Equipment for optical spectroscopy

Kurze Beschreibung

Laboratory equipment to be installed at the chair for Semiconductor Nanostructures and Quantum Systems (Prof. J. J. Finley) at the Walter Schottky Institut of the Technical University of Munich. The tender is divided into five lots (1-5) and consists of: 1) Liquid Cryogen-free Optical Spectroscopy Cryostat with 2-axis Vector Magnet. 2) Liquid cryogen-free Optical Spectroscopy Cryostat and Optical Table. 3) A Continuously Tunable CW Laser System. 4) A Femtosecond Ti:Sapphire pulsed laser system. 5) An IR and MIR superconducting single photon detection system.

Beschreibung der Beschaffung

Lot 1 - Liquid Cryogen-free Optical Spectroscopy Cryostat with 2-axis Vector Magnet. The cryostat will be used to perform magneto-optical spectroscopy in the infrared (1-4µm) spectral range on semiconductor samples using free-space optical access to the low-temperature environment. The system should be top-loading, provide a base temperature <2K, and use a fully automatic gas handling system to cool the sample down to the base temperature. The system must be particularly vibration-free and have long-term stability. The cryostat should be a closed system that does not consume coolant during operation. Furthermore, the system should not use He3. The system should feature a 2-axis vector magnet capable of reaching 9T along the optical axis at the position of the sample and 3T perpendicular to the optical axis. It should be delivered with a quick-change sample holder attached to a 3 axis low-temperature, non-magnetic piezoelectric positioner capable of positioning the sample in three orthogonal spatial dimensions with a precision <300nm, reproducibility <3µm within a >4 x 4 x 4 mm volume. Other details can be found in the technical specifications of Lot 1. Lot 2 - Liquid cryogen free optical spectroscopy cryostat and optical table. The closed cycle cryostat will be used to perform optical spectroscopy in the infrared (0.9-3.5µm) spectral range on semiconductor samples using free-space optical access into the low-temperature environment. The system should provide a base temperature <5K, maximum temperature >310K and use a fully automatic gas handling system to control sample temperature. The cryostat should be a closed system that does not consume coolant during operation. Furthermore, the system should not use He3. The delivered system must feature a 1500mm x 2100mm optical table and a piezoelectric positioner capable of positioning the sample in three orthogonal spatial dimensions with a precision <300nm, reproducibility <3µm over a 4 x 4 x 4 mm range of travel within the low temperature environment. Other details can be found in the technical specifications of Lot 2. Lot 3 - Continuously Tunable CW Laser System The tunable laser system will be used to perform optical spectroscopy measurements of advanced semiconductor samples. It shall (at least) be tunable over the spectral range 1000-1500nm (NIR) and 1700-3350nm (IR) and be delivered with a wavemeter allowing for the emission frequency to be controlled with a precision <1 THz. The emission linewidth should be <1 MHz at all wavelengths, and the system should provide >100mW output power at all wavelengths. Systems continuously tunable over the entire range 1000 - 3350nm, and those providing higher average output power will be favoured. The emission frequency of the system should be controllable using a computer to allow for it to be integrated into an automated measurement system. Other details can be found in the technical specifications of Lot 3. Lot 4 - Femtosecond Ti:Sapphire pulsed laser system The tunable laser system will be used as a pump laser for an existing Coherent OPO system (Chameleon Compact OPO) to perform optical spectroscopy measurements of advanced semiconductor samples. The supplied system shall be (at least) be tunable over the spectral range 700-1000nm (vis NIR) and must be qualified (listed on the OPO datasheet) as a pump laser for the existing OPO system to allow it to provide the specified output in the 1000-1600nm (signal) and 1750-3800nm (idler) spectral ranges. NOTE: The idler beam path of the Coherent OPO system is not currently available and must be installed as an upgrade to the existing system. This upgrade is part of the current lot. The system should provide specified >3.5W average output power at 800nm and a pulse duration <140fs and a repetition frequency of 80 MHz. Moreover, when used in conjuction with the OPO, the idler should provide a power >80mW over the entire spectral range specified above. The emission frequency of the combined Ti:Sapphire / OPO system should be controllable using a unified computer interface to allow for it to be integrated easily into an automated measurement system. Other details can be found in the technical specifications of Lot 4. Lot 5 - IR and MIR Superconducting Single Photon Detector System The SSPD system will be used to perform optical spectroscopy measurements of advanced semiconductor samples in the NIR and IR spectral ranges. It shall (at least) provide two channel detectors optimised at 1310nm and 1550nm and two sets detectors optimized at 2300nm and 3000nm, respectively. Preference will be given to suppliers capable of meeting the performance metrics in the 2300nm and 3000nm spectral ranges. The final total shall include freight, warranty, installation, and training costs. Moreover, the system should be delivered and installed within 20 weeks of placing the order. Other details can be found in the technical specifications of Lot 5.