Research Progress of Blue-Green Single-Frequency Laser

Xiulin Peng; Changsheng Yang; Huaqiu Deng; Tianyi Tan; Xianchao Guan; Qilai Zhao; Zhouming Feng; Shanhui Xu

doi:10.3788/LOP57.071606

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 7 >Page 071606 > Article

Laser & Optoelectronics Progress
Vol. 57, Issue 7, 071606 (2020)

Research Progress of Blue-Green Single-Frequency Laser

Xiulin Peng^1、2, Changsheng Yang^2、3、*, Huaqiu Deng^1、2, Tianyi Tan^2、3, Xianchao Guan^1、2, Qilai Zhao^2、3, Zhouming Feng^2、3、4, and Shanhui Xu^{1、2、3、4}

Author Affiliations

¹School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510640, China

²State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong 510640, China

³Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangzhou, Guangdong 510640, China

⁴Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong 510640, China

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DOI: 10.3788/LOP57.071606 Cite this Article Set citation alerts

Xiulin Peng, Changsheng Yang, Huaqiu Deng, Tianyi Tan, Xianchao Guan, Qilai Zhao, Zhouming Feng, Shanhui Xu. Research Progress of Blue-Green Single-Frequency Laser[J]. Laser & Optoelectronics Progress, 2020, 57(7): 071606 Copy Citation Text

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Schematic diagram of three different SHG structures. (a) Single-pass of external cavity; (b) resonant enhancement of external cavity; (c) intracavity[21]

Fig. 1. Schematic diagram of three different SHG structures. (a) Single-pass of external cavity; (b) resonant enhancement of external cavity; (c) intracavity^[21]

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Fig. 2. Experimental setup of the intracavity SHG single-frequency Ti∶sapphire/PPKTP blue laser^[33]

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Fig. 3. Experimental setup of the diode-end pumped intracavity SHG single-frequency Nd∶YAG blue laser^[35]

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Fig. 4. Experimental setup of external resonator enhancement structure of 532 nm green single-frequency laser^[36]

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Fig. 5. Experimental setup for cascaded SHG of a tapered diode laser^[43]

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Fig. 6. Experimental setup of the multicrystal single-pass SHG^[46]

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Fig. 7. Experimental setup for single-pass SHG of 1064 nm single-frequency Yb³⁺-doped fiber laser^[47]

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Fig. 8. Measured SHG power and conversion efficiency versus fundamental power (Inset: SHG power versus square of the fundamental power)^[21]

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Fig. 9. Experiment setup of the ultra-compact all-fiber single-frequency blue laser^[22]

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Fig. 10. Experimental setup of InGaN blue single-frequency ECDL^[60]

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Fig. 11. Basic structure of GaN-based green laser diode^[61]

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Fig. 12. Experimental setup of the all-fiber blue laser amplifier^[66]

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Fig. 13. Measured output power of the 478 nm fiber amplifier as a function of the launched pump power (Upper left inset: optical spectra of the input and output of the fiber amplifier; lower right inset: single-frequency operation of the GaN diode laser confirmed with a scanning F-P interferometer)^[66]

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Parameter	Scheme
Parameter	SC	DC	MC
Crystal length /mm	30	60	90
Beam waist /μm	ω₁~30	ω₁~30, ω₂~46	ω₁~30, ω₂~46, ω₃~80
Oven configuration	OT	CT-OT	CT-CT-OT
Highest SHG conversion efficiency /%	32.7	54.8	56
Low power normalized SHGconversion efficiency /(%/W)	1.4	5	7.8
M² value	<1.29	<1.6	<1.6

Table 1. Summary of multicrystal single-pass SHG results^[46]

LDname	Thicknessof nCL /μm	Layer constituentand thickness of LWG
LD0LD1LD2LD3LD4LD5LD6LD7LD8LD9LD10LD11LD12	1 12 3 4 11111111	n-GaN: 120 nmn-In_0.05Ga_0.95N: 120 nmn-In_0.05Ga_0.95N: 120 nmn-In_0.05Ga_0.95N: 120 nmn-In_0.05Ga_0.95N: 120 nmn-In_0.05Ga_0.95N: 125 nmn-In_0.05Ga_0.95N: 130 nmn-In_0.05Ga_0.95N: 135 nmn-In_0.05Ga_0.95N: 140 nmn-In_0.05Ga_0.95N: 160 nmn-In_0.05Ga_0.95N: 240 nmn-GaN/In_0.1Ga_0.9N superlattice: 240 nmGraded n-In_xG $\begin{matrix} {a_{1 ⁃}}_{x} \end{matrix}$ N: 240nm

Table 2. Structural parameters of nCL and LWG in LD0-LD12^[61]

Item	Technologies of realizing blue-green single-frequency laser
		SHG			Directly lasing fromsemiconductor materials		Directly lasingfrom gain fiber
				Solid laser	Diode laser	Fiber laser
Type ofsource	Nd∶YAG laser, Ti∶sapphire laser, etc.		Tapered diode laser, etc.	Yb³⁺-doped fiber laser, Nd³⁺-doped fiber laser, etc.		InGaN-based LD, GaN-based LD, etc.	Pr³⁺/Yb³⁺/Tb³⁺-doped ZBLAN fiber laser, etc.
Wavelength	532 nm, 455 nm, etc.		531 nm, 515 nm, 447 nm, etc.	532 nm, 509 nm, 489 nm, etc.		520 nm, 518 nm, 445 nm, etc.	550 nm, 480 nm, 478 nm, etc.
Power	Hundreds of watts		Several watts	Tens of watts		Hundreds of milliwatts	Hundreds of milliwatts
Advantages	Large output power scale		Compact structure, reliable performance and low cost	High beam quality, small size and stable operation		Small size, low power consumption, reliable performance and easy to integrate	ZBLAN fiber amplifier can further improve the output power scale of blue-green single-frequency laser
Disadvan-tages	Complex structure, large size and poor power-stability		Limited Fundamental power scale	Limited Fundamental power scale		Limited output power scale	There are no report on the use of ZBLAN gain fiber to directly lasing blue-green single-frequency laser
Develop-menttrend	Towards more compactness on structure and higher power-stability		Further improve the output power scale of single-frequency diode laser sources	Further improve the output power scale of single-frequency fiber laser sources		Towards higher output power and beam quality	Use ZBLAN gain fiber to directly lasing blue-green single-frequency laser

Table 3. Summary of the realization of blue-green single frequency laser

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