Wavelength Tuning Characteristics of Nd：YAG/Cr4+：YAG Laser Based on Volume Bragg Grating

Peibei MENG; Ming QI; Wei RONG; Menglong LI; Chunhui WANG; Yuliang TAO

doi:10.3788/gzxb20215005.0514005

Journals >Acta Photonica Sinica >Volume 50 >Issue 5 >Page 102 > Article

Acta Photonica Sinica
Vol. 50, Issue 5, 102 (2021)

Wavelength Tuning Characteristics of Nd：YAG/Cr⁴⁺：YAG Laser Based on Volume Bragg Grating

Peibei MENG, Ming QI, Wei RONG, Menglong LI, Chunhui WANG, and Yuliang TAO

Author Affiliations

Key Laboratory for Space Laser Information Perception Technology of CAST， Beijing Institute of Space Mechanics & Electricity，Beijing100094， China

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DOI: 10.3788/gzxb20215005.0514005 Cite this Article

Peibei MENG, Ming QI, Wei RONG, Menglong LI, Chunhui WANG, Yuliang TAO. Wavelength Tuning Characteristics of Nd：YAG/Cr⁴⁺：YAG Laser Based on Volume Bragg Grating[J]. Acta Photonica Sinica, 2021, 50(5): 102 Copy Citation Text

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Fig. 1. Experimental setup and reflectivity curve

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Influence of VBG temperature on η0 and δλ

Fig. 2. Influence of VBG temperature on η₀ and δ_λ

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Fig. 3. VBG temperature-wavelength tuning curve

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Fig. 4. Spectrum simulating and spectrum test results

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Fig. 5. Relationship between laser wavelength and performance

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Fig. 6. Pulse trace and pulse set-up time

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Fig. 7. Relationship between pump power and performance

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Fig. 8. η₀ and δ_λ of VBG versus t_V

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Fig. 9. Influence of η₀ and δ_λ on laser performance

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Fig. 10. Laser performance

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Parameter	Value	Reference
Plank constant (h)	6.626×10^-34 J·s
Velocity of light (c)	3×10⁸ m/s
Pump wavelength (λ_p)	808 nm
Pump beam radius (ω_p)	0.185 mm
Pump frequency (f_p)	10 000 Hz
Pump duration (τ_p)	40 μs
Upper level lifetime of Nd:YAG (τ_f)	230 μs
Refractive index of Nd:YAG (n_c)	1.82
Length of Nd:YAG (l_c)	5 mm
Degeneracy factor (γ)	1
Coupling efficiency of spontaneous emission into lasing mode(κ)	1×10^-50
Absorption efficiency (η_a)	0.78(measured)
Pump quantum efficiency (η_Q)	0.95	[16]
Beam match efficiency (η_B)	0.95	[16]
Initial transmission of Cr⁴⁺:YAG (T₀)	0.68
Length of Cr⁴⁺:YAG (l_s)	1.95 mm
Cr⁴⁺:YAG absorption cross section of simulated state (σ_e)	2.2×10^-19 cm²	[16]
Cr⁴⁺:YAG absorption cross section of ground state (σ_g)	8.7×10^-19 cm²	[16]
Cr⁴⁺:YAG simulated state lifetime (τ_s)	3 μs
Refractive index of Cr⁴⁺:YAG (n_s)	1.82
Other cavity length (Δl)	1 mm
Cavity loss (δ_c)	0.01
Beam radius (ω_l)	0.15 mm
Refractive index of VBG@25℃(n_V)	1.486 7	[17]
VBG spatial frequency (f_V)	0.001 5 nm^-1	[18]
VBG central wavelength@25℃(λ₀)	1 064.18 nm
VBG central diffractive efficiency (η₀)	70%
VBG diffractive efficiency spectral width (δ_λ)	60 pm

Table 1. Parameters for simulating

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η₀	δ_λ/pm	P_p0/W	Wavelength tunable range/nm
70%	60	10.7	1 063.77~1 064.48
70%	60	9.5	1 063.81~1 064.29
70%	60	8.5	1 063.97~1 064.25
70%	60	7.5	1 064.10~1 064.23
65%	60	7.5	1 064.12~1 064.19
80%	60	7.5	1 063.98~1 064.26
70%	20	7.5	1 064.09~1 064.22
70%	100	7.5	1 064.09~1 064.24

Table 2. Wavelength tunable range (τ_p =40 μs)

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