pioneers of precision

pioneers of precision

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Brochure version: 2015 - 02Cryo-Optical Table

Specifications

cryo-optical table (closed-cycle)

attoDRY800

Quantum optics experiments often require cryogenic temperatures incombination with optical access to the sample space. Most experimental
setups contain numerous optical elements that need to be preciselyarranged on an optical table to shape and prepare the incident light,
as well as to efficiently collect and convert the emitted light from thesample. The available space on the optical table in such cases is ofparamount importance to many complex setups.
The revolutionary concept and design of the attoDRY800 presents theperfect solution to satisfy these demanding requirements: it consistsof 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 ensuresa 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.

• Obstruction free work space• Optical table included (different sizes available)• 29 customer wires included, heat sunk @ 4 K• Touchscreen based control interface, no PC required

Being a closed-cycle cryostat, the attoDRY800 is the perfect
replacement for all helium flow cryostat setups, adding the hugeadvantage 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 longmeasurement 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 levelvia a patented vibration isolation technology smaller than 1 nm (RMS).
Hence, with the attoDRY800 even extremely sensitive measurements arepossible. Its cold breadboard sample space is designed to host several of
attocube’s patented nanopositioners, as well as complete microscopeor photonic probe station solutions.

4General Specifications

Application examples

PRODUCT KEY FEATURES• cold breadboard integrated into optical table• low vibrations < 10 nm peak-to-peak• fully automated variable temperature 3.8 .. 320 K• customizable vacuum shroud

BENEFITS• 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 withmulti-degrees of freedom

3APPLICATION EXAMPLES

2
101 optical table (included)
02 cryocooler
03 cold breadboard

04 customizable vacuum shroud
with 5 windows (1”)
05 touchscreen user interface
06 obstruction free work space

ultra-low vibration, closed-cycle cryostat intimately integrated
into optical table, optical table included(water or air-cooled compressor available)

sample environment

cryogenic vacuum, sample cooled via braids (ATC100)

sample space

75 mm (diameter)

sample exchangeeasy access via removal of vacuum shroud

vibration & acoustic noise damping systemproprietary low vibration designusabilityobstruction free work space, touchscreen based control
interface, no PC required, fully automated temperature control(vacuum, cooldown, T control, warmup)

Performance Data*• 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

temperature range

3.8 .. 320 Kcooldown time to 6 K (4 K)

approx. 3 h (4-5 h), depending on load

temperature stability

15 mK (peak-to-peak with damped sample mount)vibration level< 10 nm (peak-to-peak)cooling power at sample location

100 mW @ 4.2 K

Closed-cycle cooler

56technology

Quantum Dot
Spectroscopy

Photocurrent / Photoconductivity Measurements

power consumption

max. 3 kW

cooling of compressor

water cooling (default; requires local infrastructure)
air cooling (optional)

Dimensions
Optical table

standard size 900 mm x 1800 mm x 305 mm(leg height 597 mm); metric or imperial mounting threads(other table sizes available)

Options

Micro-Raman Imaging /Spectroscopy

Resonant
Fluorescence

Optically Detected Nuclear
Magnetic Resonance

Quantum Information
Processing

temperature controller

includedpumping kit

included

electrical access

29 customer wires included, heat sunk @ 4 K(additional wiring on request)

optical windows

4 side windows, 1 top window (1” diameter)
up to 9 windows possible (optional)

type of windows

BK7 (others on request)

UHV version

on request

larger sample spaceon request (200 mm)

vacuum shroud

customized height and diameter (on request)

feedthroughs

electrical (DC, HF), optical fibers, gas capillary (on request)

sample motion

Preimum Line positioners and scanners*Note: All product specifications are based on a standard system. Optional items or upgrades, other configurations or customization may
change one or several of the indicated values. Specifications and other information subject to change without notice.

attoCRYO
Research Cryostats

attoDRY800

attoDRY800

attoDRY800

attoDRY800

optional items for the cryo-optical table…don’t let the cryostat obstruct the access to your cold sample…

Decide on the table size

Add multiple degrees of freedom for sample motion

Customized Newport optical tables with metric M6 or imperial hole pattern
are available with the following dimensions:

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

1500 mm
1200 mm
900 mmDefault size: 900 mm x 1800 mm
Leg height: 597 mm, Table thickness: 305 mm

1800 mm2100 mm
2400 mm
2700 mm3000 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 thecustomer upon ordering. It can be placed as close as 200 mm to the longedge, as well as off-center with respect to the short edge on wider tables(depending on table size).
Contact attocube for more details.

