1-02_PR_68-7049-18_Specifications_FINAL.docx

CLOSED-CYCLE OPTICAL CRYOSTAT FOR SCANNING RAMAN, PHOTOLUMINESCENCE MICROSCOPY, AND ELECTRICAL TRANSPORT

DESCRIPTION: This system consists of a closed-cycle cryostat for optical microscopy that has very low vibration at the sample and can reach a sample temperature of 4 K or below. A compressor, cryostat, control electronics, and integrated vacuum compatible microscope objective must be included. Positioners within the cryostat to move the sample in all three dimensions relative to a microscope objective must be included. Additional sample space must be included that is compatible with wire-bonded samples with corresponding electrical feedthroughs. The system must also have the ability to sweep the sample temperature over the full temperature range and rapidly sweep the temperature over smaller temperature ranges with minimal optical drift.

REQUIREMENTS:

· Sample temperature range: 4 K or below to 350 K with temperature control

· Temperature stability: better than 20 mK.

· Cool down time to base temperature 4 K: 4 hours or less.

· Temperature Stabilization Time: 2 min or less for 50 K temperature change

· Temperature Stability: 2 mK or better.

· Cooling power at 4K: 100 mW or greater

· Vibration at the sample: Less than 100 nm mounted on positioners

· Drift:

· Less than 1 µm/K for full temperature range

· Less than 20 mm for full temperature range

· Optics:

· Multiple optical access ports including one low working distance window

· Sample mounted to allow for working distance less than 5 mm

· Uncoated fused silica window for 200 nm - 2000 nm wavelength experiments

· Internal Vacuum Compatible Optics

· Sample mount to allow for XYZ scanning of sample in front of internal objective.

· No windows between objective lens and sample

· Temperature controlled objective lens at/or above room temperature

· Specifications: 100x magnification, NA of 0.75 or greater, and a working distance of 1 mm or greater.

· Cryogenic Compatible Sample Positioning: o Independent X, Y, Z, control

· Total range in all three dimensions: 5 mm

· Control type and resolution:

· Closed loop control for all three dimensions

· Positioning Resolution of 10 nm.

· Positioner control electronics must be included.

· Electrical feedthroughs:

· Feedthroughs for the sample positioners.

· Feedthroughs for local sample temperature controller and thermal sensors.

· At least four (4) feedthroughs for electrical biasing of sample.

· At least two (2) microwave/RF coax feedthroughs with the coax terminated in the sample space. This wiring must operate at frequencies up to 5 GHz.

· Contractor must provide software with a graphical user interface (GUI), to control the system from a single computer.

· Contractor must provide control electronics to include:

· Positioning controllers.

· Temperature controllers.

· Computer for interfacing with the temperature and position controllers via a graphical user interface (GUI).

· The sample/experimental volume:

· Must accommodate horizontal and vertical mounting of samples.

· Horizontally mounted sample volume (with laser perpendicular to sample surface and along z-axis): 50 mm (x) by 50 mm (y) by 10 mm (z)

· Vertically mounted sample volume (with laser perpendicular to sample surface and along x-axis): 5 mm (x) by 25 mm (y) by 25 mm (z)

· The sample mount(s):

· The sample space must be able to accommodate thin sample with 0.5 mm thickness.

· Contractor will provide three (3) removable chip mounts that include:

· At least 6 electrical pads for wire bonding.

· An adaptor for compatibility with standard 16 pin dual inline package receptacles.

· Reusable connectors or electrical terminations for interfacing the electrical connections of the chip mounts with the DC and RF electrical feedthroughs.

· Power Consumption and Temperature Regulation:

· Air cooled compressor.

· Peak power consumption of 4.5kW of electrical power during cool down.

· Cables / Helium Hoses:

· Contractor to provide all needed power and electrical cabling for the operation of the cryostat, vacuum pump, power supplies, temperature control electronics, and computer interfacing.

· Contractor to provide 10 ft. helium flex hose set

· Supporting Documentation

· The contractor must provide sample temperature vs. time data during cool-down for a representative system and a description for how the data was collected.

· The contractor must provide temperature stability data for a representative system and a description for how the data was collected.

· The contractor must provide performance data for a representative system during temperature cycling (5K to 350 K) and a description for how the data was collected; performance data must include:

· Temperature vs. time

· Vibration stability vs. time

· Focal-point stability vs. time

· The contractor must provide schematic diagrams of the representative system components and should provide schematic diagraphs of the proposed system components.

· The contractor must provide a warranty on the entire system for at least 1 year.

· The contractor must provide on-site installation.

· The contractor must provide an on-site system demonstration and operational training.

ORIGINAL SPECIFICATIONS FOR PR 68-7049-18 - CRYOSTAT PAGE 3 OF 3