Photoluminescence (PL) - Lens Set-up
The sample is mounted on a sample holder placed on an optical insert in the magnet with fields up to 33T. The excitation and detection light is guided through a lens and filter system to the sample and the photoluminescence is sent back to the measurement system. The sample can be oriented in Faraday or Voigt geometry.
The experiments can be performed with all laser and light measurement systems. The polarization can be controlled externally by Glan Taylor polarizers and broad-band retardation plates.
For set-ups at low temperatures two types of cryostats are available:
- Bath cryostat 1.2K and 4.2K
- Flow cryostat 4 - 300K
PL - Fiber Set-up
The sample is mounted on a sample holder placed on an optical insert in the magnet with fields up to 33T. The excitation and detection light is guided with fibers to the sample and back to the measurement system. The sample can be oriented in Faraday geometry and Voigt geometry.
The experiments can be performed with all laser and light measurement systems. The polarization is controlled by in-situ polarizer's and retarder's. UV and VIS fibers are available.
Low temperature experiments can be done with:
- He4 1.2K and 4.2K
- He3 0.35K
- Flow cryostat 4 - 300K
PLE - Fiber Set-up
Measurement of optical properties for a material by changing the excitation wavelength in a magnetic field. The sample is mounted on a fiber coupled probe in which excitation light from a tunable laser is focused on a sample. Luminescence of the sample is collected by a mirror and focused into the detection fiber. The excitation end emission light is guided through polarizer's. The sample is oriented in the Faraday geometry.
The experiments can be performed with all laser and light measurement systems. The polarization is controlled by in-situ polarizer's and retarder's. UV and VIS fibers are available.
Low temperature experiments are performed in a bath cryostat at 1.2K and 4.2K.
PL Imaging and Micro Raman
This set-up facilitates fluorescence microscopy in high magnet fields. Two inserts can be used, one up to 31T (50 mm bore), the other up to 33 T (32 mm bore). The sample is placed in the optical insert on a sample stage that consists of three Attocube piezo-positioners. This provides a delicate XYZ positioning of the sample. The insert can be equipped with different (up to 40x) microscope objectives.
The insert is homemade from carbon and Titanium material. This minimizes the sensitivity for displacement at high magnetic fields.
The sample can be orientated in Faraday or Voigt geometry.
The experiments can be performed with all laser and light measurement systems.
Low temperatures: Bath cryostat at 1.2K and 4.2K
Microscope Imaging set-up, including Schlieren polarized microscopy
Different imaging inserts allow a visual study of organism's, materials or solutions in high magnetic fields. The sample can be placed at different positions in the magnet, experiencing fields up to 33T and field x field gradients up to 6600 T2/m. The insert has a cuvette holder for Helma or homemade cuvettes. A mirror and lens system guides the detection light to a Sony CCD camera equipped with a sophisticated Zoom-lens. The imaging can be adjusted from low magnification to a resolution of 1 micrometer.
The sample illumination with LED's permits incident and/or transmitted light.
Movies or pictures are recorded with a computer.
A Schlieren insert with knife edge is available.
- Cuvette sizes up to 10x10mm
- Resolution up to 1 micrometer
- Adjustable temperatures between 4- 100°C ± 0.1°C
Birefringence, Linear Dichroism, Circulair dichroism and Circulair birefringence
This set-up measures the linear or circular birefringence, linear or circular dichroism of a material induced by a magnetic field up to 33T.The Hellma cuvette with the solution is placed in a cuvette holder in the insert. All available lasers or a Xenon lamp can be used for illumination modulated by a photo-elastic modulator (PEM, 50 kHz)) The transmitted light is guided to an optical fiber to a Si photodetector.
- Hellma Cuvette thickness 0.1 - 1mm
- Adjustable temperatures between 4- 100°C ± 0.1°C
Polarized UV-VIS probe
This experimental set-up is used for polarized absorption measurements inside a magnetic field up to 33T. Unpolarized light from a Halogen, Deuterium or Xenon lamp is guided with an optical fiber to the solution in a Hellma cuvette that is placed in the optical insert. The transmitted light passes a polarizer and is then focused into a fiber that guides the light to a spectrometer. The absorption spectra can be measured for any polarization with respect to the field direction.
- Ocean Optics spectrometer 300 - 1100nm
- Hellma Cuvette thickness 0.1 - 1mm
- Adjustable temperatures between 4 - 100°C ± 0.1°C