High power 404 nm source based on second harmonic generation in PPKTP of a tapered external feedback diode laser

Lundeman, Jesper Holm; Jensen, Ole Bjarlin; Andersen, Peter E.; Andersson‐Engels, Stefan; Sumpf, B.; Erbert, G.; Petersen, Paul Michael

doi:10.1364/oe.16.002486

Cited by 30 publications

(18 citation statements)

References 21 publications

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“…1, is based on the same configuration that we reported in [6] with the pump source of similar design as reported in [7]. The laser output was 1.4 W measured before the isolator, and 1.2 W at the input of the external doubler resonator.…”

Section: Methodsmentioning

confidence: 99%

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

et al. 2009

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We present a measurements series of the efficiency of periodically poled KTP used for second harmonic generation in an external phase locked cavity. Due to the high absorption (0.01cm -1 ) in the PPKTP crystal at the pump wavelength a strong thermal dephasing of the periodically poled grating is observed for high pump powers. For four different resonator setups, it was experimentally found that a threshold parameter could be defined as the ratio between the focal intensity in the crystal and the single pass conversion efficiency. The value of this threshold for the onset of strong thermal dephasing was found to be 1.41·10 10 W 2 m -2 in our 30 mm long PPKTP sample. This threshold parameter marks the onset of thermally induced instability that leads to a degradation of the SHG conversion efficiency. Above the threshold the shape of the resonance peaks of the resonator changed from symmetrical into triangular making phase locking difficult.

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Section: Methodsmentioning

confidence: 99%

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

et al. 2009

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“…A 318 mW, 404 nm frequency doubled diode laser was shown suitable for drug quantification measurements in a mouse model as part of photodynamic therapy [194,195]. The fluorescence initiated by the diode laser radiation helped to examine the drug uptake as well as its distribution, giving information about the location of tumors and its boundaries to healthy tissue.…”

Section: Biomedical Applications In the Visible Spectral Rangementioning

confidence: 99%

Diode laser based light sources for biomedical applications

Müller

Marschall

Jensen

et al. 2012

Laser & Photonics Reviews

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Diode lasers are by far the most efficient lasers currently available. With the ever-continuing improvement in diode laser technology, this type of laser has become increasingly attractive for a wide range of biomedical applications. Compared to the characteristics of competing laser systems, diode lasers simultaneously offer tunability, high-power emission and compact size at fairly low cost. Therefore, diode lasers are increasingly preferred in important applications, such as photocoagulation, optical coherence tomography, diffuse optical imaging, fluorescence lifetime imaging, and terahertz imaging. This review provides an overview of the latest development of diode laser technology and systems and their use within selected biomedical applications. 670 nm external cavity diode laser for Raman spectroscopy built on a 13 × 4 mm 2 microbench (Copyright FBH/Schurian.com).

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“…The SHG radiation will have only half the linewidth of the pump beam [29] and is hence well suited for isotope-selective photoionization. A drawback of using diode lasers for SHG is their elliptical beam shape [28], which reduces the conversion efficiency. To optimize the second harmonic power we therefore use an anamorphic prism pair (see Fig.…”

Section: Second Harmonic Generation At 423nm In Ppktpmentioning

confidence: 99%

Two-color photoionization of calcium using SHG and LED light

et al. 2010

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We present a photoionization method to load single 40 Ca ions in a linear Paul trap from an atomic beam. Neutral Ca I atoms are resonantly excited from the ground state to the intermediate 4s4p 1 P 1 -level using coherent 423nm radiation produced by single-pass second harmonic generation in a periodically poled KTiOPO 4 crystal pumped with an 120mW extended cavity diode laser. Ionization is then attained with a high-power light emitting diode imaged to the trap center, using an appropriately designed optical system composed of standard achromatic doublet lenses. The setup simplifies previous implementations at similar efficiency, and it hardly requires any maintenance at all.

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High power 404 nm source based on second harmonic generation in PPKTP of a tapered external feedback diode laser

Cited by 30 publications

References 21 publications

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

Diode laser based light sources for biomedical applications

Two-color photoionization of calcium using SHG and LED light

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