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  • Picosecond Pulsed Diode Lasers
Jul 2011
PicoQuant GmbHRequest Info
BERLIN, July 19, 2011 — PicoQuant GmbH has unveiled 500- and 510-nm picosecond pulsed diode laser heads. Green laser emission is not generated by wavelength conversion techniques but directly by a semiconductor laser diode. The availability of the new wavelengths opens the door for applications in bioanalytics, biochemistry, genetics, semiconductor characterization and quality control.

The laser heads are suitable for exciting fluorescent proteins such as EYFP, mCitrine and Venus, and for widely used fluorescent dyes such as Alexa 514, Atto 520 and Oregon Green. They also fill a demand for alternatives to frequency-doubled solid-state lasers and argon-ion types in applications such as fluorescence microscopy. With pulse durations as short as 130 ps, the laser heads match the time resolution of mainstream detectors at a price lower than that of mode-locked lasers. The two laser heads also are available in a dual-mode version that allows picosecond pulsed as well as continuous-wave operation.

The company’s LDH series diode laser family now covers the wavelength range from 375 to 1990 nm. All laser heads are supplied with collimator optics that can optionally be fitted with optical fibers. The new laser heads are compatible with the company’s PDL series diode laser drivers.

The LDH-P-C-510 model has a center wavelength of 510 ±10 nm, a repetition rate from single shot to 40 MHz, a pulse width of <130 ps full width half maximum (FWHM) at average power of 0.3 mW at a 40-MHz repetition rate and a pulse width of <600 ps FWHM at average power of 2 mW at the same repetition rate. Average output power in continuous-wave mode is 10 mW.

The LDH-P-C-500 has a center wavelength of 500 ±10 nm and a repetition rate from single shot to 40 MHz. Pulse width is <130 ps FWHM at average power of 0.5 mW at a 40-MHz repetition rate, and <500 ps FWHM at average power of 2 mW at the same repetition rate. Average output power in continuous-wave mode is 5 mW.


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fluorescence microscopy
Observation of samples using excitation produced fluorescence. A sample is placed within the excitation laser and the plane of observation is scanned. Emitted photons from the sample are filtered by a long pass dichroic optic and are detected and recorded for digital image reproduction. 
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