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Microstat®HiResII liquid helium (LHe) continuous flow cryostat for high resolution optical microscopy/spectroscopy
A liquid helium cooled, vacuum loading continuous flow (CF) optical cryostat with extremely low sample vibration and sample drift at both constant and changing temperatures.
- Extremely low sample vibration and drift to maintain high resolution measurements over many hours
- 2.7 - 500 K temperature range
- Very short working distance - only 2.2 mm
- Compact, light weight system - only 1.5 kg, and less than 49 mm deep
- Operation in any orientation
- Choice of reflectance (one window) or transmission (two windows) configuration
Typical applications include:
- micro-Raman and micro-photoluminescence (µPL) mapping of semiconductor microstructures with sub-micron spatial resolution
- µPL quantum dot (QD) measurements - even down to single-photon counting
Ideal for use with microscope-based spectrometers
Stock available now! Get your MicrostatHiResII even faster - now available from stock for shipment within 3 weeks of order1. Use the Enquiries form or email us to reserve your system.
1subject to your choice of window material
Operation
The MicrostatHiResII optical cryostat works on a continuous flow principle using an oil-free pump to draw liquid helium from a storage vessel along a transfer tube to the heat exchanger ("pull mode"). Temperature control is achieved by a combination of automatic or manual helium flow control and power dissipated in an electrical heater, regulated using a temperature controller.
The cryostat can also be used in "push mode", in that case the flow of liquid helium is generated by pressurising the storage dewar. The advantage is that the need for a gas flow pump is removed, eliminating the vibration and noise generated by the pump and reducing system cost.
Options
- Windows
- A wide range of window materials can be fitted to the MicrostatHiResII - see the 'Windows for optical cryostats guide' in Downloads and Links
- A 0.5 mm thick Spectrosil B quartz window with 10 mm clear access is fitted as standard. We also offer an option for a 25 mm access diameter window with a thickness of 1.5 mm
- Transmission experiments use an alternative bottom flange with a second window fitted and a transmission sample holder
- Additional or replacement window flanges available via the Oxford Instruments Direct - Cryospares® on-line catalogue
- Pump options
- A simple GF4 oil-free vane pump is supplied for operation to 3.2 K
- Lower temperatures to 2.7 K use an EPS40 single-stage rotary pump
- Temperature controller
- Flexible single- or 3-channel ITC503
- Transfer tubes
- Choose a low loss transfer tube (LLT600 for horizontal operation or LLT700 for vertical operation) for minimum helium consumption. The transfer tube can be fitted with a horizontal or vertical entry arm
- An automated needle valve can be fitted to the LLT to allow automation of the helium flow regulation and optimisation of the helium consumption
- Alternatively use a TTL200 lightweight liquid helium transfer tube
- Magnetic field
- The MicrostatHiresII can also be fitted/retrofitted with a pillar for easy integration in a room temperature bore superconducting magnet or an electromagnet (see image below); the standard cap and the pillar are interchangeable
- For an integrated 5 T magnetic field solution see the MicrostatMO
Software control
- Oxford Instruments electronics products are controllable through the OxSoft software using RS232, ISOBUS or GPIB interfaces
- LabVIEW virtual instruments are provided for Oxford Instruments electronics products to allow full PC-based control and monitoring. These can be integrated into a complete LabVIEW data acquisition system
Pillared MicrostatHiresII for use with superconducting (RT bore) or electro-magnet - with vertical transfer tube inlet (optional)
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OI Direct - Cryospares®
Browse our on-line Oxford Instruments Direct - Cryospares catalogue, offering you an extensive range of cryogenic products, spare parts, accessories and consumables. AUTUMN/FALL SPECIAL OFFERS ON NOW Click here (opens in new window) »
Downloads and Links
- MicrostatHiResII product information
(160Kb)
- Windows for optical cryostats guide
(135kb)
- Application Note - Low temperature photoluminescence (PL) spectroscopy on quantum dots
(1.37Mb)
- Application Note - Studying the optical properties of self-assembled quantum dots
(179kb)
- Application Note - The impure hearts of semiconductors
(423kb)
- Electronics for cryogenic systems - specifications
(2.47Mb)
- Thermometry and temperature sensor guide
(969kb)
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