Efficient high-power terahertz beating in a dual-wavelength synchronously mode-locked laser with dual gain media

Huang, Yihong; Tzeng, Y. S.; Tang, C. Y.; Chiang, Shou-Chih; Liang, H. C.; Chen, Yung-Fu

doi:10.1364/ol.39.001477

Cited by 41 publications

(17 citation statements)

References 18 publications

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“…Still, as seen from Fig. 9 [55,56] report multicolor operation in a few pairs of transitions, whereas in our study we have obtained multicolor operation in 14 different wavelength groups. As indicated before, this is the advantage of using the BRF filter with a c-axis out of the crystals surface, which provides a rich range of filter parameters from a single device.…”

Section: Multicolor Laser Operation With Cr:nd:gsggcontrasting

confidence: 47%

Multicolor lasers using birefringent filters: experimental demonstration with Cr:Nd:GSGG and Cr:LiSAF

Demırbas¹,

Uecker²,

Fujimoto³

et al. 2017

Opt. Express

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Abstract:In this study, we numerically and experimentally investigate application of birefringent filters (BRFs) as frequency selective elements in multicolor lasers. A BRF plate made out of crystalline quartz with an arbitrarily oriented optical axis has been explored. Simulation results have shown that compared to regular BRFs where the optical axis lies in the plane of the plates surface, a BRF with an optical axis pointing out of its surface enables design flexibility in filter parameters, providing access to a wider set of free spectral range and bandwidth values. As a result, multicolor operation could be obtained in many wavelength pairs using a single BRF plate. In the experiments a 3-mm thick quartz BRF with an optical axis 45° to the surface plane has been used. With Cr:Nd:GSGG as a laser medium two-color and three-color cw laser operation has been demonstrated in 11 and 3 different transition combinations, respectively. Moreover, two-color laser operation has been demonstrated in 10 different wavelength pairs in Cr:LiSAF. To our knowledge, this study is the first detailed investigation and experimental demonstration of BRFs with tilted optical axis for multicolor operation of solid-state lasers. Compared to other methods, BRFs enable a rich selection of transition pairs and also the ratio of the power in each line could be regulated by fine adjustment of the rotation angle. Implementation of tilted-axis BRFs should boost development of efficient and low-cost multicolor lasers in other gain media as well. 449-451 (1997). 6. S. Pan, X. Zhao, and C. Lou, "Switchable single-longitudinal-mode dual-wavelength erbium-doped fiber ring laser incorporating a semiconductor optical amplifier," Opt. Lett. 33(8), 764-766 (2008). 7. C. W. Chow, C. S. Wong, and H. K. Tsang, "All-optical NRZ to RZ format and wavelength converter by dualwavelength injection locking," Opt. Commun. 209(4-6), 329-334 (2002). 7231-7242 (2007). 10. J. B. Abshire, "Pulsed multiwavelength laser ranging system for measuring atmospheric delay," Appl. Opt.19 ( 202-208 (1985). 33. S. Zhu, "Birefringent filter with tilted optic axis for tuning dye lasers: theory and design," Appl. Opt. 29(3), 410-415 (1990). 34. X. Wang and J. Yao, "Transmitted and tuning characteristics of birefringent filters," Appl. Opt. 31(22), 4505-4508 (1992). 35. H. Wu, C. Zhang, and X. Bai, "A complete description of polarization and transmission of nonnormal incident rays in a uniaxial birefringent plate with arbitrary optic axis," Opt. Commun. 283(21), 4129-4134 (2010).

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Section: Multicolor Laser Operation With Cr:nd:gsggcontrasting

confidence: 47%

Multicolor lasers using birefringent filters: experimental demonstration with Cr:Nd:GSGG and Cr:LiSAF

Demırbas¹,

Uecker²,

Fujimoto³

et al. 2017

Opt. Express

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“…Besides this, the technique can also be used to equate the output intensities for the dual wavelength emission without any custom designed mirrors or inserting any OSEs. The dual-wavelength emissions from two series crystals has been demonstrated using a variety of pairs of laser crystals including Nd : YVO 4 /Nd : GdVO 4 [14], Nd : YVO 4 /Nd : KGW [15], Nd : YVO 4 /Nd : LuVO 4 [15], Nd : YAG/Nd : YLF, and Nd : YLF/Nd : YLF [3]. To date, most of the reported end-pumping series crystal lasers are operated in pulsed mode, and the highest reported O-O efficiency was 33% [15].…”

