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Empty Glass Cells
Two Fill Tubes,
These empty glass cells can be
One Fill Tube,
One Fill Tube with
Click to Enlarge
ER4 cage rods.
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.
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 and either Ø25 mm or Ø50 mm windows. A single fill tube is useful when sealing a cell while a cell with two fill tubes can be used to maintain constant gas flow. We also offer an empty cell with a single fill tube and a J. Young valve to seal the cell with a high-vacuum, greaseless stopcock (see below for details). Each fill tube has a 1/2" outer diameter for compatibility with Ø1/2" compression fittings. 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 2.2 µm. The cell windows are fused, allowing the cell to hold a vacuum below 10-7 torr. It can also withstand pressures up to 5 psi. The post-production cleaning process for these cells consists of an ultrasonic cleaning step using water, followed by an acetone rinse. Then the cell is connected to a vacuum system and leak tested.
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 filled and sealed vapor reference cells.
The 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.
Our empty borosilicate glass cells are available in three varieties. The GC251 and GC252 cells incorporate one and two fill tubes, respectively. The GCV251 cell has one fill tube and features a J. Young valve at a 90° bend. The valve incorporates a retractable, greaseless, PTFE stopcock for maintaining a high vacuum. The yellow knob can be tightened to create a seal before the T-junction in the fill tube. It can also be unscrewed completely for cleaning.
Our empty borosilicate glass cells are available in three varieties. The GC501 and GC502 cells incorporate one and two fill tubes, respectively. The GCV501 cell has one fill tube and features a J. Young valve at a 90° bend. The valve incorporates a retractable, greaseless, PTFE stopcock for maintaining a high vacuum. The yellow knob can be tightened to create a seal before the T-junction in the fill tube. It can also be unscrewed completely for cleaning.
The GCH25-75 reference cell heater uses two built-in heating elements to raise the temperature of a vapor cell to as much as 50 °C (when room temperature is 25 °C; limited by the heater unit). The temperature is monitored using a Minco Thin Film Element sensor. Adapter rings for Ø9 mm and Ø19 mm cells are included. Without the use of adapters, the heater mounts Ø25 mm cells. This allows the heater to be used with our standard reference cells.
Thorlabs' TC200 Temperature Controller (sold separately) is the ideal controller to maintain the heater temperature. Each heater ships with two Hirose cables to directly connect to the main and auxiliary output of the temperature controller. The auxiliary output allows for full operation of the reference cell heater using only one controller.