Probe Description

Bridge12 XLP(O) Probe Description


The Bridge12 XLP(O) probe is an EPR probe designed for pulsed X-Band (~ 9.5 GHz) EPR spectroscopy based on a loop gap resonator. The probe is optimized for pulsed EPR experiments, which require a large resonator bandwidth and high microwave conversion factors.

This X-Band probe is available in two different configurations:

  1. Pulsed EPR Spectroscopy: Resonator model: Bridge12 XLP-3.0
  2. (Pulsed) ODNP Spectroscopy: Resonator model: Bridge12 XLO

Both configurations are based on a Loop-Gap Resonator (LGR). When completely overcoupled, the resonator has a large bandwidth, and the high microwave conversion factor guaranties large B1e fields. This makes the XLP resonator the ideal choice for pulsed EPR experiments that require a large excitation bandwidths.

Bridge12 XLP Overview

Bridge12 XLP Overview

An overview of the Bridge12 XLP probe is shown in the figure shown above. For low-temperature measurements, the probe can be operated inside a cryostat. The Bridge12 XLP is compatible with commonly used cyrostats, such as the Oxford Instruments cryostat model CF935.

The main features of the probe are:

  • The resonator
  • Integrated temperature sensor
  • Baffles along the length of the probe
  • Electrical connector to connect the temperature sensor to a controller
  • SMA connector
  • Sample turret with sample stick
  • Iris adjustment

Optical Access

Optical access to the sample location for e.g. light/laser irradiation is possible in several different ways:

  1. Through the sample holder/stick (for fiber access only).
  2. Free-space access perpendicular to the sample axis (please inquire with Bridge12 about this option).

If you like to use an optical fiber to irradiate the sample using the sample holder/stick (option 1), please contact Bridge12 at for further information.

Temperature Sensor

The Bridge12 XLP probe has a built-in, calibrated Cernox temperature sensor. The connector is located at the back of the probe. Please use the cable that came with the probe to connect the probe to the temperature controller.

More information about the pin-out can be found in the section Temperature Sensor.

What’s next?

Last modified March 28, 2023: Updated QLP and XLP (21b7cb6)