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Continuous-Flow Optical Cryostat

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Cryogenic Equipment

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Designed for high-precision domain imaging, micro-optical imaging, and high-spatial resolution photoluminescence applications, with low vibration and low drift, the continuous-flow optical cryostat series of Truth Instruments provides a continuous cryogenic environment for samples with temperature variations from 4.2–420 K. The series of cryostats are all capable of achieving vibrations at the nanometer scale.

● The Cryostat-C-50 Microscopy Cryostat is designed with a continuous flow of liquid helium/liquid nitrogen. Liquid helium/liquid nitrogen enters the cryostat through the inlet from the transport tube, and then passes through the capillary tube before arriving at the heat exchanger inside the cryostat. The heat exchanger is fitted with a heater and a temperature sensor for high-precision control of the sample temperature. The samples are arranged in vacuum, effectively avoiding sample frosting at low temperatures.

● Designed with a heat exchanger that extends the cold finger upward, the Cryostat-C-50-Mag can be adapted to different types of magnetic field equipment and meet the optical testing requirements under cryogenic magnetic fields.

● The Cryostat-S-50 series of compact cryogenic optical cryostat, also designed with a continuous flow, achieves vibrations at the nanometer scale consistent with the microscopy cryostat series.

● The Cryostat-S-50, with a thickness of only 45 mm, is more compatible with the narrow air gap of the electromagnet.

● The Cryostat-S-50-Mag, designed with a cold finger extending forward on the basis of the compact cryogenic optical cryostat, ensures that the sample position is under both the in-plane and vertical magnetic fields.

● It is widely used in the low-temperature high-magnetic-field microdomain laser Kerr microimaging system of Truth Instruments.

● The wide temperature range covers the testing requirements from the liquid helium/liquid nitrogen temperature region to 420 K.

● High temperature stability, with temperature fluctuation <±50 mK

● Compact design for easy integration into all types of optical microscopes

● Short working distance design, with a customized distance from the sample stage to the window

● The support design with low heat leakage and high strength allows for ultra-low vibrations at the nanometer scale

● Compact cold finger design for easy coupling of magnetic fields

● Convenient quick release design for easy sample change

● A variety of optical and electrical sample holder designs are available to meet various optical and electrical measurement requirements

Microscope cryostat	Liquid nitrogen cooling	Liquid helium cooling
Sample space	Standard features: sample holder with a 4-pin electrical interface, and sample size up to 10 mm × 10 mm; support customization
Working distance (the distance from the sample holder to the window)	Standard features: 6 mm; support customization
Dimensions of magnetic field extensions (adapted to Cryostat-C-50-Mag only)	Standard features: 20 mm × 21 mm; support customization
Temperature control range	80 K–325 K (420 K optional);	4.2 K–325 K (420 K optional);
Temperature sensor input	Cernox® Temperature Sensor
Temperature stability	<±50 mK
Cooling time	<30 min from 300 K to 80 K	<60 min from 300 K to 4.2 K
样Drift at the sample	<1 μm/1 h
Vibration level at the sample	<±50 nm in the X and Y directions
Vacuum degree (at the base temperature)	<1 × 10^-3 Pa
Refrigerant consumption	Liquid nitrogen consumption <0.5 L/h at 80 K	A closed cooling cycle using helium liquefied gas, with no consumption
Window options	Standard: Fused quartz glass, available in fused quartz, BK7, sapphire and other materials
Cable options	Cryogenic cables with cold sink, available in cryogenic twisted pair wires, flexible coaxial and triaxial cables, etc.
Vacuum feedthrough	Optional: multi-probe and SMA (optional BNC electrical junction box)
Cooling source configuration	Self-pressurizing liquid nitrogen tank: Volume: optional 30 L, 50 L, and 100 L; Operating pressure: 0.15 MPa; Daily loss rate: 3%	Helium liquefier: GM cooler capacity: 1.5 W at 4.2 K; Helium liquefaction rate: 15 L/day; Cooling time: 2 h; Water cooling unit: flow rate 7–9 L/min, and temperature range 5–25°C