7 Tesla Optical Cryostat
Quantum Design OptiCool®
The OptiCool by Quantum Design is a new optical cryostat using an innovative design that puts the sample volume in the heart of your optical environment. A custom 3.8 inch bore, split-coil, conical magnet offers fields perpendicular to the optical table up to ±7 tesla. The highly integrated design means, even with a magnet, your sample isn’t buried inside a large cryostat, far away from the optics. Seven side optical ports and one top optical port allow for optical access to your sample from a wide array of directions.
Possible applications for the OptiCool environment
- MOKE / CryoMOKE
- Raman / FTIR Spectroscopy
- UV / VIS Reflectivity & Absorption
- AFM / Microscopy
- NV / Color Defect / Vacancy Centers
- Time Resolved Magnetic Spectroscopy
- Quantum Optics
The OptiCool optical cryostat is a cryogen-free system with automated software to control temperature and magnetic field. At the push of a button you can change your sample temperature from 1.7 K to 350 K, with or without an applied magnetic field. A generous 89 mm diameter by 84 mm tall sample volume provides exciting possibilities in experiment design.
- 8 Optical Access Ports:
- 7 Side Ports (NA > 0.11)
- 1 Top Port (NA > 0.7)
- Temperature Range: 1.7 K to 350 K
- 7 T Split-Coil Conical Magnet
- Low Vibration: <10 nm peak-to-peak
- 89 mm x 84 mm Sample Volume
- Automated Temperature & Magnet Control
- Cryogen Free
"We were looking for a closed-cycle magneto-optical cryostat that is capable of performing atomic force microscopy (AFM) and scanning optical near-field microscopy (s-SNOM) in high magnetic field. OptiCool® proved to be the system with the best stability which provides sub-nm vibrations for cryogenic scanning probe measurements while still offering excessive access to external light. This brings us infinitely new possibilities for our research. Our lab now hosts two OptiCool systems (as of 2022) – one for infrared magneto-SNOM and one for terahertz magneto-SNOM."
– Mengkun Liu, Stony Brook University
Sample Pod with Bragg-LT Diamond Anvil Cell
Sample Pod with Four Nanopositioner Stacks
Nanopositioner on Standard Pod
Nanopositioner on Large Volume Pod
Nanopositioner with Thermal Link
The OptiCool's Sample Pod provides a place to build and customize your experiment on the bench. When you are ready to make a measurement, the Sample Pod easily plugs into the pre-wired temperature control column. Having multiple experiments arranged on multiple pods allows you to switch experimental hardware quickly. Sample Pods are available in both a standard configuration and a large-volume configuration depending on the experimental needs. Each type of pod can be further configured by changing the riser pieces (available in three lengths; included with the system) to adjust the height of the mounting plate.
- Standard Sample Pod – Allows for mounting plate positions at 56.4 mm, 32.8 mm and 12.4 mm below the magnet center.
- Large-Volume Sample Pod – Allows for mounting plate positions at 131.3 mm, 111.0 mm and 87.4 mm below the magnet center.
Wiring and Feedthroughs
Wiring and feedthrough options are available to get electrical and optical signals into and out of the OptiCool cryostat. Wiring options are permanently mounted in the cryostat, so are usually installed at the factory. The fiber feedthrough is easily installed or removed by the end user. Pick from the following options to meet your experimental needs:
- Standard Sample Wiring – Each sample wiring assembly contains eight twisted pairs for a total of 16 wires. Four 4-pin connectors are presented on the pod to make contact to your sample.
- 3-Axis Positioner Wiring – The positioner wiring assembly is designed to be compatible with attocube piezo positioner stacks. Each assembly has enough wires to run up to 3 different axes of motion with the RES position feedback. If position feedback is not required, the feedback wires can be repurposed to run an additional 3 axes of motion. Contact Quantum Design for more information.
- RF Coax Wiring – The RF coax wiring assembly contains four coaxial cables capable of carrying high frequency signals up to 20 GHz.
- Optical Fiber Feedthrough – Feed four or more optical fibers into the sample volume. Can also be used for other items such as gas tubes.
Many optical applications require precise positioning of the sample to the optical path for focusing or examination of an area of interest. The ability to scan the sample is also required for 2D imaging of sample properties. To meet these needs the OptiCool cryostat can be configured with a piezo-based nanopositioning stack to move your sample in situ. The nanopositioner option comes with all the adapters needed to mount the nanopositioners onto a pod, specialized cryostat wiring, cabling that can connect to the piezo controller, and a thermal link specifically designed for use in the OptiCool. The nanopositioner stack can be mounted on the standard pod or on the large-volume pod depending on experimental needs.
Windows and Objectives
Optical experiments can require a variety of windows and microscope objectives. To address these needs Quantum Design offers window and objective configuration options, including a low working-distance top window option, vacuum objective mounting hardware, and a bottom access window. The low working-distance top window reduces the minimum working distance from 15 mm to about 3 mm between the top of the outer window and the underside of the inner shield window. The hardware allows you to directly mount a wide variety of objectives at close spacing using the included window clamp and standard off-the-shelf adaptor rings. This means you can make adjustments or swap out objectives while the sample remains cold. Quantum Design also offers a Zeiss 100x LD EC Epiplan-Neofluar, infinity-corrected objective mounted inside the cryostat. This objective offers a 0.75 NA and a working distance of 4 mm. A kit is also available to mount your own objectives in vacuum if desired. A bottom access window is available for the cryostat, allowing transmission measurements along the magnet axis, perpendicular to the surface of the optical table.
OptiCool – Introduction
Swapping Out Sample Pods in OptiCool
Changing Windows in the OptiCool
Dynamics and Control in Quantum Materials
Probing Spin Dynamics in InSe with Time-Resolved Kerr Rotation