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attoDRY 800

attocube

attoDRY 800 Cryo-optical table (closed-cycle)

Quantum optics experiments often require cryogenic temperatures in combination with optical access to the sample space. Most experimental setups contain numerous optical elements that need to be precisely arranged on an optical table to shape and prepare the incident light, as well as to efficiently collect and convert the emitted light from the sample. The available space on the optical table in such cases is of paramount importance to many complex setups.

The revolutionary concept and design of the attoDRY800 presents the perfect solution to satisfy these demanding requirements: it consists of an ultra-low vibration cold breadboard platform which is fully integrated into an optical table. The cryocooler assembly is located in the otherwise unused space underneath. This unique design ensures a free workspace and unobstructed optical access to the cold sample from all directions on the optical table via 4 side and 1 top window. Apochromatic objectives with high numerical aperture (NA=0.81-0.95) can either be integrated into the cryostat, into the vacuum shield, or put in close working distance next to the optical windows from the outside. This ensures extremely low drifts and optimal collection efficiency.
Being a closed-cycle cryostat, the attoDRY800 is the perfect replacement for all helium flow cryostat setups, adding the huge advantage that it requires no liquid cryogens and thus minimizing running costs. In addition, a fully automated temperature control between 3.8 and 320 K conveniently enables unattended long measurement cycles.

While most other off-the-shelf closed-cycle cryostats suffer from severe vibrations at the sample location, during the development process of the attoDRY800 special attention was given to keep the vibration level via a patented vibration isolation technology smaller than 5 nm (peak-to-peak). Hence, with the attoDRY800 even extremely sensitive measurements are possible. Its cold breadboard sample space is designed to host several of attocube’s patented nanopositioners, as well as complete microscope or photonic probe station solutions.
  • Closed-cycle Cryostats
  • Specifications
  • Applications
  • Features
  • Benefits
  • Options
  • Objective Options
  • PFDs
  • Videos
 Closed-cycle Cryostats

The dependance on liquid helium continues to involve heavy logistics, high prices and insecure supplies. Consequently, closed-cycle cryostats are becoming more and more popular in all areas involving measurements at variable or low temperatures. With the attoDRY series, attocube provides unique instruments with unmatched and proven low mechanical vibrations, unprecedented low acoustic noise levels, and exceptional temperature stability.
Besides, our systems have been optimized for fast turnaround times and hence enable a maximum number of measurement cycles in a minimum amount of time. Superconducting magnets in the form of single solenoids or vector magnets are available for measurements in high magnetic fields. Last but not least, special emphasis has been put into the ease of use through automation of routine procedures, also contributing to a highly professional user experience.

attoDRY LAB:  Fully automated, cryogen-free nanocharacterization platform with a variety of different measurement options.
attoCRYO:  Dry & liquid cryostats, optimized for the most sensitive measurement techniques at variable temperature & high magnetic field.
attoMOTION:  Piezo-based nanopositioners for research & industry applications. Suitable for ambient to extreme environments.
attoSENSORICS:  Ultra precise optical sensors for real-time displacement and vibration measurement with picometer resolution.
attoCONTROL:  Advanced control electronics and software control modules for attocube´s nanopositioners and microscopes.
attoMICROSCOPY:  Measurement inserts for nano-characterization of surfaces and bulk materials at low temperatures & high magnetic fields.



• quantum dot spectroscopy
• photocurrent / photoconductivity
• time-resolved spectroscopy
• reflectance / transmittance measurements
• micro-Raman imaging & spectroscopy
• optical resonators coupled to waveguides
• plasmonics on 2D materials
• resonant fluorescence
• optically detected nuclear magnetic resonance
• quantum information processing
• scanning probe microscopy


• cold breadboard integrated into optical table
• low vibrations < 5 nm peak-to-peak
• fully automated variable temperature 3.8 .. 320 K
• customizable vacuum shroud
• free workspace & obstruction-free optical access
• high sample throughput due to fast cooldown
• low running costs (no liquid cryogens)
• flexible combination with attocube equipment: patented cryogenic positioning solutions with multi-degrees of freedom

Decide on the table size

Customized Newport optical tables with metric M6 or imperial hole pattern are available with the following dimensions (other table sizes and solutions for integration with existing optical tables available on request):

Default size: 900 mm x 1800 mm
Leg height: 597 mm, Table thickness: 305 mm

1200 mm x 1800 mm

1500 x 1800 mm

1200 mm x 2100 mm

1500 x 2100 mm

1200 mm x 2400 mm

1500 x 2400 mm

1200 mm x 2700 mm

1500 x 2700 mm

1200 mm x 3000 mm

1500 x 3000 mm





Choose location of cold breadboard

In order to optimally adapt the system to specific experimental needs, the location of the cold plate of the cryostat can be specified by the customer upon ordering. It can be placed as close as 200 mm to the long edge, as well as off-center with respect to the short edge on wider tables (depending on table size).



Ultra low working distance  - Replace your flow cryostat!

A popular option for flow cryostats is to bring the cold sample as close as possible to an ultra low working distance window. This allows to flexibly use external optics with a very high angle of admittance, maximizing the collection efficiency via high numerical aperture objectives. The ultra low working distance option (ULWD) is available with a fixed sample holder, or ready to host either XY or XYZ positioners respectively.

Article

Art. No.

ULWD

1010432

ULWD-XY

1010433

ULWD-XYZ

1010434





Add multiple degrees of freedom for sample motion

The attoDRY800 is predestined to host your choice of nanopositioners, be it linear, rotary, tilting or scanning stages. Combine many degrees of freedom, or more than one stack of positioners to fulfill all requirements of your application! With our dedicated ATC100 thermal link, we ensure a perfect thermalization of your sample that is straightforward to mount and easy to use.