Section: Introductionmentioning

confidence: 99%

Efficient Dual-Wavelengths Continuous Mode Lasers by End-Pumping of Series Nd:YVO4 and Nd:GdVO4 Crystals and Speckle Reduction Study

Mohamed

Zhang

et al. 2019

Photonics

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In this paper, diode pumped solid state (DPSS) lasers based on end-pumping series N d : Y V O 4 and N d : G d V O 4 crystals were studied. Dual-, tri-, and quad-wavelength emissions were achieved. In the dual-wavelength emission operation, an optical-to-optical efficiency (O-O) of 48.9% and the power instability was 0.4% were obtained. These are the most efficient and compact lasers operating in continuous wave mode reported to date with series crystals. Besides this, the effect of changing power ratio between the output laser powers on speckle reduction was investigated for the first time. In addition, tri and quad wavelength emissions were achieved with a reasonable efficiency simply by optimizing the cavity parameters.

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“…In particular, two-color mode-locked laser operation has been attracting a great deal of attention due to potential usage of such lasers in application like generation of coherent terahertz waves and formation of ultrahigh pulse repetition rates by optical beating. Simultaneous dual/tri-wavelength mode-locked laser operation with picosecond pulses has been shown in many Nd-based laser gain media, including Nd:LYSO [18], Nd:SYSO [19], Nd:LGGG [20][21][22], Nd:CNGG [23], Nd:CLTGG [24], Nd:GdVO 4 [25], Nd:YVO 4 ∕Nd:GdVO 4 [26][27][28], Nd:GAGG [29], Nd:YVO 4 ∕ Nd:LuVO 4 [30], Nd:YVO 4 ∕Nd:KGW [30], Nd:YSAG [31], Nd:YAG [32,33], Nd:YAP [34], and Nd:Gd:SrF 2 [35]. In these works, operating in a multiwavelength regime was established using different techniques such as usage of disordered multicenter crystals with inhomogeneously broadened emission spectrum [22], and/or operating with cavity mirrors with specially designed reflectivity properties [33], enrolling two different laser crystals in the cavity [26][27][28], employment of intracavity etalons [34], and by cooling the laser crystal to cryogenic temperatures [32].…”

Section: Introductionmentioning

confidence: 99%

Red-diode-pumped Cr:Nd:GSGG laser: two-color mode-locked operation

et al. 2017

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We have investigated in detail the continuous-wave (cw) and mode-locked performance of a diode-pumped Cr:Nd:GSGG laser. State-of-the-art single-mode and multimode laser diodes around 665 nm were used as pump sources. In cw operation, we have demonstrated lasing thresholds as low as 14 mW, slope efficiencies as high as 23.4%, and output powers up to 738 mW. The free running emission wavelength was 1061 nm. Lasing could also be obtained at 1051, 1058, 1065, 1068, 1072, 1103, and 1111 nm lines. A saturable Bragg reflector was used to initiate and sustain mode-locking where the Cr:Nd:GSGG laser produced 6-ps-long pulses around 1061 nm with an average power of 160 mW. The repetition rate was 142.65 MHz, resulting in pulse energies of 1.1 nJ and peak powers of 175 W. An off-surface optical axis quartz birefringent filter (BRF) was inserted inside the laser cavity at Brewster's angle to obtain two-color cw and mode-locked laser operation at the 1051 and 1058 nm and 1058 and 1061 transition pairs, resulting in cw powers up to 60 mW and cw mode-locked average powers up to 45 mW. Unlike many other methods applied for two-color mode-locked laser operation, usage of the BRF enabled regulation of the ratio of the power in each line by fine adjustment of its rotation angle. The method could potentially be used for other gain media as well, which could simplify development of multicolor solid-state laser systems.

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Efficient high-power terahertz beating in a dual-wavelength synchronously mode-locked laser with dual gain media

Cited by 41 publications

References 18 publications

Multicolor lasers using birefringent filters: experimental demonstration with Cr:Nd:GSGG and Cr:LiSAF

Multicolor lasers using birefringent filters: experimental demonstration with Cr:Nd:GSGG and Cr:LiSAF

Efficient Dual-Wavelengths Continuous Mode Lasers by End-Pumping of Series Nd:YVO4 and Nd:GdVO4 Crystals and Speckle Reduction Study

Red-diode-pumped Cr:Nd:GSGG laser: two-color mode-locked operation

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