a methanol rinse. The cell is then connected to a vacuum system and leak tested. The cells are not vacuum sealed when shipped; before using the cell in a vacuum setup, we advise users to follow a similar cleaning process for each cell. These cells are commonly used in spectroscopic applications such as tunable diode laser calibration, stabilization of laser frequencies, and calibration of wavelength meters. Refer to the Application tab for a general overview of use with absorption spectroscopy. We also offer pre-assembled Herriott cells for gas absorption spectroscopy applications, as well as filled and sealed vapor reference cells. Mounting & Heating Options *J. Young® is a registered trademark of GPE Scientific. Viton® is a registered trademark of DuPont. Absorption SpectroscopyThe reference substance pumped into the glass cell is associated with a unique absorption spectrum that serves as its fingerprint. The contents of a reference cell can be determined via a linear absorption measurement (as depicted by the simplified schematic below). By scanning a tunable diode laser over a wavelength range and detecting light absorption with a photodetector, a series of peaks will be recorded, which is characteristic of the vapor inside the cell. Please note that we also offer pre-filled and sealed vapor reference cells with quartz or borosilicate substrates. ![]()
Animated Example of a Vacuum-Sealed System
Creating a Vacuum Seal with a KF FlangeThorlabs' empty borosilicate cells can be used with our KF-Flanged components and accessories in order to manage gas flow in and out of the cell. The glass cells are terminated with one or two Ø0.50" (Ø12.7 mm) fill tubes that can be inserted into the KF25C050 flange-to-compression-fitting adapter. To input the cell into a vacuum system:
For an animated representation of the above process, please see the video to the right.
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Glass cells with a single fill tube are useful when introducing a sample into the cell and sealing it off for measurements. A gas sample can be sealed off elsewhere in the system or by using a cell with a J. Young® Valve integrated into its fill tube. J. Young Valves incorporate a retractable, greaseless, PTFE stopcock for maintaining a high vacuum. The yellow knob can be tightened to create a seal before the T-junction fill tube or unscrewed completely for cleaning. We offer Ø25 mm glass cells with Ø21.0 mm clear apertures and Ø50 mm glass cells with Ø36.0 mm clear apertures. The Ø25 mm glass cells are compatible with our selection of heaters for Ø25 mm glass cells. All of our glass cells are made from borosilicate glass. ![]()
Glass cells with two fill tubes enable gas samples to flow through the cells while under analysis. These cells do not come with integrated valves and can only isolate a sample by adding valves at other points in the system. We offer Ø25 mm glass cells with Ø21.0 mm clear apertures and Ø50 mm glass cells with Ø36.0 mm clear apertures. The Ø25 mm glass cells are compatible with our selection of heaters for Ø25 mm glass cells. All of our glass cells are made from borosilicate glass. | |||||||||||||||||
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