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Room-temperature subnanosecond waveguide lasers in Nd:YVO 4 Q-switched by phase-change VO 2 : A comparison with 2D materials

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ABSTRACT

We report on room-temperature subnanosecond waveguide laser operation at 1064 nm in a Nd:YVO4 crystal waveguide through Q-switching of phase-change nanomaterial vanadium dioxide (VO2). The unique feature of VO2 nanomaterial from the insulating to metallic phases offers low-saturation-intensity nonlinear absorptions of light for subnanosecond pulse generation. The low-loss waveguide is fabricated by using the femtosecond laser writing with depressed cladding geometry. Under optical pump at 808 nm, efficient pulsed laser has been achieved in the Nd:YVO4 waveguide, reaching minimum pulse duration of 690 ps and maximum output average power of 66.7 mW. To compare the Q-switched laser performances by VO2 saturable absorber with those based on two-dimensional materials, the 1064-nm laser pulses have been realized in the same waveguide platform with either graphene or transition metal dichalcogenide (in this work, WS2) coated mirror. The results on 2D material Q-switched waveguide lasers have shown that the shortest pulses are with 22-ns duration, whilst the maximum output average powers reach ~161.9 mW. This work shows the obvious difference on the lasing properties based on phase-change material and 2D materials, and suggests potential applications of VO2 as low-cost saturable absorber for subnanosecond laser generation.

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The emitted wavelength and pulse trace from the superficial cladding waveguide with three SAMs.Fig (a) Laser emission spectrum of the output pulsed laser from the Nd:YVO4 superficial cladding waveguide. The inserts display the laser modal profiles of TE00 and TM00 mode. (b) The typical oscilloscope traces of the Q-switched pulse with VO2 (red line), graphene (blue line) and WS2 (green line) as SAMs.
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f5: The emitted wavelength and pulse trace from the superficial cladding waveguide with three SAMs.Fig (a) Laser emission spectrum of the output pulsed laser from the Nd:YVO4 superficial cladding waveguide. The inserts display the laser modal profiles of TE00 and TM00 mode. (b) The typical oscilloscope traces of the Q-switched pulse with VO2 (red line), graphene (blue line) and WS2 (green line) as SAMs.

Mentions: In VO2 based laser system, the spectrum of output laser, centering at a wavelength of 1064 nm above the threshold of pulsed waveguide laser, is depicted in Fig. 5(a), which corresponds to the main emission line of Nd3+ ion fluorescence transition band 4F3/2 → 4I9/2. In case of graphene and WS2 SAMs, the same laser spectra have been achieved. The insert images are the near-field modal distributions of the pulsed waveguide laser for the TE and TM polarization from the surficial cladding waveguide in Nd:YVO4 crystal. It can be easily observed that the main energy of the light fields is confined in the fundamental modes, which confirms the well-confined guidance of the emission pulsed laser. Figure 5(b) presents the pulse trains of the waveguide laser under the launched pump power at 968.3 mW by using SAMs of VO2, graphene and WS2 film, respectively. The pulse trains display the efficient Q-switched laser generation from superficial cladding waveguide.


Room-temperature subnanosecond waveguide lasers in Nd:YVO 4 Q-switched by phase-change VO 2 : A comparison with 2D materials
The emitted wavelength and pulse trace from the superficial cladding waveguide with three SAMs.Fig (a) Laser emission spectrum of the output pulsed laser from the Nd:YVO4 superficial cladding waveguide. The inserts display the laser modal profiles of TE00 and TM00 mode. (b) The typical oscilloscope traces of the Q-switched pulse with VO2 (red line), graphene (blue line) and WS2 (green line) as SAMs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382777&req=5

f5: The emitted wavelength and pulse trace from the superficial cladding waveguide with three SAMs.Fig (a) Laser emission spectrum of the output pulsed laser from the Nd:YVO4 superficial cladding waveguide. The inserts display the laser modal profiles of TE00 and TM00 mode. (b) The typical oscilloscope traces of the Q-switched pulse with VO2 (red line), graphene (blue line) and WS2 (green line) as SAMs.
Mentions: In VO2 based laser system, the spectrum of output laser, centering at a wavelength of 1064 nm above the threshold of pulsed waveguide laser, is depicted in Fig. 5(a), which corresponds to the main emission line of Nd3+ ion fluorescence transition band 4F3/2 → 4I9/2. In case of graphene and WS2 SAMs, the same laser spectra have been achieved. The insert images are the near-field modal distributions of the pulsed waveguide laser for the TE and TM polarization from the surficial cladding waveguide in Nd:YVO4 crystal. It can be easily observed that the main energy of the light fields is confined in the fundamental modes, which confirms the well-confined guidance of the emission pulsed laser. Figure 5(b) presents the pulse trains of the waveguide laser under the launched pump power at 968.3 mW by using SAMs of VO2, graphene and WS2 film, respectively. The pulse trains display the efficient Q-switched laser generation from superficial cladding waveguide.

View Article: PubMed Central - PubMed

ABSTRACT

We report on room-temperature subnanosecond waveguide laser operation at 1064 nm in a Nd:YVO4 crystal waveguide through Q-switching of phase-change nanomaterial vanadium dioxide (VO2). The unique feature of VO2 nanomaterial from the insulating to metallic phases offers low-saturation-intensity nonlinear absorptions of light for subnanosecond pulse generation. The low-loss waveguide is fabricated by using the femtosecond laser writing with depressed cladding geometry. Under optical pump at 808 nm, efficient pulsed laser has been achieved in the Nd:YVO4 waveguide, reaching minimum pulse duration of 690 ps and maximum output average power of 66.7 mW. To compare the Q-switched laser performances by VO2 saturable absorber with those based on two-dimensional materials, the 1064-nm laser pulses have been realized in the same waveguide platform with either graphene or transition metal dichalcogenide (in this work, WS2) coated mirror. The results on 2D material Q-switched waveguide lasers have shown that the shortest pulses are with 22-ns duration, whilst the maximum output average powers reach ~161.9 mW. This work shows the obvious difference on the lasing properties based on phase-change material and 2D materials, and suggests potential applications of VO2 as low-cost saturable absorber for subnanosecond laser generation.

No MeSH data available.


Related in: MedlinePlus