ST-500 Microscopy Cryostat

The Janis ST-500 continuous flow cryostat has been specially designed for use in microscopy, imaging, and high spatial resolution photoluminescence. The combination of the low thermal-expansion support structure and internal vibration isolation results in nanometer-scale vibration and drift levels. The cryostat geometry offers a short working distance (for use with high magnification optics) and permits mounting on common microscope stages and translators.

Standard configuration

ST-500 sample mount area

The ST-500 system includes a flexible high-efficiency variable flow cryogen transfer line. This line delivers liquid helium or liquid nitrogen to a two-stage heat exchanger and sample mount. The ST-500 is portable, easily mounted in a variety of configurations, and can be used both in transmission and reflection geometries.

Other configurations include:

  • Ultra-compact
  • Options for micro-spectroscopy techniques
  • Nano-positioning stages from attocube
  • Sample extension for magnetic measurements
  • Breakout box accessory for electrical measurements
  • Ultra-high vacuum
  • Superconducting magnet for high-resolution microscopy
  • Micro-manipulated cryogenic and vacuum probe system for chips, wafers and device testing
ST-500 Microscopy Cryostat Mechanical Drawing

Options include:

  • A variety of window materials and sizes
  • Interchangeable sample mounts for different sample thicknesses
  • Magneto-optical system (including optional rare earth magnets)
  • Electrical and RF feedthroughs
  • A complete system solution including temperature controllers, pumping systems, and storage Dewars
  • Looking for a cryogen-free option for your existing ST-500? Optional recirculating gas cooler eliminates the use of liquid helium for "wet" systems.
Janis — a Lake Shore Company
ST-500 microscopy SuperTran cryostat

ST-500 Specifications

Temperature range3.5 to 475 K (standard)
Initial cooldown time10 K (LHe): 25 min
80 K (LN2): 30 min
Cryogen usage during cooldown to 4.2 K1 L LHe
0.3 L LN2
Temperature stability (with temperature controller)<50 mK
Weight (not including transfer line)7 lb (3.2 kg)
Nominal cryogen usageLHe at 5 K: ~1.1 L/h
LN2 at 80 K: ~0.1 L/h
Nominal vibration amplitude±15 nm
Positional drift±10 nm in 5 min
±60 nm in 30 min

NOTE: Specifications do not include optical or experimental heat loads and assume horizontal orientation. Specifications may change depending on the length of the transfer line flexible section.
Vibrational amplitude measured while on an isolated optical table. Results may vary depending on experimental conditions.
Data courtesy of B. B. Goldberg and M. S. Unlu, Departments of Physics, ECE and Photonics Center, Boston University.

Vibration measurements

ST-500 vibration data horizontal position P1

ST-500 vibration data horizontal position P2

ST-500 vibration data vertical position P1

ST-500 vibration data vertical position P2

Long-term drift data

ST-500 Long Term Drift Data

ST-500 long term drift data from University of Oxford, Janis Research, cryogenics

Data taken by K.H. Lee (University of Oxford)

The Taylor group at the University of Oxford has performed some characterization of the ST-500 cryostat drift. The characterization is based on the tracking of a single QD over time, and test results indicate a typical positional drift of about 2 nm/min.

Reference: K. H. Lee, et al, "Registration of single quantum dots using cryogenic laser photolithography" Appl. Phys. Lett., 88, 193106, 2006.

 

Other configurations

Compact and ultra-compact configurations

Compact and ultra-compact designs are also available if space restrictions do not allow the use of the ST-500. See details for the ST-300-MS SuperTran cryostat and the ST-500-UC ultra-compact cryostat. ST-500HT ST-500UC Microscopy Cryostats ST-500UC Ultra Compact Microscopy Cryostat

Options for micro-spectroscopy techniques

Special Diamond Anvil Cell (Diacell® CryoDAC-ST) configured for use with the ST-500 is available from easyLab Technologies Ltd. Special Diamond Anvil Cell configured for use with the ST-500 is available from D'Anvils. Easylab Diamond Anvil Cell DAnvil Diamond Anvil Cell

Nano-positioning stages from attocube

Nano-positioning stages can be installed on the ST-500 microscope cryostats for a number of short working distance applications. Because this design uses a standard ST-500 cryostat as a base, existing cryostats may be upgraded to the special attocube configuration. These photos show an ST-500-attocube with a special flange-mounted on the bottom that will interface with an optical table. From the outside, this special ST-500-attocube looks identical to the model ST-500-LGV microscopy cryostat, which has a 2.5 in cold plate and 7 in outer diameter vacuum chamber.ST-500 attocube ST-500 nanopositioning stage ST-500 attocube Special Flange

Special ST-500-LGV with 11 in diameter vacuum shroud

The customer-designed sample holder was very large so a large 11 in diameter vacuum shroud was used. Special ST-500-LGV with 11 inch Diameter Vacuum Shroud

Sample extension for magnetic measurements

Using the same proven cryostat design as the regular ST-500 cryostat, the ST-500 for magnetic measurements features an extended sample mount for use inside the bore of a magnet. This extended sample mount may be purchased separately or with a set of permanent magnets for measurements in fields of up to 0.5 T.