Sample holder (ASH/PCB/12)

For users that require a sample holder with electrical contacts, attocube offers a PCB based sample holder with 12 contacts. The sample itself sits on a Cu post providing good thermal contact to the ATC thermal link that in return connects to the cold plate. The user can establish contacts between PCB and sample by a bonder or by silver paint on short wires.

Article

Art. No.

ASH/PCB/12 base plate

1005710

ASH/PCB/12 PCB with 12 contacts

1005708





Electrical and optical feedthrough options

Additional wiring can be provided upon ordering directly through the cryostat, with convenient electrical access at pin connectors close to the sample in vacuum for customer use. Additional wiring can be also provided upon pre-wired and interfaced directly to the cold plate.
Retrofit extra wiring or optical feedthroughs are possible via electrical feedthroughs in an adapter ring at the bottom of the sample chamber.

Electrical & optical feedthrough options

Electrical access in vacuum

10, 25 or 41 wires, terminated in vacuum

Pre-wired to cold plate

10, 25 or 41 wires, low resistance,
compatible with nanopositioners

Coaxial feedthroughs

2 or 4 SMA connectors

Fiber feedthroughs

1, 2 or 4 FC/APC or FC/PC connectors



attoDRY800: standard configurations



Integrated Apochromatic & Cryogenic Objective

When collecting small optical signals, e.g. from single photon emitters, which constitute promising candidates for solid-state based qubits, it is a crucial requirement to maximize the collection efficiency. This is best done with objectives that feature high numerical apertures, which usually implies a low working distance. In this case getting the objective close to the specimen is necessary. Most high quality optics are designed for room temperature use, which would not survive periodic thermal cycling. Putting an objective out­side of a cryostat often results in large drifts. These drifts are inacceptable for the long measurement cycles required when focusing on a single quantum emitter. 

The solution is provided by our integrated apochromatic & cryogenic objectives: based on the unique low vibration design of the attoDRY800 cryo-opti­cal table, it features a fully integrated cold objective, hence minimizing drift while maximizing the collection efficiency. The apochromatic objective is located in cryogenic vacuum in close proximity to the sample, and is kept at the same cryogenic temperature as the sample via a thermal link to the cold plate. Aside from the high numerical apertures ranging from 0.81-0.82 of the objective, their biggest advantage is their small chromatic shift.

Optimized for working ranges of 465-600 nm, 565-770 nm and 700-985 nm respectively, the LT-APO objectives keep the focal plane within one depth of focus (~ 1 μm), ensure a uniform spot size, and an intensity of emitters which stays within 75-100% in their respective working ranges.

Maximum stability is also ensured by using our crossed-roller bearing based ANPx311 positioners both for xy motion of the sample, as well as for z focus of the objective. An optional scanner provides a cryogenic scan range of 30 µm x 30 µm. The sample holder ASH/PCB/12 features 12 electrical contacts by default (others on request). The sample is well thermalized via a flexible ATC100 thermal link to the cold plate as well. All wires are thermalized at 4 K, and perfectly integrated into the cryostat chamber.

Optical access is provided via the top window towards the LT-APO objective (clear aperture 4.7 mm), as well as through 4 side windows centered at the sample location. The window material is BK7 by default, but can be customized to almost any available other window material.

Integrated Ultra-High NA Vacuum Objective  

Collection efficiency is always important and in return the time periods over which signals need to be collected can be very long. Hence, the stability against long-term drift is a key aspect for many optics experiments as desribed on the previous page. Our cryogenic objectives constitute the ideal solution in terms of balance between the delicacy of having high quality and reliable optical elements at cold temperatures to minimize the drift and maximing the numerical aperture.

In some cases, however, photon counts may be so low that even over finite periods of signal collection, the numerical aperture of the objective used is the only thing that counts. For such applications, we can also integrate vacuum compatible objectives with NA=0.9 or even 0.95, further enhancing the short- and midterm collection efficiency.

Besides, this design also conveniently allows for the integration of reflective objectives, potentially covering the complete range from THz over far-infrared to infrared even down to UV. Hence, the cryostat can be utilized with light sources of any kind, in particular also at synchrotrons.     

Drift minimization can either be achieved passively by design and the use of appropriate materials or by active temperature control. 

Such designs have already been successfully implemented with the attoDRY700 and attoDRY500, our predecessor cryostat models of the attoDRY800, and can be adopted to the attoDRY800 on request.

Integrated Positioners & External Objective  

For decades, a large number of optics laboratories around the world has been using flow cryostats to cool their samples. In most cases, all the optics have been placed at room temperature, and sometimes even the whole cryostat has been translated in the horizontal plane for microscopy.

For any application, where the user wants to maintain that kind of simplicity, with all components living at room temperature, but the sample required to stay cold, the attoDRY800 can also be equipped with a vacuum shroud that is kept at a minimal size (reducing the heat load onto the cold plate). Typically, the sample is sitting on a stack of xyz positioners with optional scanner for translation, and a room temperature objective of your choice is placed right above the top window for microscopy or spectroscopy.

The working distance can be as low as 2 mm (1 mm) with (without) cold window installed; this however also depends on the desired wavelength range and hence window material & thickness. For the lowest working distances, sometimes a compromise between base temperature, sample size and xy translation range has also to be made. This configuration provides the user with the maximum flexibility in terms of optics that he can use to observe his sample, since almost any arbitrary objective can be used. In return, the amount of drift between sample and objective will almost be completely governed by room temperature fluctuations, and are hence in the hands of the user.