Yb-fiber-laser-pumped, high-repetition-rate picosecond optical parametric oscillator tunable in the ultraviolet

Samanta, G. K.; Kumar, S. Chaitanya; Aadhi, A.; Ebrahim-Zadeh, M.

doi:10.1364/oe.22.011476

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…Currently, UV sources consist mostly of gas lasers, 5 lamps, or diodes 1 or rely on nonlinear optical processes, such as third/fourth harmonic generation or optical parametric oscillators (OPOs). 6,7 Fiberized laser sources could be an attractive alternative to conventional UV sources. Fiber based light sources exhibit excellent beam quality, extraordinary brightness, small detrimental thermal effects, and high temporal stability.…”

confidence: 99%

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Wang

Barua

et al. 2017

APL Photonics

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confidence: 99%

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Wang

Barua

et al. 2017

APL Photonics

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“…Due to unavailability of suitable lasers to produce output pulses at high rep. rate from an OPO through synchronous pumping22, the high rep. rate OPOs are realized through two common experimental schemes: high harmonic23 and fractional incremental16 cavity configurations. In case of high harmonic cavity, where the OPO cavity length is 1/ N times that of the pump laser to produce an output pulse train with N times the RR of the laser23.…”

Section: Methodsmentioning

confidence: 99%

Multi-gigahertz, femtosecond Airy beam optical parametric oscillator pumped at 78 MHz

Aadhi

Sharma

Chaitanya

et al. 2017

Sci Rep

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We report a high power ultrafast Airy beam source producing femtosecond pulses at multi-gigahertz (GHz) repetition rate (RR). Based on intra-cavity cubic phase modulation of an optical parametric oscillator (OPO) designed in high harmonic cavity configuration synchronous to a femtosecond Yb-fiber laser operating at 78 MHz, we have produced ultrafast 2D Airy beam at multi-GHz repetition rate through the fractional increment in the cavity length. While small (<1 mm) crystals are used in femtosecond OPOs to take the advantage of broad phase-matching bandwidth, here, we have exploited the extended phase-matching bandwidth of a 50-mm long Magnesium-oxide doped periodically poled LiNbO3 (MgO:PPLN) crystal for efficient generation of ultrafast Airy beam and broadband mid-IR radiation. Pumping the MgO:PPLN crystal of grating period, Λ = 30 μm and crystal temperature, T = 100 °C using a 5-W femtosecond laser centred at 1064 nm, we have produced Airy beam radiation of 684 mW in ~639 fs (transform limited) pulses at 1525 nm at a RR of ~2.5 GHz. Additionally, the source produces broadband idler radiation with maximum power of 510 mW and 94 nm bandwidth at 3548 nm in Gaussian beam profile. Using an indirect method (change in cavity length) we estimate maximum RR of the Airy beam source to be ~100 GHz.

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“…In the absence of suitable periodically poled nonlinear materials offering ready availability, wide transparency, and first-order quasiphase-matching in the UV, borate-based birefringent crystals have proved the most viable candidates for UV generation. In particular, due to their broad transparency and high damage threshold, β-BaB 2 O 4 (BBO) and LiB 3 O 5 (LBO) have become materials of choice for the development of high-energy pulsed UV sources, despite their relatively low optical nonlinearities of ∼2 pm∕V and ∼0.7 pm∕V, respectively.On the other hand, the birefringent nonlinear crystal BiB 3 O 6 (BIBO), also belonging to the borate family of materials, possesses unique linear and nonlinear optical properties for frequency conversion from the infrared to the visible and UV [4][5][6][7][8][9][10]. As a biaxial crystal, it offers highly flexible phase-matching characteristics for various nonlinear interactions in the three optical planes.…”

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confidence: 99%

“…On the other hand, the birefringent nonlinear crystal BiB 3 O 6 (BIBO), also belonging to the borate family of materials, possesses unique linear and nonlinear optical properties for frequency conversion from the infrared to the visible and UV [4][5][6][7][8][9][10]. As a biaxial crystal, it offers highly flexible phase-matching characteristics for various nonlinear interactions in the three optical planes.…”

