Modelocked femtosecond laser emits at 2420 nm

A room-temperature, long-wavelength (2 to 3 µm) femtosecond laser would be useful for high-harmonic generation in the deep-UV or soft-x-ray regions, or as a pump source to create even-longer-wavelength IR femtosecond pulses via parametric or Raman conversion. Researchers at Koç University and Teknofil (both in Istanbul, Turkey) have created such a laser, using chromium-doped zinc selenide (Cr2+:ZnSe) as a gain medium. The laser produces 95 fs pulses at a pulse-repetition rate of 94.3 MHz and an average power of 40 mW.

A 5 W thulium fiber laser operating at 1800 nm end-pumps the laser cavity, which contains a 2.4-mm-long Cr2+:ZnSe crystal. Two magnesium fluoride prisms were inserted in the cavity to create a Kerr-lens modelocking configuration with a cavity dispersion of -1700 fs2 at 2420 nm. The full-width half-maximum pulse width was 95.2 fs, assuming a sech2 pulse profile, while the wavelength spectrum had a width of 69 nm; the resulting time-bandwidth product of 0.335 was almost identical to what would be expected for a transform-limited sech2 pulse (0.315). The laser operated continuously and stably for up to 15 minutes; longer periods will be achieved with better optical mounts, say the researchers. Contact Alphan Sennaroglu at asennar@ku.edu.tr.

Most Popular Articles

Magazine


Click here to have your products listed in the Laser Focus World Buyers Guide.

RELATED PRODUCTS

Phantom ir300

The Phantom ir300 provides extended spectral response beyond visible light spectrum up ...

Miro Airborne

Miro Airborne is a high-speed camera designed for airborne applications.

Phantom Miro Family

The Phantom Miro family are small, lightweight digital high-speed cameras.

RELATED COMPANIES

Photonics Bretagne

Offers a cluster composed of research centers, schools and companies all in the field o...

Raw Communications

Provider of marketing services in the fiber optic data communications industry includin...

XiO Photonics B V

Offers strong competence in integrated optical products for visible light applications....

Social Activity

  •  
  •  
  •  
  •  
  •  
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS