Conference Paper

Recent advances in Cr: Colquiriite laser technology

Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA
DOI: 10.1109/LEOS.2009.5343217 Conference: LEOS Annual Meeting Conference Proceedings, 2009. LEOS '09. IEEE
Source: OAI


We summarize recent progress in low-cost and highly-efficient Cr:Colquiriite laser technology. Pumping with inexpensive single-mode diodes, 270-mW of output power and a total tunability from 754 to 1042 nm were demonstrated in continuous-wave operation. In mode-locked operation, 100-fs pulses with 50-nJ pulse energy were demonstrated.

Download full-text


Available from: Umit Demirbas, Mar 05, 2014
19 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: LiCaAlF<sub>6</sub>:Cr<sup>3+</sup> (Cr<sup>3+</sup>:LiCAF) exhibits an intrinsic (extrapolated maximum) slope efficiency of 67%. For comparison, the intrinsic slope efficiencies of BeAl<sub>2</sub>O <sub>4</sub>:Cr<sup>3+</sup> (alexandrite), Na<sub>3</sub>Ga<sub>2</sub>Li<sub>3</sub>F<sub>12</sub>:Cr<sup>3+</sup> and ScBO<sub>3</sub>:Cr<sup>3+</sup> were found to be 65, 28, and 26%, respectively. The tuning range of LiCaAlF<sub>6</sub>:Cr<sup>3+</sup> was determined to be at least 720-840 nm. The conventional spectroscopic properties, such as the absorption, emission, and emission lifetimes as a function of temperature, are reported as well
    IEEE Journal of Quantum Electronics 12/1988; 24(11-24):2243 - 2252. DOI:10.1109/3.8567 · 1.89 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We describe the generation of enhanced pulse energies using a multipass-cavity (MPC) Cr[superscript3] +:LiCAF laser, pumped by inexpensive, single spatial mode laser diodes. A semiconductor saturable absorber was used for stable mode-locked operation. The MPC reduced the pulse repetition rate to the ~10 MHz level, scaling pulse energies and intensities. With only 540 mW of absorbed pump power, 98 fs pulses with energies of 9.9 nJ and peak powers of ~101 kW, corresponding to 95 mW of average power at a repetition rate of 9.58 MHz, were generated. By increasing the intracavity negative dispersion, 310 fs pulses with energies of 15.2 nJ and peak powers of ~49 kW, corresponding to 160 mW of average power at 10.51 MHz repletion rate, were also generated. These results demonstrate that low-cost MPC Cr[superscript 3+]-doped colquiriite lasers can generate pulse energies and intensities comparable to more expensive Ti:sapphire lasers.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Multi-photon microscopy (MPM) is a powerful tool for biomedical imaging, enabling molecular contrast and integrated structural and functional imaging on the cellular and subcellular level. However, the cost and complexity of femtosecond laser sources that are required in MPM are significant hurdles to widespread adoption of this important imaging modality. In this work, we describe femtosecond diode pumped Cr:LiCAF laser technology as a low cost alternative to femtosecond Ti:Sapphire lasers for MPM. Using single mode pump diodes which cost only $150 each, a diode pumped Cr:LiCAF laser generates approximately 70-fs duration, 1.8-nJ pulses at approximately 800 nm wavelengths, with a repetition rate of 100 MHz and average output power of 180 mW. Representative examples of MPM imaging in neuroscience, immunology, endocrinology and cancer research using Cr:LiCAF laser technology are presented. These studies demonstrate the potential of this laser source for use in a broad range of MPM applications.
    Optics Express 01/2009; 16(25):20848-63. DOI:10.1364/OE.16.020848 · 3.49 Impact Factor
Show more