Fast Optics Laboratory [FOL] + BLS Spectroscopy Laboratory

Laser Sources and Systems
Equipments, Setups, Tools

Laboratory Partition-1 [Laser Systems and Diagnostics]

Femtosecond Fiber Laser

• Model: EFOA-SH
• Class-3B
• Er-doped
• Wavelength = 1560 nm
• Second Harmonic Generation = 780 nm
• Pulse Energy = 10-9 Joules
• Average output power

• For 1560 nm = 160 mW
• For 780 nm = 80 mW

• Repetition rate = 70 ± 5 MHz

Intensity Autocorrelator 

• Pulse duration measurement technique
• Delay line
• SHG crystal

Argon Ion Laser

• ​Model: 35-KAP-431-240
• Class-3B
• Selectable wavelengths ranging from violet to red

• Wavelength = 457-676 nm

• Output power = 195 mW
• Switching power supplies with power-factor correction
• Air cooled
• Coherence Length ~ 10 cm
• Operating Temperature = 5°C to 40°C

Spectrum Analyzer

• Spectral analysis and wavelength measurement 
• Spectral resolution as high as 2 GHz.
• Wavelength accuracy up to ± 0.0001 nm.
• Operation available from 375 nm to 12 μm.
• Operates with CW and high-repetition rate pulsed lasers.
• Fiber-optic input for wavelengths up to 2.6 μm.
• Free-space aperture input with visible alignment aid for IR/mid-IR wavelengths.

Digital storage oscilloscope

• 60 MHz bandwidth, 400 MSa/s sample rate
• 4000-point record length for each channel
• Advanced analysis tools include digital filter with adjustable limits, mask testing and waveform recorder/replay mode
• FFT standard plus 3 additional math functions
• Extensive Trigger capabilities including pulse width and line-selectable Video trigger

​Spectrometer 

• Thorlabs CCS200/M
• Wavelength range 200nm - 1000 nm
• Rugged Czerny-Turner Spectrometer Design
• Auto Compensation for Dark Current Noise
• Amplitude Corrected and Shipped with Calibration Report
• High-Speed USB Connection Allows up to 200 Scans per Second
• Trigger Input for External Synchronization (TTL)
• 16-Bit A/D-Converter
• 3648 Pixel CCD Line Array

Laboratory Partition-2 [Dedicated to BLS Spectroscopy]

Brillouin Light Scattering Spectroscopy 

• Scanning combination of two Fabry-Perot cavities in tandem configuration on a common translation stage; triple pass on each interferometer
• Scanning range 0 ÷ 2.5 µm using a deformable parallelogram scanning stage
• Control unit of the instrument, manual PZT alignment control of the mirrors, long time stabilization using feedback loops on a reference laser beam, input shutter operation, selectable amplitude of scan, photon output counting through serial interface 
• Laser source of 532 nm center wavelength
• GHOST, analysis software
• Detection range 1 GHz to 10 GHz