These photos show the ST-500 with an extended sample mount and permanent magnet. The length of the extension may be specified at the time of order, and the position of the magnet relative to the sample is fixed using a Teflon spacer. The magnetic field direction is perpendicular to the plane of the sample.

The flexible ST-500 design means that the cryostat may be ordered with an extended sample holder and vacuum shroud for magnetic measurements, and a standard sample holder and vacuum shroud for other measurements. Switching between the two holders is as simple as changing samples.

A set consists of up to five interchangeable magnets: the full set allows measurements in discrete steps of 0.1 T. Existing ST-500 cryostats may be upgraded by simply ordering the special sample holder, vacuum shroud top plate and radiation shield cover. ST-500 with permanent magnet ST-500 with permanent magnet close-up ST-500 microscopy layout

Breakout box accessory for electrical measurements

For customers requiring multiple feedthroughs for electrical measurements, Janis can build a breakout box. The photo illustrates a special ST-500 with o-ring sealed top and bottom windows and breakout box. ST-500 Breakout Box Accessory for Electrical Measurements

Sample extension and breakout box accessory

ST-500 snout Breakout Box

O-ring sealed top and bottom windows

For customers who require soft windows that cannot be epoxy sealed, we offer the option of using an o-ring seal to install the windows. The lower window is recessed so that it is flush with the bottom surface of the cryostat. The photo shows a cryostat with an o-ring sealed top and bottom windows. This cryostat also featured a breakout box. ST-500 With O-Ring Sealed Top And Bottom Windows-bottom ST-500 With O-Ring Sealed Top And Bottom Windows-top

ST-500 with special NW-50 top flange

The photo shows a model ST-500 with a special NW-50 top flange that will mate with a flexible bellows in the customer's existing equipment ST-500 with Special NW-50 Top Flange

ST-500 with two special sample holders and black anodized aluminum baseplate

The ST-500 shown has two special sample holders (DIP socket and special customer-design) and a black anodized aluminum baseplate. The baseplate was designed to customer specifications so they can mount the ST-500 in their own setup. The ST-500 will be operated vertically. This baseplate design requires an adaptor flange. When the baseplate has clearance holes, instead of tapped holes, the customer can mount their ST-500 directly to the optical bench without providing any special hardware on their own. ST-500 with Two Special Sample Holders and Black Anodized Aluminum Baseplate

Mounting flange for optical table

This ST-500 includes a mounting flange to allow it to be bolted to an optical table. ST-500 Mounting Flange for Optical Table

Spare top plate

The photo shows a spare top plate available as an accessory or upgrade for the ST-500 microscopy cryostat.ST-500 Spare Top Plate

Special XY manipulator stage for use with the ST-500

XY manipulator Stage For ST-500 XY manipulator Stage With ST-500

Ultra-high vacuum configurations

ST-500-UHV cryostat for microscopy with a UHV sample environment. This cryostat combines the already proven ultra-low vibration and thermal drift of the standard ST-500 microscope cryostat with UHV-compatible design features. This continuous flow cryostat includes the same heat exchanger design as the standard ST-500 resulting in a low thermal drift of ~2 nm/minute. It also has the same low base temperature (3.8 K) and helium consumption (~1.1 L/h) as the standard ST-500.

Fully bakeable to 175 °C (~450 K), this cryostat is true-UHV and is equipped with a viewport configured for short working distance measurements. Different window materials are available to suit the required transmission range. Depending on the window thickness, the working distance can be as short as 1 mm. Like the standard ST-500, this versatile design can be modified to accept internal nano-positioning stages for x-y-z motion. Systems incorporating nanopositioning stages utilize flexible UHV copper thermal braids for sample cooling. The cryostat can also be configured for reflection or transmission measurements and includes electrical feedthroughs allowing a range of electrical measurements to be performed. The ST-500-UHV can be used with liquid helium or liquid nitrogen and will operate in any orientation. Janis can supply a complete turn-key package, including a temperature controller and pumping station. Contact Janis today to see how the ST-500-UHV can be tailored to meet your specific experimental needs. ST-500-UHV Ultra High Vacuum microscopy cryostat

Superconducting magnet for high-resolution microscopy

Designed to operate with a Janis high stability microscopy cryostat, this system allows microscopy measurements to be performed in fields of up to 6 T. The system comes with x-y-z translation stages for sample scanning and focusing, and is designed for magneto-optical imaging at helium temperatures. ST-500 microscopy superconducting magnet system

Micromanipulated cryogenic and vacuum probe systems for chips, wafers, and device testing

The Janis ST-500 series probe stations are high-performance research instruments designed to provide affordable vacuum and cryogenic probing of wafers and devices. The proven ST-500 cryostat is the platform for these probe stations and includes low vibration technology (originally designed for high spatial resolution optical microscopy) to provide outstanding sample positional stability. Researchers around the world are using these systems to conduct research in a wide variety of fields, including MEMS, nanoscale electronics, superconductivity, ferroelectrics, material sciences, and optics.ST-500 probe system