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External-cavity lasers based on a volume holographic grating at normal incidence for spectroscopy in the visible range |
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| Authors: | T Hieta M Vainio C Moser |
| Institution: | a Helsinki University of Technology, Metrology Research Institute, Otakaari 5 A, P.O. Box 3000, FI-02015 TKK, Espoo, Finland b Centre for Metrology and Accreditation (MIKES), FI-02151, Finland c Frequency and Time Group, Institute for National Measurement Standards, National Research Council of Canada, 1200 Montreal Road, Ottawa, Ontario, Canada K1A 0R6 d Ondax Inc., Monrovia, CA 91016, USA |
| Abstract: | We present two external-cavity diode lasers that utilize a volume holographic grating as the frequency selective feedback element. By using the grating at normal incidence, it is possible to design simple and compact external-cavity diode lasers that have sufficient tunability for molecular spectroscopy. The first design utilizes a long-cavity designed for narrow linewidth and good long-term stability. The laser operates near 635 nm and it has a PZT-controlled tuning range of 28 GHz and a 1-s linewidth of 900 kHz. The second design utilizes a grating attached very close to the laser diode, making the laser compact, robust and easy to operate. The short external-cavity laser operates near 658 nm and it has a linewidth of 30 MHz. Continuous and mode-hop free tuning range of 145 GHz can be obtained by using a simple temperature tuning method. |
| Keywords: | External cavity laser Volume holographic grating Tunability Molecular spectroscopy |
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