Covesion SFG crystals for laser cooling and trapping
Covesion's range of MSFG crystals are most commonly used in quantum optics systems where narrow linewidth lasers are needed to access specific atomic transitions in order to manipulate and cool atoms and ions. Cooling lasers with Watt level powers are readily achievable by using high power fibre pump lasers for sum frequency generation in MgO:PPLN.
For example, the MSFG626 can be used for cooling Beryllium ions from two pump lasers at 1051nm and 1550nm which are then combined in the MSFG626, generating 626nm. This output is can then be frequency doubled to a 9Be+ ion transition at 313nm using a BBO crystal [1,2]. Similarly, our MSHG637 has been used to demonstrate cooling of Caesium atoms from 1560nm and 1077nm to 637nm, which is then frequency doubled to an atomic transition [3]. Our full range of MSFG crystals is shown below.
Part# | Pumps (nm) | Output (nm) | Grating periods (μm) | Lengths (mm) |
MSFG578 |
1030nm + 1280-1365nm | 570-587nm | 8.70, 8.80, 8.90, 9.00, 9.10 | 1, 3, 10, 20, 40 |
MSFG612 | 1550nm + 1000-1025nm | 608-617nm | 10.40, 10.55, 10.70, 10.85, 11.00 | 1, 3, 10, 20, 40 |
MSFG626 | 1051nm +1550-1560nm | 618-628nm | 11.12, 11.17, 11.22 | 1, 3, 10, 20, 40 |
MSFG637 | 1070nm + 1520-1590nm | 628-640nm | 11.60, 11.65, 11.70, 11.75, 11.80 | 1, 3, 10, 20, 40 |
MSFG647 | 1550nm + 1085-1160nm | 638-663nm | 12.10, 12.30, 12.50, 12.70, 12.90 | 1, 3, 10, 20, 40 |
To achieve efficient SFG, you ideally want the two pump beams to be confocally focussed into the PPLN (i.e. ratio of the crystal length to the confocal parameter is 1) and for both beams to be roughly equal in power. Note that for high power beams, a looser focus is recommended, avoiding back-conversion or crystal damage.
For generation of 626nm light from 1051nm and 1551nm, efficiencies of 3.5-2.5%/Wcm have been achieved [1,2]. Here, the efficiency η, is defined by
Where P is the power at each wavelength, and l is the crystal length. Lo et al. demonstrated an efficiency of 44% for the generation of 7.2W of 626nm light from 1051nm (8.5W) and 1551nm (8.3W) [1]. Here they used a 40mm long, 0.5mm thick crystal at 180C with a 58μm spot size (1/e2 radius). Further examples and technical details are summarised in the table below of some selected publications.
Part#: Nonlinear process |
Crystal Conditions | Summary | Reference |
MSFG626-0.5-40: 1051nm + 1550nm → 626nm CW |
|
|
Wilson et al., Appl. Phys. B, vol. 105, no. 4, pp. 741–748, 2011. [link] |
MSFG626-0.5-40: 1051 nm + 1550 nm → 626nm, CW |
|
|
Schwarz et al., Rev. Sci. Instrum., vol. 83, no. 8, p. 83115, 2012. [link] |
MSFG626-0.5-40: 1050.98 nm + 1551.44 nm -> 626.54nm CW |
|
|
Lo et al., Appl. Phys. B Lasers Opt., vol. 114, no. 1–2, pp. 17–25, 2014. [link] |
MSFG637-0.5-40: 1560.5 nm + 1076.9→ 637.2 nm , CW |
|
|
Wang et al., Opt. Commun., vol. 370, pp. 150–155, 2016. [link] |
MSFG647-0.5-40: 1085.5 nm + 1557.3 nm→ 639.6 nm , CW |
|
|
Rengelink et al., Appl. Phys. B, vol. 122, no. 5, p. 122, 2016. [link] |
References
[1] H.-Y. Lo et al., Applied Physics B, doi:10.1007/s00340-013-5605-0, (2013)
[2] A. C. Wilson et al., Applied Physics B, vol. 105, no. 4, pp. 741 – 748, (2011)
[3] J. Wang et al., Optics Communications, vol. 370, pp. 150–155, (2016)
Tags
Latest news
-
QT Assemble: Covesion play integral part in exciting quantum technologies collaboration
- September 24, 2020 -
Ground-Breaking Quantum Research
- June 04, 2020 -
NEW! PPLN Waveguides
- June 21, 2019 -
LASER World of Photonics 2019
- April 30, 2019 -
SPIE BIOS 2019
- November 12, 2018
News archives
- September 2020 (1)
- June 2020 (1)
- June 2019 (1)
- April 2019 (1)
- November 2018 (2)
- December 2017 (2)
- August 2017 (1)
- May 2017 (1)
- April 2017 (3)
- January 2017 (1)
- November 2016 (1)
- December 2015 (1)
Latest news
-
QT Assemble: Covesion play integral part in exciting quantum technologies collaboration
- September 24, 2020 -
Ground-Breaking Quantum Research
- June 04, 2020 -
NEW! PPLN Waveguides
- June 21, 2019 -
LASER World of Photonics 2019
- April 30, 2019 -
SPIE BIOS 2019
- November 12, 2018
News archives
- September 2020 (1)
- June 2020 (1)
- June 2019 (1)
- April 2019 (1)
- November 2018 (2)
- December 2017 (2)
- August 2017 (1)
- May 2017 (1)
- April 2017 (3)
- January 2017 (1)
- November 2016 (1)
- December 2015 (1)
Contact
For all initial enquiries please contact our team at:
Covesion Ltd
Unit A7, Premier Centre
Premier Way, Romsey
Hampshire SO51 9DG
United Kingdom
Email: sales@covesion.com
Tel. +44 (0)1794 521638
Fax. +44 (0)8709 289714