Linewidth narrowing of a tunable mode-locked pumped continuous-wave Ce:LiCAF laser

Wellmann, Barbara; Kitzler, Ondřej; Spence, David J.; Coutts, David W.

doi:10.1364/ol.40.003065

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Using the single grating, the laser output was tunable over a range of 18 nm from 281 nm to 299 nm. The tuning range we have achieved is wider compared to the previously reported birefringent tuning using single and multiple MgF 2 Brewster tuning plates in a modelocked pumped continuous-wave Ce:LiCAF laser [26].…”

Section: Resultsmentioning

confidence: 58%

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Tunable narrow linewidth picosecond pulses from a single grating gain-switched Ce:LiCAF laser

Pham¹,

Cadatal-Raduban²,

Pham³

et al. 2018

Laser Phys.

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We report a gain-switched laser oscillator configuration for generating tunable short and narrow spectral linewidth 290 nm laser pulses from a Ce:LiCAF crystal. Continuous tuning of the laser emission over a range of 18 nm from 281 nm to 299 nm is achieved using a single grating in a low-Q short-cavity oscillator. The shortest pulse duration achieved is 450 ps at 281 nm and the narrowest spectral linewidth is 0.17 nm at 287 nm. The average output energy ranged between 0.5 mJ and 0.8 mJ, resulting to conversion efficiencies of 8%-10%, depending on the output wavelength. The simplicity of our configuration makes aligning easier as well as reduces the loss in laser output energy, thereby leading to improved laser efficiency.

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Section: Resultsmentioning

confidence: 58%

“…Linewidth narrowing has been demonstrated in a modelocked pumped continuous-wave (CW) Ce:LiCAF laser by using a combination of MgF 2 plates and etalons, which narrowed down the linewidth to 0.75 pm [26][27][28][29]. Despite this remarkable result, short pulses with narrow linewidths are important for certain applications.…”

Section: Introductionmentioning

confidence: 99%

Tunable narrow linewidth picosecond pulses from a single grating gain-switched Ce:LiCAF laser

Pham¹,

Cadatal-Raduban²,

Pham³

et al. 2018

Laser Phys.

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show abstract

“…On top of this, as also pointed out by Kobtsev et al [1], some of the earlier papers on off-surface optic axis birefringent filter design contain some errors, and optimal performance of these elements has not been fully described in the literature (in some cases not even correctly understood). Lastly, these earlier work mostly focused on optimization of birefringent filter properties for dye lasers which are relatively narrowband and to our knowledge there is limited study on optimization of BRF properties for today's broadly tunable lasers such as Ce:LiCAF [10,11], Ti:Sapphire [12], Cr:ZnSe [13,14], and Fe:ZnSe [15].…”

Section: Introductionmentioning

confidence: 99%

Off-surface optic axis birefringent filters for smooth tuning of broadband lasers

Demırbas¹

2017

Appl. Opt.

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Transition metal-doped gain media such as Ce:LiCAF, Ti:Sapphire, Cr:ZnSe and Fe:ZnSe possesses wide gain bandwidths that could provide ultra broadly tunable laser output with the usage of adequate intracavity tuning elements. Birefringent filters (BRFs) are a low-cost and easy to use solution for tuning. However, for ultrabroad gain media, regular on-surface optic axis BRFs could not provide smooth tuning of laser wavelength in the whole emission range. Basically, regular BRFs could not accommodate a large enough free spectral range with acceptable modulation depth variation while tuning due to their slow tuning rates. Motivated by this, in this study we have numerically investigated the effect of optic axis orientation on filter parameters for magnesium fluoride birefringent tuning plates. We have shown that, a magnesium fluoride BRF with an optic axis diving by 30 into the plate could provide smooth tuning of ultra-broad laser gain media. A similar analysis has shown that for broadband tuning applications the optimum optic axis diving angle lies around 25 for crystal quartz BRFs. The proposed filters have the potential to be useful in tuning of broadband lasers in continuous-wave, long-pulsed and femtosecond operation regimes.

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Achromatic Deep Ultraviolet Lens Using Novel Optical Materials

Minami

Cadatal-Raduban

Kuroda

et al. 2020

Physica Status Solidi (b)

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The development of an achromatic lens in the deep ultraviolet (DUV) region is reported. The dispersion and Abbe numbers of lithium calcium aluminum fluoride (LiCaAlF6), magnesium fluoride (MgF2), lithium fluoride (LiF), calcium fluoride (CaF2), and fused silica (SiO2) are investigated in the wavelength range from 200 to 300 nm to determine appropriate material combinations for minimizing chromatic aberration in a doublet. Based on the results of these investigations, a prototype DUV objective lens is fabricated using a LiCaAlF6 (convex lens)SiO2 (concave lens) doublet. The objective lens has a focal length of 10 mm, working distance of 2 mm, and numerical aperture (NA) of 0.2. The objective lens is evaluated to have a chromatic aberration of about 2.8% and resolution of at least 2 μm. It is also evaluated to have a smaller spherical aberration compared with a reflective objective lens with a similar NA.

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Linewidth narrowing of a tunable mode-locked pumped continuous-wave Ce:LiCAF laser

Cited by 5 publications

References 14 publications

Tunable narrow linewidth picosecond pulses from a single grating gain-switched Ce:LiCAF laser

Tunable narrow linewidth picosecond pulses from a single grating gain-switched Ce:LiCAF laser

Off-surface optic axis birefringent filters for smooth tuning of broadband lasers

Achromatic Deep Ultraviolet Lens Using Novel Optical Materials

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