Three-nanosecond-equal interval sub-pulse Nd:YAG laser with multi-step active Q-switching

Jie Mao; Chao Wang; Tixiang Hong; Yongji Yu

doi:10.3788/COL202119.071404

Journals >Chinese Optics Letters >Volume 19 >Issue 7 >Page 071404 > Article

Chinese Optics Letters
Vol. 19, Issue 7, 071404 (2021)

Three-nanosecond-equal interval sub-pulse Nd:YAG laser with multi-step active Q-switching | Editors' Pick

Jie Mao, Chao Wang^*, Tixiang Hong, and Yongji Yu

Author Affiliations

Jilin Key Laboratory of Solid Laser Technology and Application, School of Science, Changchun University of Science and Technology, Changchun 130022, China

show less

DOI: 10.3788/COL202119.071404 Cite this Article Set citation alerts

Jie Mao, Chao Wang, Tixiang Hong, Yongji Yu. Three-nanosecond-equal interval sub-pulse Nd:YAG laser with multi-step active Q-switching[J]. Chinese Optics Letters, 2021, 19(7): 071404 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Abstract

We demonstrate a three-nanosecond equidistant sub-pulse multi-step Q-switched Nd:Y₃Al₅O₁₂ (Nd:YAG) laser. In the time interval of 100–1000 ns, three pulses with the same nanosecond interval and the same peak power are obtained at the pulse width of 24 ns, 28 ns, and 36.6 ns, respectively. The energy is 32.5 mJ, and the optical efficiency is 10.8%. The multi-step Q-switched method does not require the insertion of other optical elements into the traditional Q-switched laser, and it is very suitable to obtain pulse group output with several nanosecond pulse intervals.

Keywords

multi-step Q-switching nanosecond interval pulse Nd:YAG laser

γ (t) = δ_{1} + \ln (\frac{1}{R}) + \ln {\frac{1}{\cos^{2} [\frac{π V (t)}{2 V_{λ / 4}}]}} \times {\begin{cases} V_{1}, & t_{0} < t \leq t_{1} \\ V_{2}, & t_{1} < t \leq t_{2} \\ 0, & t_{2} < t \end{cases},

(1)

View in Article

\frac{d ϕ}{d t} = \frac{2 σ n l ϕ}{t_{r}} - \frac{ϕ}{t_{c} (t)},

(2)

View in Article

\frac{d n}{d t} = - γ σ c ϕ n,

(3)

View in Article

t_{c} (t) = \frac{t_{r}}{L (t)}, w i t h L (t) = {\begin{matrix} L_{1}, & t_{0} < t \leq t_{1} \\ L_{2}, & t_{1} < t \leq t_{2} \\ L_{3}, & t_{2} < t \leq \infty \end{matrix} .

(4)

View in Article

P_{peak, m} = \frac{h v A l}{σ t_{r}} \ln (\frac{1}{R}) (g_{i, m} - g_{th, m} - g_{th, m} \ln \frac{g_{i, m}}{g_{th, m}}),

(5)

View in Article

g_{i} - g_{th} = g' \ln (\frac{g_{i}}{g_{th}}),

(6)

View in Article

P_{peak} = \frac{h v A l}{σ t_{r}} \ln (\frac{1}{R}) (g' - g_{th}) \ln (\frac{g_{i}}{g_{th}}) .

(7)

View in Article

(g' - g_{th}) \ln (\frac{g_{i}}{g_{th}}) = C,

(8)

View in Article

g_{i} - g_{f} = g_{th} \ln (\frac{g_{i}}{g_{f}}),

(9)

View in Article

t_{p} = t_{r} \frac{g_{i} - g_{f}}{g_{i} - g_{th} [1 + \ln (g_{i} / g_{th})]},

(10)

View in Article

E_{out} = \frac{h v A}{2 σ γ} \ln (\frac{1}{R}) \ln (\frac{g_{i}}{g_{f}}) .

(11)

View in Article

Jie Mao, Chao Wang, Tixiang Hong, Yongji Yu. Three-nanosecond-equal interval sub-pulse Nd:YAG laser with multi-step active Q-switching[J]. Chinese Optics Letters, 2021, 19(7): 071404

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information