Raman

Contents

Overview

The LabRAM HR UV-NIR instrument is a single stage dispersive Raman microscope system with an 800 mm high-resolution spectrograph. The Raman/laser filtering is based on edge filters in an injection/rejection configuration. The system is adapted to a PARK XE-100 AFM system.


General information

Location of the Raman in Nanotalo (black square)

Pdf manuals and software

Technical details

Lasers and optics

  • Helium-neon laser:
    • 633 nm @ 30 mW (estimated power on sample 17 mW)
  • Argon laser:
    • 488 nm @ 40 mW
    • 514 nm @ 50 mW
    • possible upgrade: 457 nm @ 10 mW
  • Infrared diode laser:
    • 785 nm @ 100 mW
  • Laser spot diameter: < 1 μm
  • Laser filter: edge filter allowing Stokes measurements above 100 cm-1
  • Attenuation filters: 0 dB, -3 dB, -6 dB, -10 dB, -20 dB, -30 dB, -40 dB (motorized)
  • Optics spectral range: 220...1600 nm

Optical microscope

  • Model: Olympus BX41
  • Stage: motorized XYZ stage with PC and joystick control
    • scan area 75 × 50 mm (X × Y)
    • step size 0.1 μm
    • allows automated acquisition of Raman maps
  • Light source: top and bottom
  • Objectives:
    • 10x, NA = 0.25, WD = 10.6 mm
    • 20x, NA = 0.35, long-WD (SLMPL)
    • 50x, NA = 0.75, WD = 0.37 mm
    • 100x, NA = 0.9, WD = 0.21 mm
  • Optical camera: μEye UI-1540SE-C-BG

Spectrograph

  • Focal length: 800 mm
  • Gratings:
    • Visible light: 600 gr/mm and 1800 gr/mm (76x76 mm, motorized)
    • Infrared: 1200 gr/mm (76x76 mm, has to be changed manually)
  • Spectral resolution: 0.35 cm-1/pixel (at 633 nm with 1800 gr/mm grating)
  • Motorized entrance slit used as a confocal pinhole (continuously adjustable)
  • Axial confocal performance: < 2 μm (dependent on pinhole size)

Detector

  • Type: CCD
  • Resolution: 1024x256 (pixel size 26x26 μm)
  • Operating temperature: -70 °C
  • Spectral range: 200...1050 nm
  • Quantum efficiency: > 30 % (500...800 nm)
  • Typical read-out noise: 4 e- (rms)
  • Dark noise: < 0.002 e-/(pixel⋅s)

AFM adaptation

  • Commuting mirror for beam path selection
  • Objective: 50x, long-WD (SLMPL)
  • Beam angle: 30°
  • Optical camera: uEye UI-1220SE-C-HQ


Booking System

In order to obtain access to the equipment you should be registered as a user and make a reservation via the Cryohall reservation page. Contact Alexander Savin for details (registration and access to the booking system).

For user training and Raman-related problems contact the main user Matti Tomi.


User List