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Sub-50 ps pulses at 620 nm obtained from frequency doubled 1240 nm diamond Raman laser
Optics Express
|December 10, 2017
Summary
A novel monolithic diamond Raman laser generates 1240 nm pulses with high efficiency. This laser system was then used to create 620 nm pulses, demonstrating a flexible method for accessing difficult wavelengths.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Diamond Raman lasers offer a pathway to new wavelengths.
- Short pulse generation is crucial for various scientific applications.
- Accessing visible light spectra from infrared lasers can be challenging.
Purpose of the Study:
- To develop a monolithic diamond Raman laser operating at 1240 nm.
- To investigate the frequency doubling of the 1240 nm output to the visible spectrum.
- To demonstrate a versatile and efficient method for short pulse generation at new wavelengths.
Main Methods:
- A 0.5-mm thick planar diamond was used as the gain medium.
- The diamond was pumped with ~100 ps pulses from a Q-switched 1064 nm laser.
- Second-harmonic generation was achieved using a lithium triborate (LBO) crystal.
Main Results:
- The diamond Raman laser produced 42-62 ps pulses at 1240 nm with 246 mW average power and 25% conversion efficiency.
- Frequency doubling yielded 29-46 ps pulses at 620 nm with 128 mW average power and 50% efficiency.
- The system demonstrated efficient pulse shortening and wavelength extension.
Conclusions:
- Monolithic diamond Raman lasers are effective for generating specific wavelengths.
- This approach provides an efficient route to visible light generation from infrared lasers.
- The method offers a simple and flexible mechanism for short pulse generation and wavelength manipulation.