Sample holder (ASH/LCCC)
For users that require a sample holder with electrical contacts, attocube offersa chip carrier socket for standard 20, 28 or 32 pin leadless ceramic chip carriers.
The replaceable PCB base features conveniently accessible contacts for thewiring. Good thermal contact is ensured via a Cu post which extends all theway through the assembly from the thermal link (ATC100) to the leadless ceramic
chip carrier. Precise temperature control is achieved via an additional calibrated
temperature sensor and heater integrated into the sample holder base.
ArticleASH/LCCC/20

No: 1010435

ASH/LCCC/28

No: 1010436

ASH/LCCC/32

No: 1010437

Ultra-low working distance – replace your flow cryostat!

Electrical and optical feedthrough options

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.

Additional optional wiring is either provided upon ordering directly through thecryostat, with convenient electrical access at pin connectors close to the sample
in vacuum for customer use, or 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.

Specifications
minimum working distance (without cold window) 1 mm

Articleminimum working distance (with cold window)

2 mmElectrical access in vacuum

window material

fused silica (others on request)

Pre-wired to cold plate

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

window thickness

0.5 mmCoaxial feedthroughs

2 or 4 SMA connectors

clear aperture outer window

10 mm

Fiber feedthroughs

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

10, 25 or 41 wires, terminated in vacuum

attoCRYO
Research Cryostats

attoDRY800

Reclaim your optical
table
rererattoDRY800 Options

attoCFM/800

integrated apochromatic low temperature optics for maximum collection efficiency

complete cryogenic confocal microscope
3vacuum shroud with 5 optical windows

When collecting small optical signals, e.g. from single photon emitters,
which constitute promising candidates for solidstate based qubits,
it is a crucial requirement to maximize the collection efficiency. Thisis best done with objectives that feature high numerical apertures,
which usually implies a low working distance. In this case getting theobjective 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 out­s ide of a cryostat often
results in large drifts, which are inacceptable for the long measurement
cycles required when focusing on a single quantum emitter.
The solution is provided by the attoDRY800 optical cryo-microscope:based on the unique low vibration design of the attoDRY800 cryo-opti­
cal 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. 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 ofemitters which stays within 75-100%.

low temperature compatible
apochromatic objective

Detection channel(e.g. Si detector forphotoluminescence/fluorescence, or agrating spectrometer)

1

2

4
3

3

Excitation channel

5
Optional: additional
excitation channel(e.g. for lithography)

Optical inspection unit

567

For many years, attocube has been pioneering cryogenic confocal
microscopy. With the introduction of the attoCFM series of confocal
microscopes almost a decade ago, the optical investigation of single
quantum devices on the sub-micron scale at low temperature suddenly
became available as a standard tool for scientists worldwide. Today,
the attoCFM/800 is once again redefining the state-of-the-art for low
temperature confocal microscopy.
It combines the revolutionary concept of the world’s first cryo-optical
table with integrated low temperature objectives and the external
optics head of the attoCFM I. The researcher is provided with a complete
cryogenic confocal microscope system which arrives in his laboratory
fully integrated and tested. Accompanied by an on-site installation andhands-on training by our experienced optics experts, this will jump start
your measurements, and enable useful research results in a minimum
amount of time. F8COMPONENTS
01 FC/APC Fiber port

902 Collimator
03 Mirror
04 Up to two filter mounts (optional)		

or rotatable polarizer (optional)

05 Dichroic beam splitter (exchangeable)radiation shield		with optional laser filter and detection filter

06 LED illumination (broadband)
07 CCD camera for inspection
08 Beamsplitter

10
12

11

09 Steering mirror for the combined beams
10 Low temperature compatible objective
11 Sample
12 XYZ coarse positioners + XY scanner

nanopositioner stack (x,y,z)with thermal flex linkcold plate

Cryogenic apochromatic objectives• negligible chromatic focal shift in working range• uniform spot size and intensity within apochromatic range

attoCRYO
Research Cryostats

attoDRY800

attoDRY800

attoDRY800 Optical Cryo-Microscope