Single Frequency LD-Pumped 2.09 μm Cr, Tm, Ho: YAG Microchip Laser

Abstract:

Single-frequency microchip lasers have been widely used in differential absorption radars, pulse coherent Doppler radars, pumping optical parametric oscillators, and etc. So theoretical analysis and experimental researches on the LD-pumped 2.09 μm microchip laser have important realistic meaning. According to quasi-three-level Cr, Tm, Ho: YAG(CTH:YAG) laser crystal working characteristics, the theoretical expression and relationship curve between the output optical power and 785nm LD-pumped power are obtained by theoretical calculating based on the pumping rate equation. The CTH:YAG crystal with 4mm diameter and 1 mm thickness is used to do experimental test. The corresponding three kinds of particle concentration are 0.85%, 5.9% and 0.36% respectively. When the crystal temperature is controlled at 10 °C, microchip laser beam output characteristic curve is obtained under different pump spots. The results show that when the pump spot diameter is 75um the maximum single-frequency output power is 32mW and when the pump beam is 100um the maximum single-frequency output power is 30mW. The corresponding optical to optical conversion slope efficiencies are 6.8% and 6% respectively.

• Periodical: Advanced Materials Research (Volumes 989-994)
• Pages: 356-359
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.989-994.356
• Online since: July 2014
• Authors: Yong Ming Nie*, Ya Kun Guo, Xin Ding, Min Min Guo
• Keywords: Laser, Laser Optics, Microchip Laser, Pumping

References

[1] J. J. Zayhowski, A. Mooradian. Single-frequency microchip Nd lasers [J], Opt. Lett., 1989 14(1) 24-26.

DOI: 10.1364/ol.14.000024

[2] L. E. Batay, A. A. Demidovich, A. N. Kuzmin, A. N. Titov, M. Mond, S. Kück. Efficient tunable laser operation of diode-pumped Yb, Tm: KY(WO4)2 around 1. 9μm [J], Appl. Phys. B, 2002 75(4-5): 457-461.

DOI: 10.1007/s00340-002-0998-1

[3] G. Galzerano, E. Sani, A. Toncelli, S. Taccheo, M. Tonelli, P. Laporta. Experimental investigation of the 2. 1µm single-mode Tm-Ho: KYF laser [J], Appl. Phys. B, 2004 78(6): 733-736.

DOI: 10.1007/s00340-004-1506-6

[4] D. Gatti, G. Galzerano, A. Toncelli, M. Tonelli, P. Laporta. Actively mode-locked Tm-Ho: LiYF4 and Tm-Ho: BaY2F8 lasers [J], Appl. Phys. B, 2007 86(2): 269-273.

DOI: 10.1007/s00340-006-2450-4

[5] C. P. Hale, J. W. Hobbs, P. Gatt. Broadly tunable master/local oscillator lasers for advanced laser radar applications [C], Proc. of SPIE, 2003 5086: 253-263.

DOI: 10.1117/12.488097

[6] J. Sotor, G. Dudzik, K. M. Abramski. Single frequency, monolithic Nd: YVO4/YVO4/KTP diode pumped solid state laser optimization by parasitic oscillations elimination [J], Opt. Comm., 2013 291: 279-284.

DOI: 10.1016/j.optcom.2012.11.023

[7] J. Z. Sotor, G. Dudzik, A. J. Antonczak, K.M. Abramski. Single-longitudinal mode, monolithic, green solid-state laser [J], Appl. Phys. B, 2011 103(1): 67-74.

DOI: 10.1007/s00340-010-4254-9

[8] Y. Ma, L. Wu, H. Wu, W. Chen, Y. Wang, S. Gu. Single-longitudinal mode Nd: YVO4 microchip laser with orthogonal-polarization bidirectional traveling-waves mode [J], Opt. Express, 2008 16(23): 18702-18713.

DOI: 10.1364/oe.16.018702

[9] P. Laporta, M. Marano, L. Pallaro, S. Taccheo. Amplitude and frequency stabilisation of a Tm–Ho: YAG laser for coherent radar applications at 2. 1μm [J], Optics and Lasers Engineering, 2002 37(5): 447-457.

DOI: 10.1016/s0143-8166(01)00086-0

[10] Z. Lin, C. Gao, M. Gao, Y. Zhang, H. Weber. Diode-pumped single-frequency microchip CTH: YAG lasers using different pump spot diameters [J], Appl. Phys. B, 2009 94(1): 81-84.

DOI: 10.1007/s00340-008-3303-0

[11] C. Svelto, I. Freitag, Room-temperature Tm: YAG ring laser with 150mW single-frequency output power at 2. 02 μm [J], Electronics Letters, 1999 35(2): 152-153.

DOI: 10.1049/el:19990097

[12] G. Rustad, K. Stenersen. Modeling of Laser-Pumped Tm and Ho Lasers Accounting for Up-conversion and Ground-State Depletion [J], IEEE J. Quantum Electron., 1996 32(9): 1645–1655.

DOI: 10.1109/3.535370