Title :
Frequency stabilization of 1.55 mu m DFB laser diode using vibrational-rotational absorption of /sup 13/C/sub 2/H/sub 2/ molecules
Author :
Sudo, Shoichi ; Sakai, Yoshihisa ; Yasaki, H. ; Ikegami, Tetsumo
Author_Institution :
NTT Opto-Electron. Lab., Kanagawa, Japan
Abstract :
The vibrational-rotational absorption of /sup 13/C/sub 2/H/sub 2/ molecules (VRAMs) in the 1.52-1.55 mu m region was investigated in detail. On the basis of this investigation, frequency stabilization of 1.55- mu m distributed-feedback (DFB) laser diodes was demonstrated. Frequency stability to within 2 MHz peak/peak fluctuation was achieved at the 1.54949- mu m wavelength. In addition, frequency stabilizations in the wavelength regions of 1.53 mu m and 1.54 mu m were also carried out by using the strong absorption lines of /sup 13/C/sub 2/H/sub 2/ VRAM in these wavelength regions. The spectral width of the frequency-stabilized DFB laser diode was found to be 25 MHz. The absolute frequency was found to be stabilized at least to within 25 MHz by the measurement of beat spectrum.<>
Keywords :
distributed feedback lasers; infrared spectra of organic molecules and substances; laser frequency stability; molecular rotation-vibration; organic compounds; semiconductor junction lasers; spectral line breadth; 1.52 to 1.55 micron; 1.54949 micron; absolute frequency; acetylene molecules; acetylene-/sup 13/C; beat spectrum; distributed feedback laser diodes; frequency stabilization; spectral width; strong absorption lines; vibrational-rotational absorption; Absorption; Atomic beams; Atomic measurements; Diode lasers; Fluctuations; Frequency; Nonlinear optics; Optical harmonic generation; Stability; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
