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.

Get All the Laser Focus World News Delivered to Your Inbox

Subscribe to Laser Focus World Magazine or email newsletter today at no cost and receive the latest news and information.

 Subscribe Now

Most Popular Articles

Webcasts

Understanding Polarization and Optical Coatings

Light is an electromagnetic wave, but, at optical frequencies, it is its electric field that interacts with materials, with the direction of the electric fie...

In-Situ Infrared Sensing using Calibration-Free Scanned-WMS Laser Absorption Spectroscopy

This presentation, sponsored by Wavelength Electronics and ILX Lightwave, will discuss the range of sensing capabilities offered by scanned-WMS in the near- ...

Mid-infrared lasers in remote chemical sensing – from stand-off detection to atmospheric sounding

In this webcast, Gerard Wysocki of MIRTHE will discuss the unique remote-sensing capabilities enabled by modern mid-infrared (mid-IR) lasers and novel spectr...

Femtosecond Lasers – Getting the Photons to the Work Area

Ultrashort-pulse lasers, both picosecond and femtosecond, are now available from a large number of manufacturers, with new players entering the field at a ra...

Ray Optics Simulations with COMSOL Multiphysics

The Ray Optics Module can be used to simulate electromagnetic wave propagation when the wavelength is much smaller than the smallest geometric entity in the ...

Multichannel Spectroscopy: Technology and Applications

This webcast, sponsored by Hamamatsu, highlights some of the photonic technology used in spectroscopy, and the resulting applications.

White Papers

Tamarisk® Custom Lens Calibration

Though the Tamarisk product line is optimally designed to suit a variety of end-uses, DRS has dev...

NIST Traceable Spectral Responsivity Calibration of Photodiode Detectors

All Newport optical detectors are recommended for a 12 month recalibration interval. Newport main...

Accurate LED Source Modeling Using TracePro

Modern optical modeling programs allow product design engineers to create, analyze, and optimize ...
Technical Digests

Fiber for Fiber Lasers

The development of higher-power and higher-energy fiber lasers has benefited from many advances i...

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

PRESS RELEASES

SCHOTT North America and Space Photonics, Inc. Sign Exclusive Licensing Agreement for Covert Communications Technology

01/22/2013 WASHINGTON, D.C.—October 18, 2012—Space Photonics Inc. and SCHOTT North America, Inc. today annou...

SCHOTT and Applied Microarrays Establish Distribution Partnership for NEXTERION® Products

01/22/2013 SCHOTT and Applied Microarrays, Inc. have established a partnership for the distribution of SCHOT...
Social Activity
  •  
  •  
  •  
  •  
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved. PRIVACY POLICY | TERMS AND CONDITIONS