Design of a Dual Wavelength Birefringent Filter

Treviño‐Palacios, Carlos G.; Wetzel, Christian; Zapata-Nava, Oscar Javier; Wetter, Niklaus Ursus; Frejlich, Jaime

doi:10.1063/1.2926893

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…The previous THz filters often operated at a single frequency, becoming the main barrier to be used in multiwavelength THz functional devices. In many emerging THz applications, dual-wave filters play an important role [4,[29][30][31][32][33]. Figure 5 illustrates the structure of the dual-wave filter.…”

Section: Transmission Properties Of the Narrow-band Filtermentioning

confidence: 99%

Light-controlled tunable terahertz filters based on photoresponsive liquid crystals

De-Xian¹,

Li²,

Jin³

2018

Laser Phys.

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We theoretically propose and investigate a light-controllable narrow-band terahertz (THz) filter and a dual-wavelength filter employing a square lattice photonic crystal with point and line defects. The point defects filled the photoresponsive liquid crystal. The change of the refractive index of the liquid crystal mixture material caused by the linearly polarized ultraviolet (UV) light and visible light results in a shift of the resonant wavelength of the cavity in the filter. We calculate transmittance spectra for the proposed THz wave filters, which have a full width at half maximum of 10 GHz and a transmittance of 95% at the resonant frequencies. By changing the polarized directions of UV and visible light, the performance characteristics of the filters can be adjusted.

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Section: Transmission Properties Of the Narrow-band Filtermentioning

confidence: 99%

Light-controlled tunable terahertz filters based on photoresponsive liquid crystals

De-Xian¹,

Li²,

Jin³

2018

Laser Phys.

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“…They enable control of the laser line intensities by fine adjustment of their rotation angle. Birefringent tuning plates have been shown to produce dual-wavelength continuouswave laser operation in Ti:sapphire [36,37], Yb:KGW [38], Cr: Nd:GSGG [39], and Cr:LiSAF [39].…”

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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“…As in a standard laser tuning BRF, the bandwidth of the transmitted peaks is determined by the number of passes through the filter which is controlled in a laser by the cavity mirrors' reflectivity. A detailed explanation of this dual wavelength filter is given elsewhere, including the body of a patent [25,26]. BRF BB is the narrow broadband filter and BRF DW is the thick filter as described in the text.…”

Section: Birefringent Filtermentioning

confidence: 99%