All-intracavity fourth harmonic generation in a passively mode locked VECSEL for ultrafast UV emission

Meyer, Jason T.; Lukowski, Michal; Hessenius, Chris; Wright, E. M.; Fallahi, Mahmoud

doi:10.1016/j.optcom.2021.127255

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Figure 3 is a series of images where ultrafast ultraviolet outputs were generated with average output powers >500uW. 6 The figure shows the pulse width of the fundamental in the few picosecond range (the autocorrelator was unable to measure UV light), an image of the UV output (two spots due to a dichroic splitter being used), and the measured wavelength. VECSELs have also shown the ability to generate higher order modes.…”

Section: Resultsmentioning

confidence: 99%

Coupled cavity vertical external cavity surface emitting lasers

Hessenius

2023

Vertical External Cavity Surface Emitting Lasers (VECSELs) XII

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The open cavity concept of a VECSEL is often used to incorporate a variety of intracavity elements including: filters, nonlinear crystals, and SESAMs. This leads to expanded device performance over the fundamental chip design and leads to: larger spectral coverage, single frequency operation, short pulse generation, etc. Coupled cavity VECSELs designs where multiple laser cavities can be overlapped in order to allow for even more advanced output characteristics.

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Section: Resultsmentioning

confidence: 99%

Coupled cavity vertical external cavity surface emitting lasers

Hessenius

2023

Vertical External Cavity Surface Emitting Lasers (VECSELs) XII

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“…After that, all-intracavity fourth harmonic with a BBO crystal in a mode-locked OP-SDL was demonstrated by Meyer et al in 2021, which buildup the circulating power of the second harmonic for frequency quadrupling the fundamental 1060 nm to 265 nm. The measured ultraviolet pulse has an average power of 525 µW and a repetition rate of 510 MHz [17].…”

Section: Introductionmentioning

confidence: 99%

Repetition-rate-tunable second harmonic generation in mode-locked optically pumped semiconductor disk laser

Zhuang¹,

Hua²,

Tian³

et al. 2022

Laser Phys. Lett.

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We demonstrated a repetition-rate-tunable second harmonic mode-locked optically pumped semiconductor disk laser (OP-SDL), and the tuning range was from 1.168 GHz to 1.25 GHz. The entire tuning process was continuous, and OP-SDL was always in a mode-locked working state. To the best of our knowledge, this is the first work to obtain intracavity repetition rate tunable second harmonic laser in an OP-SDL. At same time, the repetition rate of fundamental wave can be continuously adjusted from 1.16 GHz to 1.66 GHz. The central wavelengths of the pulse trains were around 971 nm, and the highest repetition rate signal-to-noise ratio was more than 60 dB, indicating that the mode-locked pulses were stable.

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“…三倍频方面, 2009年, Shu等 [19] 设计M型腔 VECSEL, 基频光发射波长为1064 nm, 采用在腔内不同臂中分别插入非线性晶体LBO进行倍频和频, 得到了450 mW的紫外输出功率, 紫外激光波长为355 nm; 2016年, Polanik和Alexander [20] 设计了Z型折叠腔结构VECSEL, 将和频晶体和倍频晶体一前一后放置放在靠近后端镜的束腰处, 来提高转换效率消除走离角, 在327 nm处获得了最大输出功率为23 mW的紫外激光. 四倍频方面, 2008年Kaneda和Yarborough [21] 通过近红外976 nm光泵浦VECSEL的非线性频率转换, 在244 nm波长处获得215 mW的连续输 [22] 度, 明显提升频率转换的效率 [23][24][25] . 此外, 还可以…”

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Tunable ultraviolet laser based on intracavity third harmonic generation of external cavity surface emitting laser

Cheng,

Wu,

Yan

et al. 2024

Acta Phys. Sin.

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Ultraviolet laser has high frequency, short wavelength, large single-photon energy, and high spatial resolution, and has wide applications in many fields such as fine processing, life sciences, spectroscopy, etc. This paper reports a wavelength tunable ultraviolet laser based on intracavity third harmonic generation using an external-cavity surface-emitting laser. The W-type resonant cavity of the laser is composed of a distributed Bragg reflector (DBR) at the bottom of the gain chip, three plane-concave mirrors, and a rear plane mirror. On the arm containing the gain chip, a birefringent filter is inserted at the Brewster angle as the polarization and wavelength tuning element, which also can narrow the linewidth of the fundamental laser to a certain extent. A type-I phase-matched LBO crystal is placed on the beam waist between the folding mirrors M2 and M3 to convert the 980 nm fundamental laser to 490 nm blue light, and a type-I phase-matched BBO crystal is inserted on the beam waist near the rear mirror to produce 327 nm ultraviolet output from the remained 980 nm fundamental laser and the frequency-doubled 490 nm second harmonic. Before the BBO crystal, a half wave plate at 980 nm is employed to change the polarization of the fundamental laser, so to meet the type-I phase-matching condition of the used BBO crystal. Thanks to the larger nonlinear coefficient of the type-I phase-matched BBO crystal, and its obviously higher transmittance at 327 nm wavelength than the usually used LBO crystal, an output power of 538 mW at 327 nm ultraviolet wavelength, corresponding to a conversion efficiency of 1.1% from pump light to ultraviolet laser, is achieved. The experiment is performed under conditions of 15 ℃ temperature, 47 W absorbed pump power, 5 mm-length LBO and 5 mm-length BBO crystals. By using a 2 mm-thickness birefringent filter as the tuning element, 34.1 nm tuning range of the 980 nm fundamental laser, 14.3 nm tuning range of the 490 nm second harmonic, and 8.6 nm tuning range of the 327 nm third harmonic are obtained. The ultraviolet laser exhibits good beam quality as well as acceptable power stability with the maximum power fluctuation less than 2% within 4.5 hours.

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All-intracavity fourth harmonic generation in a passively mode locked VECSEL for ultrafast UV emission

Cited by 6 publications

References 20 publications

Coupled cavity vertical external cavity surface emitting lasers

Coupled cavity vertical external cavity surface emitting lasers

Repetition-rate-tunable second harmonic generation in mode-locked optically pumped semiconductor disk laser

Tunable ultraviolet laser based on intracavity third harmonic generation of external cavity surface emitting laser

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