OptiDry 250

Low-vibration 3 K optical cryostat platform for demanding experiments

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OptiDry 250 cryostat, Industrial metal machine with a rectangular compartment, control knobs, pipes, and a large cylindrical chamber
About
OptiDry 250 is our flagship and best-selling closed-cycle cryostat, combining low vibration with variable-temperature operation from 3 K to 300 K.

A Ø250 mm gold-plated copper breadboard, five optical access ports and configurable interfaces provide flexibility for optical, transport and metrology experiments.

Robust and versatile, it is continuously refined in close collaboration with researchers.
OptiDry 250 cryostat, scientific machine with cylindrical and rectangular sections connected, featuring multiple knobs, valves, and control panels.
Side View
Close-up of an OptiDry 250 cryogenic cooling machine with a visible cold head unit and metal components in an industrial setting.
Front View
Close-up of an OptiDry 250 cryostat
Pulse Tube
Close-up of Close-up of an OptiDry 250 cryostat, cylindrical metallic industrial device with a round opening at the front
Experimental Chamber
Close-up of an OptiDry 250 cryostat, circular metallic instrument
Optical Window
Close-up of an OptiDry 250 cryostat with connectors, company PASQAL SAS with address in Joinville-le-Pont, France, contact email, phone number, serial number #2025-2106, and website www.mycryofirm.com.
Feedthrough
Person wearing orange gloves assembling an OptiDry 250 cryostat, putting a shiny metallic cylindrical component on top of a high-tech device
50 K Shield
Person wearing orange gloves and a blue shirt using a screwdriver to work on an OptiDry 250 cryostat a reflective metallic cylindrical device mounted on a grey base.
50 K Shield mounting
Close-up of an OptiDry 250 cryostat, gold-colored circular electronic surface view
3 K Cold Plate
Hands wearing teal gloves handling an OptiDry 250 cryostat, circular metallic device with a gold circuit board and optical components
CryoBreadBoard
Person with teal gloves using adjusting components inside an OptiDry 250 cryostat
Feedthrough panel
Person wearing orange gloves working with precision on an OptiDry 250 cryostat
CryoCase
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OptiDry 250 cryostat, black and white scheme
pulse-tube cooling icon
Pulse-tube cooling

Closed-cycle, low-maintenance operation

experimental platform icon
Experimental platform

Ø250 mm gold-plated copper breadboard

optical access icon
Optical access

Five ports, compatible with 2-inch optics

configurable interfaces icon
Configurable interfaces

DC, RF, HV and optical-fiber feedthroughs

magnet field option
Magnetic-field option

Split-pair magnets up to 7 T

OptiDry 250 cryostat, technical schematic diagram illustrating a mechanical system with two labeled points, 1 and 2. The system includes a motor labeled 'Motor 3V,' a connecting rod, and a fixed support structure. Dimensions show a total length of 720 mm between two fixed supports.

1

CryoCase

The CryoCase houses the cryocooler and provides an additional experimental space below 3 K. Three removable panels provide easy access to the experimental area. An optional 1 K stage is available for SNSPD cooling.

2

CryoBreadBoard

The CryoBreadBoard is the main experimental area: a low-vibration optical breadboard operating below 3 K, with a configurable experimental volume of up to Ø250 mm × 300 mm. It provides five optical access ports and can be equipped with an optional 1 K sample stage.

Specifications

Temperatures

Base temperature

3 K guaranteed; temperatures below 3 K are achievable under no-load conditions

Temperature stability

<1.5 mK at base temperature, <100 mK from 5 K to 100 K

Cooling power

>300 mW at 4.2 K guaranteed

Vibration

RMS vibration

<10 nm typical

Peak-to-peak displacement

<30 nm on each axis over a 0.1 Hz–5 kHz measurement bandwidth

Measurement conditions

Measured at 3 K on an optical table with active pneumatic vibration isolation

Experimental space

Cold breadboard

Ø250 mm gold-plated OFHC copper breadboard

Optical access

Five ports: four lateral and one top port

Standard optical ports

44 mm inner diameter; accommodates nominal 2-inch optical windows

3 K intermediate space

150 mm × 75 mm × 200 mm experimental space without optical access

Interfaces

Wiring

24 DC lines as standard

RF cabling

Available on request

Optical fiber feedthroughs

Available on request

Operations

Cooldown time

Approximately 6.5 hours without a magnet; cooldown time depends on configuration and thermal load

Vacuum level when cold

Typically in the 10⁻⁸ mbar range

Warm-up

Less than 3 hours to reach 300 K, depending on configuration

Fields of application

Custom options

Need more space?
Ask about OptiDry 375
Tell us about your optical layout, sample environment, wiring needs, magnetic-field requirements, or target temperature range. Our team will help define the right OptiDry configuration for your setup.
Magnetic field
Low-temperature RF probe station
Temperature option & inner cell
Low working distance
OptiDry 375
Have a specific inquiry?

Get in touch

A cryogenics engineer will review your request and get back to you shortly
My Cryo Firm
1 quai Gabriel Péri, Bâtiment H
94340 Joinville-le-Pont, France
contact@mycryofirm.com
+33 9 54 99 11 19
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+33 9 54 99 11 19