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In this webcast, we discuss:

  • Important performance parameters to consider when selecting a laser for Raman spectroscopy experiments
  • Different laser technologies and how the performance impacts the Raman experiment

Key Learning Objectives:

  • What performance parameters should be considered when selecting a laser for Raman spectroscopy
  • How this performance can affect the Raman experiment data

Thanks for all questions from the webcast, here is a few questions and answers, feel free to send in more to sales@hubner-photonics.com:

Your questions:

What is the difference between 08-DPL and 04-01 Series. Is there a bragg filter inside the 08-DPL? What do you mean with optical isolator?

Answer:

  • The 08-DPL and 04-01 series have much in common. When comparing an 08-DPL with an 04-01 of same wavelength and power, they have the same cavity design and most of the internal optics is identical. Hence, the performance is very similar. Note however that the 04-01 series is offered at some additional wavelengths, power levels and configurations – please see the datasheets on our webpage (https://hubner-photonics.com/) for more info.

To point out some key differences between 08-DPL and 04-01 Series:

  • Size 
  • 08-DPL has all electronics integrated in the laser head while 04-01 series has an external controller
  • 08-DPL comes with integrated spectral filter as standard (but available as option also in 04-01 series)
  • 08-DPL is available with integrated optical isolator in the laser head (customized solution with isolator possible also for 04-01 series)
  • 08-01 series is available with externally mounted fiber coupler, while the 04-01 series is available as with a permanently aligned fiber pigtail. (Pigtailed 08-01 series is soon to be released)
  • The spectral filter inside the 08-DPL is not a bragg filter, but a dielectric narrow band-pass filter.
  • An optical isolator is an optical component that effectively hinders any reflections from e.g. a sample to reach the laser cavity. It can be seen as an “optical diode” where the laser light is transmitted in one direction and blocked in the reverse direction. Most lasers are more or less sensitive to back reflection (or “optical feedback”) and may typically result in increased noise. In many cases such back reflections can be avoided by properly designing the optical system but if it cannot be avoided and it is recommended to use an optical isolator.

Your question:

If these solid state lasers loose power after a certain lifetime, does one have to buy a new laser? Or can the laser be repaired? What are the differences in costs?

Answer:

Our lasers have very long lifetimes in general. Often the lifetime can be prolonged by reoptimizing the internal current and temperature settings. This reoptimization can be done remotely where we remotely log in to a computer connected to the laser and adjust the settings. This is a life time support we offer free of charge on all lasers.

But the hermeticity and permanent alignment of our lasers typically does not allow any repairation or replacement of cavity components. External parts like controllers and electronics boards can of course be replaced or repaired – but electronics failures are really rare.

Your question:

Are there any predication models? How are the validation of wavelength done? Basic difference between NIR Spectroscopy & Raman spectroscopy?

Answer:

Yes, we have customers that are using Raman spectroscopy-based instruments integrated in-line in the production process and monitoring gas flow contents in petro-chemical industries. They are being used as alternatives to gas chromotographs which are conventionally used in these applications. I have been told that the Raman instruments can provide higher precision measurements, even if it’s gas substances being measured. The Raman scattering form a volatile gas is even weaker than for a solid material, so strong lasers and very good supressions of Rayleigh scattered light and fluorescence is required in thses cases.
The Rayleigh scattered light is the elastic scattering o flight, i.e the light that is scattered without loosing any of fits energy. The Raman scattered light is characteriszed by having lost a small fraction o fits energy, meaning that it gets shifted to a bit longer wavelengths. The shift is called Stokes shift. It’s also possible that the ligth gains some energy in the Raman scattering process, and gets shifted to shorter wavelengths. Then it’s called anti-Stokes shifted light.

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Also interessting reading in the same subject.
Feel free to download our white paper about Lasers for low frequesnse Raman