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confidence: 99%

“…For SFG to 355 nm, BIBO offers an effective nonlinearity, d eff ∼ 3.2 pm∕V, compared to ∼1.8 pm∕V in BBO and ∼0.7 pm∕V in LBO, with a corresponding figure-of-merit (FOM d 2 eff ∕n 3 ) that is 2.5 time larger than BBO and 16.4 times larger than LBO for the same process. This makes BIBO highly attractive for efficient frequency conversion of low-energy, high-repetition-rate, picosecond pulses into the UV [10]. Recently, two new borate-based nonlinear crystals, CsB 3 O 5 (CBO) and La 2 CaB 10 O 19 (LCB), were reported to generate watt-level picosecond UV radiation at 355 nm [11,12].…”

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Stable, high-power, Yb-fiber-based, picosecond ultraviolet generation at 355 nm using BiB_3O_6

2015

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We report a stable, high-power, high-repetition-rate, picosecond ultraviolet (UV) source at 355 nm based on singlepass sum-frequency generation of a mode-locked Yb-fiber laser at 1064 nm in the nonlinear crystal BiB 3 O 6 . By performing single-pass second-harmonic generation (SHG) in a 30-mm-long LiB 3 O 5 crystal, up to 9.1 W of average green power at 532 nm is obtained at a single-pass SHG efficiency of 54%. The generated green pulses have a duration of 16.2 ps at a repetition rate of 79.5 MHz, with a passive power stability better than 0.5% rms and a pointing stability <12 μrad over 1 h, in high beam quality. The green radiation is then sum-frequency-mixed with the fundamental in a 10-mm-long BiB 3 O 6 crystal, providing as much as 1.2 W of average UV power, at an infrared-to-UV conversion efficiency of 7.2%, with a passive power stability better than 0.4% rms over 3 h and a pointing stability <45 μrad over 1 h, in TEM 00 spatial profile. . For many years, the development of such ultrafast sources has relied almost entirely on nonlinear optical techniques based on third (∼355 nm) and fourth (∼266 nm) harmonic generation of widely established mode-locked Nd/Yb-doped solid-state lasers at ∼1064 nm. The rapid advances in fiber laser technology in recent years, however, have paved the way for the replacement of bulky, water-cooled, mode-locked solidstate lasers with compact, air-cooled, ultrafast Yb-fiber lasers at ∼1064 nm. With the availability of multiwatt average powers, and the potential for further power scaling, the exploitation of mode-locked Yb-fiber lasers thus offers great promise for the realization of efficient and high-power picosecond UV sources in more practical designs by deploying third and fourth harmonic generation schemes. On the other hand, to fully exploit the advantages of fiber lasers with regard to a compact architecture, simplicity, and portability, it would also be crucial to deploy the most direct nonlinear techniques for UV generation in order to preserve those important merits. To this end, single-pass conversion schemes offer the most effective approach to achieve this goal. We have already verified the viability of such single-pass schemes in combination with continuous-wave (cw) and modelocked Yb-fiber lasers for efficient generation of highpower cw radiation in the green and UV [4], and high-average-power picosecond pulses in the green [5]. Recently, a fiber-based femtosecond green source was also demonstrated [6]. At the same time, a critical factor in the attainment of the highest nonlinear conversion efficiency and output power is the choice of suitable nonlinear materials. For UV generation, this choice is particularly limited and is especially challenging when low-intensity picosecond pulses at high repetition rates are involved. In addition to a wide transparency in the UV, of paramount importance are a sufficiently high effective nonlinearity, low spatial walk-off, high optical damage threshold, low transmission loss, and high optical quality, as well as chemical and the...

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Yb-fiber-laser-pumped, high-repetition-rate picosecond optical parametric oscillator tunable in the ultraviolet

Cited by 29 publications

References 22 publications

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Multi-gigahertz, femtosecond Airy beam optical parametric oscillator pumped at 78 MHz

Stable, high-power, Yb-fiber-based, picosecond ultraviolet generation at 355 nm using BiB_3O_6

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